CN112243846A - Accurate water and fertilizer content supply system in crop sand culture medium and control method - Google Patents

Accurate water and fertilizer content supply system in crop sand culture medium and control method Download PDF

Info

Publication number
CN112243846A
CN112243846A CN202011206421.1A CN202011206421A CN112243846A CN 112243846 A CN112243846 A CN 112243846A CN 202011206421 A CN202011206421 A CN 202011206421A CN 112243846 A CN112243846 A CN 112243846A
Authority
CN
China
Prior art keywords
fertilizer
water
liquid
sand culture
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011206421.1A
Other languages
Chinese (zh)
Inventor
梁斌
徐宝刚
徐连法
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weifang Huijinhai Internet Of Things Technology Co ltd
Shandong Huijinhai Intelligent Agricultural Research Institute Co ltd
Qingdao Agricultural University
Original Assignee
Weifang Huijinhai Internet Of Things Technology Co ltd
Shandong Huijinhai Intelligent Agricultural Research Institute Co ltd
Qingdao Agricultural University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weifang Huijinhai Internet Of Things Technology Co ltd, Shandong Huijinhai Intelligent Agricultural Research Institute Co ltd, Qingdao Agricultural University filed Critical Weifang Huijinhai Internet Of Things Technology Co ltd
Priority to CN202011206421.1A priority Critical patent/CN112243846A/en
Publication of CN112243846A publication Critical patent/CN112243846A/en
Pending legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G31/00Soilless cultivation, e.g. hydroponics
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C23/00Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
    • A01C23/007Metering or regulating systems
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01CPLANTING; SOWING; FERTILISING
    • A01C23/00Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
    • A01C23/04Distributing under pressure; Distributing mud; Adaptation of watering systems for fertilising-liquids
    • A01C23/042Adding fertiliser to watering systems
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G31/00Soilless cultivation, e.g. hydroponics
    • A01G31/02Special apparatus therefor
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G31/00Soilless cultivation, e.g. hydroponics
    • A01G2031/006Soilless cultivation, e.g. hydroponics with means for recycling the nutritive solution
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/21Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

Abstract

The invention discloses a system and a control method for accurately supplying water and fertilizer content in a crop sand culture medium, wherein the system comprises: the device comprises a fertilization header pipe, wherein an online automatic fertilizer preparation module for online proportioning nitrogen, phosphorus and potassium water fertilizers is connected to the fertilization header pipe, the water fertilizers in the fertilization header pipe are conveyed into a sand culture substrate, a liquid return tank is arranged on one side of the sand culture substrate, a flow guide device for guiding redundant water fertilizers in the sand culture substrate to the liquid return tank is pre-buried in the sand culture substrate, an in-situ detection module for performing in-situ online analysis on the water fertilizers returning to the liquid return tank in the sand culture substrate is arranged on one side of the liquid return tank, and the in-situ detection module and the online automatic fertilizer preparation module are automatically controlled by a platform control system.

Description

Accurate water and fertilizer content supply system in crop sand culture medium and control method
Technical Field
The invention relates to a water and fertilizer content accurate supply system, in particular to a water and fertilizer content accurate supply system in a crop sand culture medium and a control method, wherein the water and fertilizer content accurate supply system is simple in structure and suitable for accurately supplying the content of nitrogen, phosphorus and potassium elements in water and fertilizer in the sand culture medium, and belongs to the technical field of crop fertilization.
Background
In agricultural production, the substrates for planting crops comprise a soil culture substrate and a sand culture substrate, and when the crops are planted by adopting the sand culture substrate in the prior art, in order to improve the production quality of the crops, liquid water fertilizer needs to be poured into the sand culture substrate to improve the content of nutrients in the sand culture substrate, so that the production quality of the crops is ensured and improved.
The retention time of the liquid manure in the sand culture medium is short, so that the liquid manure needs to be applied regularly at multiple frequencies and high frequency to improve the content of the liquid manure in the culture medium.
In the prior art, for applying water and fertilizer to crop cultivation substrates conveniently, a fertilizer application system is mostly adopted for applying fertilizer, and the fertilizer application system has the following patent numbers: 201910186876.2 discloses a precision fertilization system. This fertilization system includes: the device comprises a sample injection device, a nutrient detection device, a control device and a fertilizing device; the sample injection device, the nutrient detection device and the fertilizing device are all connected with the control device; the sample introduction device is used for absorbing sample introduction liquid and carrying out reaction; the sample injection liquid comprises a nitrogen reagent, a phosphorus reagent, a potassium reagent, a nutrient solution and a diluent; the nutrient detection device is connected with the sample injection device and is used for carrying out color comparison on the reaction liquid to obtain absorbance; the control device is used for controlling the inflow of the sample feeding liquid in the sample feeding device and the adjustment of the wavelength of a light source in the nutrient detection device, calculating the content of fertilizer in the sample feeding liquid according to the absorbance meter and sending a fertilizing signal to the fertilizing device according to the content of the fertilizer; the fertilizing device applies fertilizer according to the fertilizer signal.
Above-mentioned accurate fertilization system of this kind is applicable to and fertilizes to the soil matrix, is not applicable to and fertilizes to the sand matrix, because, the persistence time of liquid manure is short in the sand matrix, and liquid manure is executed the volume of watering and is difficult to control, and when liquid manure executed the volume of watering too big, the sand can be washed away to unnecessary liquid manure, causes the sand and soil loss serious, destroys the growing environment of crops on the sand matrix to liquid manure is extravagant serious, improves manufacturing cost greatly, reduces peasant economic benefits.
And the accurate fertilization system can not accurately detect the content of nitrogen, phosphorus and potassium nutrients in the water manure of the sand culture medium, so that the practicability is reduced, the content of each nutrient in the sand culture medium can not be visually reflected, and accurate fertilization can not be realized.
Disclosure of Invention
The invention aims to provide a system and a method for accurately supplying the content of water and fertilizer in a crop sand culture matrix, which have simple structure and are suitable for accurately supplying the content of nitrogen, phosphorus and potassium elements in the water and fertilizer in the sand culture matrix.
In order to solve the technical problems, the invention provides the following technical scheme:
accurate replenishment system of liquid manure content in crops sand culture matrix includes: the device comprises a fertilization header pipe, wherein an online automatic fertilizer preparation module for preparing nitrogen, phosphorus and potassium water fertilizers online is connected to the fertilization header pipe, the water fertilizers in the fertilization header pipe are conveyed into a sand culture substrate, a liquid return tank is arranged on one side of the sand culture substrate, a flow guide device for guiding surplus water fertilizers in the sand culture substrate to the liquid return tank is pre-buried in the sand culture substrate, an in-situ detection module for carrying out in-situ online analysis on the water fertilizers flowing back into the liquid return tank in the sand culture substrate is arranged on one side of the liquid return tank, and the in-situ detection module and the online automatic fertilizer preparation module are automatically controlled by a platform control system.
The following is a further optimization of the above technical solution of the present invention:
the online automatic fertilizer preparation module comprises a nitrogen fertilizer barrel, a potassium fertilizer barrel, a phosphate fertilizer barrel and a trace element barrel, wherein the nitrogen fertilizer barrel, the potassium fertilizer barrel, the phosphate fertilizer barrel, the trace element barrel and a fertilization header pipe are respectively communicated through corresponding water and fertilizer pipes, and a first electromagnetic flowmeter, a first electromagnetic valve, a fertilizer suction pump and a flowmeter are sequentially arranged on the water and fertilizer pipes.
Further optimization: the flow guiding device comprises a flow guiding box, a flow guiding channel is arranged in the flow guiding box, a liquid inlet communicated with the flow guiding channel is arranged above the flow guiding box, a filtering permeable layer is arranged at the position, located at the liquid inlet, above the flow guiding box, and a return pipe is arranged between the flow guiding box and the liquid returning pool.
Further optimization: be provided with in the liquid-returning pool and be used for carrying out the liquid level detector that detects to the liquid manure liquid level of storing in the liquid-returning pool, be provided with out fertile pipe between liquid-returning pool and the fertilization house steward, the feed liquor end that goes out fertile pipe is located liquid-returning pool and the intercommunication has the circulating pump, goes out the liquid end and the fertilization house steward intercommunication of fertile pipe.
Further optimization: the platform control system comprises a liquid manure control platform and a main controller, and the liquid manure control platform is electrically connected with the main controller;
the first electromagnetic flow meter, the first electromagnetic valve and the fertilizer suction pump corresponding to each barrel of the on-line automatic fertilizer distribution module are respectively and electrically connected with the main controller.
Further optimization: the second electromagnetic flowmeter and the main pipeline electromagnetic valve are respectively and electrically connected with the water and fertilizer control platform;
the output end of the in-situ detection module is connected with the water and fertilizer control platform, and the contents of nitrogen, phosphorus and potassium nutrients in the water and fertilizer detected by the in-situ detection module are sent to the water and fertilizer control platform at any moment;
the liquid level detector is electrically connected with the liquid fertilizer control platform, and the liquid level of the liquid fertilizer in the liquid returning pool detected by the liquid level detector is constantly sent to the liquid fertilizer control platform;
the liquid manure management and control platform is connected with greenhouse environment detection module, and greenhouse environment detection module is used for detecting the interior ambient temperature of canopy, illumination intensity, humidity and the water content in the sand culture matrix constantly.
Further optimization: the water and fertilizer control platform is internally stored with preset thresholds of the content of nitrogen, phosphorus and potassium nutrients of corresponding growth stages according to the growth stages of crops;
an upper liquid level set value and a lower liquid level set value of the liquid returning pool, an illumination intensity set value and a sand culture substrate water content set value are also arranged in the liquid manure control platform.
By adopting the technical scheme, the invention has the advantages of ingenious conception and reasonable structure, can collect the water manure in the sand culture medium, can carry out in-situ on-line analysis and detection on the content of the nutrients such as nitrogen, phosphorus, potassium and the like in the collected water manure, can visually reflect the concentration of each nutrient in the sand culture medium, has accurate detection data, can carry out accurate fertilizer preparation on the sand culture medium according to the detection data, is automatically completed for convenient use, can further carry out accurate fertilizer application on the sand culture medium, ensures that the nutrient environment of the sand culture medium accords with the growth of crops, and has stable work of the whole structure, simple structure and convenient use.
The invention also discloses a method for accurately supplying and controlling the water and fertilizer content in the crop sand culture medium, which is based on the system for accurately supplying the water and fertilizer content in the crop sand culture medium; the method comprises the following steps:
s1, setting the volume a of irrigation water each time, and setting nutrient elements according to the volume a of the irrigation water each time;
s2, judging whether the sand culture substrate needs to be watered with water and fertilizer, if the greenhouse environment detection module detects that the water content in the sand culture substrate is larger than a set water content value, no action is performed, and if the water content in the sand culture substrate is smaller than the set water content value, performing S3;
s3, judging whether the environment in the shed accords with watering, detecting by a greenhouse environment detection module to obtain that no action is performed when the illumination intensity is smaller than an illumination intensity set value, and performing S4 when the illumination intensity in the shed is larger than the illumination intensity set value;
s4, comparing the liquid level in the liquid returning pool detected by the liquid level detector with the upper liquid level set value by the liquid level control platform, and performing the step S5 when the liquid level in the liquid returning pool is less than the upper liquid level set value;
s5, the water and fertilizer control platform controls the opening of a main pipeline electromagnetic valve on the fertilization main pipe, so that the fertilization main pipe can irrigate water and fertilizer to the sand culture substrate.
The following is a further optimization of the above technical solution of the present invention:
the method further comprises the following steps:
s6, judging whether the contents of nitrogen, phosphorus and potassium in the water fertilizer of the sand culture substrate are smaller than the preset threshold values of the corresponding contents of nitrogen, phosphorus and potassium by the in-situ detection module, and outputting the corresponding nitrogen, phosphorus and potassium fertilizers by the corresponding nitrogen fertilizer barrel, phosphorus fertilizer barrel and potassium fertilizer barrel; entering step S7 when the content of nitrogen, phosphorus and potassium in the water fertilizer of the sand culture substrate is larger than the preset threshold value of the corresponding content of nitrogen, phosphorus and potassium;
s7, repeating the step S5 when the liquid level height of the liquid manure in the liquid returning pool is judged to be smaller than the upper liquid level set value, and entering the step S8 when the liquid level height of the liquid manure in the liquid returning pool is judged to be larger than the set value;
and S8, closing the electromagnetic valve of the main pipeline of the fertilization main pipe and closing all fertilization.
Further optimization: in step S4, when the liquid level in the liquid return tank is greater than the upper liquid level set value, a circulating pump is started to irrigate the sand culture substrate by using the liquid fertilizer in the liquid return tank;
and judging the liquid level of the liquid manure in the reflux pool, stopping the circulating pump when the liquid level of the liquid manure in the reflux pool is less than the upper liquid level set value, and stopping the circulating pump when the liquid level of the liquid manure in the reflux pool is less than the single irrigation total amount.
By adopting the technical scheme, the invention has ingenious conception, can accurately detect the water and fertilizer content in the sand culture medium, and can quantitatively supply water and fertilizer to the sand culture medium according to the detection result, so that the nutrient environment in the sand culture medium is in accordance with the nutrient environment required by each growth stage of crops, the growth environment safety of agricultural products can be further ensured, and the crops can thrive.
The invention is further illustrated with reference to the following figures and examples.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a pod cartridge in an embodiment of the invention;
FIG. 3 is a general schematic diagram of an in-situ detection module in an embodiment of the invention;
FIG. 4 is a schematic illustration of a sample transmission cuvette in an embodiment of the invention;
FIG. 5 is a schematic diagram of the connection of a first peristaltic pump in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the connection of a second peristaltic pump in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a platform control system in an embodiment of the present invention;
FIG. 8 is a schematic diagram of a platform control system in an embodiment of the invention.
In the figure: 1-sand culture medium; 2-a liquid returning pool; 21-a liquid level detector; 3-fertilization of the header pipe; 31-fertilization branch pipes; 32-a first filter; 33-a second electromagnetic flow meter; 34-main line solenoid valve; 35-a first one-way valve; 4-on-line automatic fertilizer preparation module; 41-nitrogen fertilizer barrel; 42-a potash fertilizer barrel; 43-phosphate fertilizer barrel; 44-microelement tank; 45-a first electromagnetic flow meter; 46-a first solenoid valve; 47-fertilizer suction pump; 48-a flow meter; 49-a water fertilizer pipe; 5-a flow guide device; 51-a diversion box; 52-a flow guide channel; 53-liquid inlet; 54-filtration permeate layer; 55-a return pipe; 6-an in-situ detection module; 601-a laser light source; 602-a multimode laser splitter; 603-a first collimating mirror; 604-a second collimating mirror; 605-reference photodetector; 606-sample photodetector; 607-reference transmission cuvette; 608-sample transmission cuvette; 609-quartz fiber; 610-an optical fiber; 613-first peristaltic pump; 614-a second peristaltic pump; 615-liquid inlet pipe; 616-a liquid outlet pipe; 617-measuring a reference light source circuit; 618-assay sample light source circuit; 619 — reference cuvette; 7-a platform control system; 71-a liquid manure control platform; 72-a master controller; 8-fertilizer discharging pipe; 81-circulating pump; 82-a second filter; 83-a second one-way valve; 9-greenhouse environment detection module.
Detailed Description
Example (b): as shown in fig. 1-3, the system for accurately supplying water and fertilizer content in crop sand culture medium comprises: the device comprises a fertilization header pipe 3, wherein an online automatic fertilizer preparation module 4 for proportioning nitrogen, phosphorus and potassium water fertilizers online is connected to the fertilization header pipe 3, the water fertilizers in the fertilization header pipe 3 are conveyed into a sand culture substrate 1, a liquid return tank 2 is arranged on one side of the sand culture substrate 1, a flow guide device 5 for guiding redundant water fertilizers in the sand culture substrate 1 to the liquid return tank 2 is pre-embedded in the sand culture substrate 1, an in-situ detection module 6 for carrying out in-situ online analysis on the water fertilizers flowing back into the liquid return tank 2 in the sand culture substrate 1 is arranged on one side of the liquid return tank 2, and the in-situ detection module 6 and the online automatic fertilizer preparation module 4 are automatically controlled by a platform control system 7.
One end of the fertilization header pipe 3 is communicated with a water source through a water delivery pump, the other end of the fertilization header pipe 3 is communicated with a plurality of fertilization branch pipes 31, the fertilization branch pipes 31 are arranged in the sand culture substrate 1, and the fertilization branch pipes 31 are used for fertilizing the sand culture substrate 1 in a drip irrigation mode.
The online automatic fertilizer preparation module 4 comprises a nitrogen fertilizer barrel 41, a potassium fertilizer barrel 42, a phosphate fertilizer barrel 43 and a trace element barrel 44 which are sequentially arranged, the nitrogen fertilizer barrel 41, the potassium fertilizer barrel 42, the phosphate fertilizer barrel 43, the trace element barrel 44 and the fertilization header pipe 3 are respectively communicated through corresponding water and fertilizer pipes 49, and a first electromagnetic flowmeter 45, a first electromagnetic valve 46, a fertilizer suction pump 47 and a flowmeter 48 are sequentially arranged on the water and fertilizer pipes 49.
The first electromagnetic valve 46 is used for controlling the on-off of the water fertilizer pipe 49 between the corresponding nitrogen fertilizer barrel 41, potassium fertilizer barrel 42, phosphate fertilizer barrel 43, microelement barrel 44 and fertilization header pipe 3.
The first electromagnetic flowmeter 45 is used for detecting the volume of liquid medicine circulating in a water fertilizer pipe 49 between the nitrogen fertilizer barrel 41, the potassium fertilizer barrel 42, the phosphate fertilizer barrel 43, the trace element barrel 44 and the fertilization header pipe 3.
The fertilizer suction pump 47 is used for providing power, conveying water fertilizers in the corresponding nitrogen fertilizer barrel 41, potassium fertilizer barrel 42, phosphate fertilizer barrel 43 and trace element barrel 44 into the fertilization header pipe 3 through the water fertilizer pipe 49 to be mixed with the water in the fertilization header pipe 3, and enabling the water fertilizers to enter the sand culture substrate 1 along with the water flowing in the fertilization header pipe 3 to irrigate the sand culture substrate 1.
When the first electromagnetic flow meter 45 detects that the volume of the liquid medicine flowing through the fertilizer pipe 49 reaches a set threshold value, the first electromagnetic valve 46 is closed.
The fertilization main pipe 3 is communicated with a first filter 32, a second electromagnetic flowmeter 33, a main pipeline electromagnetic valve 34 and a first one-way valve 35 in sequence at a position close to the fertilization branch pipe 31.
The first filter 32 is used for filtering the water and fertilizer circulating in the fertilization main pipe 3.
And the second electromagnetic flow meter 33 is used for metering the water and fertilizer circulating in the fertilization main pipe 3, so that the volume of the water and fertilizer circulating in the fertilization main pipe 3 is detected.
The main pipeline electromagnetic valve 34 is used for controlling the on-off of the fertilization main pipe 3, and further controlling whether the fertilization main pipe 3 outputs water and fertilizer.
When the second electromagnetic flowmeter 33 detects that the volume of the water and the fertilizer circulating in the fertilization main pipe 3 reaches a set threshold value, the first electromagnetic valve 46 is closed.
The first check valve 35 is used for controlling the flow direction of the water and fertilizer in the fertilization header pipe 3, and the water and fertilizer in the fertilization header pipe 3 is prevented from flowing back to pollute a water source.
When the first electromagnetic flowmeter 45 detects that the volume of the liquid medicine flowing through the fertilizer pipe 49 reaches a set threshold value, the main pipeline electromagnetic valve 34 is closed.
The flow guide devices 5 comprise a plurality of flow guide devices 5, the flow guide devices 5 are sequentially arranged at intervals along the width direction of the sand culture substrate 1, and each flow guide device 5 is arranged along the length direction of the sand culture substrate 1.
Due to the characteristics of the sand culture substrate 1, the water storage performance of the sand culture substrate 1 is poor, and when too much water and fertilizer is poured, sand and soil loss is easy to occur, the growth environment of crops on the sand culture substrate 1 is damaged, and the waste of the water and fertilizer is caused.
The guide device 5 pre-buried in the sand culture substrate 1 can guide the excessive water and fertilizer in the sand culture substrate 1, so that the excessive water and fertilizer in the sand culture substrate 1 is guided to the liquid return tank 2 through the guide device 5.
When water and fertilizer are poured into the sand culture substrate 1, the water and fertilizer slowly permeate into the sand culture substrate 1 to enable the sand culture substrate 1 to be in a saturated state, at the moment, the excess water and fertilizer in the sand culture substrate 1 permeates into the flow guide device 5 through the permeation principle, and then the flow guide device 5 guides the water and fertilizer to enable the water and fertilizer to enter the liquid return pool 2.
As shown in fig. 1-2, the flow guiding device 5 includes a flow guiding box 51, a flow guiding channel 52 is disposed in the flow guiding box 51, and a liquid inlet 53 communicated with the flow guiding channel 52 is disposed above the flow guiding box 51.
A filtering and permeating layer 54 for filtering the sediment of the sand culture substrate 1 is arranged above the diversion box 51 at the position of the liquid inlet 53.
Filter permeable formation 54 and set up the inlet 53 department at water conservancy diversion box 51, filter permeable formation 54 and can filter sand culture matrix 1's silt, block silt in water conservancy diversion box 51's outside, avoid sand and soil loss serious, let in the sand culture matrix 1 unnecessary liquid manure permeate to water conservancy diversion box 51 in through filtering permeable formation 54, facilitate the use.
The filtration permeation layer 54 is a non-woven fabric layer, and the overall thickness of the filtration permeation layer 54 is 40-80 mm.
A return pipe 55 is arranged at one end of the diversion box 51, one end of the return pipe 55 is communicated with the diversion channel 52 of the diversion box 51, and the other end of the return pipe 55 is communicated with the liquid return tank 2.
The redundant water manure in the sand culture substrate 1 permeates into the diversion channel 52 of the diversion box 51 through the permeation principle and the filtration of the filtration permeation layer 54, the diversion channel 52 is used for guiding the water manure to enter the return pipe 55, and then the return pipe 55 conveys the water manure to the liquid returning pool 2.
The back flow 55 between diversion box 51 and the liquid return tank 2 is established ties and is had the filter, the filter is used for filtering the liquid manure liquid of carrying in the back flow 55, avoids silt to get into in the liquid return tank 2 through the back flow 55, and then improves the quality of backward flow liquid manure.
As shown in fig. 1, a liquid level detector 21 for detecting the liquid level of the liquid manure stored in the liquid returning pool 2 is arranged in the liquid returning pool 2.
The liquid level detector 21 is used for constantly detecting the liquid level of the liquid manure stored in the liquid return pool 2, and the liquid level is prevented from being too low or too high.
Return to and be provided with out fertile pipe 8 between liquid pond 2 and the fertilization house steward 3, the feed liquor end intercommunication that goes out fertile pipe 8 has circulating pump 81, circulating pump 81 sets up in returning liquid pond 2, the play liquid end and the fertilization house steward 3 intercommunication of going out fertile pipe 8.
Design like this, circulating pump 81 work can be used to absorb the liquid manure in the liquid return pool 2 then, then carry to fertilization house steward 3 in through going out fertile pipe 8, realize adopting the liquid manure in the liquid return pool 2 to fertilize matrix 1, improve the utilization ratio of liquid manure in the liquid return pool 2, avoid the extravagant serious of liquid manure.
A second filter 82 and a second one-way valve 83 are connected in series on the fertilizer outlet pipe 8 from the circulating pump 81 to one side of the fertilization main pipe 3 in sequence.
The second filter 82 is used for filtering the water and fertilizer circulating in the fertilizer outlet pipe 8, so that the quality of the water and fertilizer is improved.
The second check valve 83 is used for controlling the flow direction of the water and fertilizer in the fertilizer outlet pipe 8 and preventing the water and fertilizer in the fertilization header pipe 3 from entering the liquid return pool 2 through the fertilizer outlet pipe 8.
As shown in fig. 1 and fig. 3 to 6, the in-situ detection module 6 includes a laser light source 601, the laser light source 601 is configured to emit laser with a specific wavelength to detect and analyze the content of nitrogen, phosphorus, and potassium in the liquid manure that flows back in the liquid returning pool 2, and the liquid manure in the liquid returning pool 2 is conveyed to a detection position of the in-situ detection module 6 through a continuous sampling system.
The laser light source 601 is connected with a multimode laser splitter 602 through a quartz fiber 609, two light source lines are installed on the multimode laser splitter 602, and the two light source lines respectively comprise a measurement reference light source line 617 and a measurement sample light source line 618.
The laser source 601 can emit laser with a specific wavelength, the laser is transmitted to the multimode laser splitter 602 through the quartz fiber 609, the multimode laser splitter 602 splits the laser with the specific wavelength emitted by the laser source 601 into two parts, and the intensity of the laser with the specific wavelength is weakened but the wavelength is unchanged after splitting.
The quartz optical fiber 609 can be used for guiding and transmitting laser emitted by the laser source 601, so that the laser source 601 and the multimode laser splitter 602 are conveniently arranged, and the use is convenient.
The two laser beams with specific wavelength split by the multimode laser splitter 602 are a measurement reference laser beam and a measurement sample laser beam, respectively.
The measurement reference laser beam is transmitted along the measurement reference light source line 617, and the measurement reference laser beam is used for detecting and analyzing the absorbance of the reference sample on the measurement reference light source line 617.
The measurement sample laser beam is transmitted along the measurement sample light source line 618, and the measurement sample laser beam is used for detecting, analyzing and measuring the absorbance of the measurement sample on the measurement sample light source line 618, and further used for detecting, analyzing and measuring the content of nutrients in the sample.
The laser light source 601 is a laser emitting device with adjustable power, and the power of the laser emitting device can be adjusted to adjust the laser power emitted by the laser light source 601.
The laser source 601 is a conventional laser source, and can be purchased directly from the market.
The measurement reference light source circuit 617 includes a first collimating mirror 603, a reference photodetector 605 is disposed at an interval on one side of the first collimating mirror 603, and a reference transmission cuvette 607 is disposed at an interval between the first collimating mirror 603 and the reference photodetector 605.
The first collimating mirror 603 and the reference photodetector 605 are arranged in parallel, and a light beam focusing point of the first collimating mirror 603 and a detection point of the reference photodetector 605 are located on the same straight line.
The first collimating mirror 603 is used to focus and adjust the position of the measurement reference laser beam transmitted on the measurement reference light source line 617.
The light source circuit 618 for measuring the sample comprises a second collimating mirror 604, a sample photodetector 606 is arranged at one side of the second collimating mirror 604 at intervals, and a sample transmission cuvette 608 is arranged between the second collimating mirror 604 and the sample photodetector 606 at intervals.
The second collimating mirror 604 and the sample photodetector 606 are arranged in parallel, and a light beam condensing point of the second collimating mirror 604 and a detection point of the sample photodetector 606 are located on the same straight line.
The second collimator 604 is used to condense and adjust the position of the measurement sample laser beam transmitted on the measurement sample light source line 618.
By the design, when the content of nutrients in a sample needs to be measured, firstly, the continuous sample feeding system respectively inputs reference samples into the reference transmission cuvette 607; the continuous sample introduction system introduces the assay sample into the sample transmission cuvette 608.
Then, laser emitted by the laser source 601 is divided into a measurement reference laser beam and a measurement sample laser beam by the multimode laser splitter 602, the measurement reference laser beam is transmitted along the measurement reference light source line 617, the measurement reference laser beam is collected by the first collimating mirror 603 and then transmitted through the reference transmission cuvette 607 containing a reference sample, the measurement reference laser beam is imaged on a detection point of the reference photodetector 605, and the reference photodetector 605 is used for detecting the absorbance at this time, so as to obtain the reference absorbance.
The measurement sample laser beam is transmitted along the measurement sample light source line 618, and then the measurement sample laser beam is collected by the second collimating mirror 604, transmitted through the sample transmission cuvette 608 containing the measurement sample, and then the light of the measurement sample laser beam transmitted through the sample transmission cuvette 608 is absorbed by atoms in the sample transmission cuvette 608, and the measurement sample laser beam is imaged on a detection point of the sample photodetector 606, and then the sample photodetector 606 is used for detecting the absorbance of the measurement sample, and then the absorbance of the measurement sample is obtained.
And then through the formula: and (3) determining the absorbance of the sample, namely the reference absorbance = the actual absorbance of the sample, and then obtaining the actual absorbance of the sample, wherein the content of the nutrient in the determined sample to be determined can be accurately calculated through the actual absorbance of the sample.
Optical fibers 610 are respectively arranged between the multimode laser splitter 602 and the first collimating mirror 603 and the second collimating mirror 604, and the measurement reference laser beam and the measurement sample laser beam split by the multimode laser splitter 602 are respectively transmitted to the corresponding first collimating mirror 603 and the second collimating mirror 604 through the optical fibers 610.
The optical fiber 610 is used for guiding and transmitting the measurement reference laser beam and the measurement sample laser beam which are split by the multimode laser splitter 602, so that the transmission of the measurement reference laser beam and the measurement sample laser beam is facilitated, and the use is facilitated.
The number of the laser light sources 601 is three, and the three laser light sources 601 include a nitrogen element detection laser light source, a phosphorus element detection laser light source, and a potassium element detection laser light source.
The nitrogen element detection laser light source is used for detecting, analyzing and determining the content of nitrogen elements in a sample, and the wavelength absorbed by the nitrogen elements is as follows: 210 nm and 230nm, and the wavelength of the nitrogen element detection laser light source is preferably 217 nm.
The phosphorus element detection laser light source is used for detecting, analyzing and determining the content of phosphorus elements in a sample, and the wavelength absorbed by the phosphorus elements is as follows: 460 ℃ and 490nm, the wavelength of the phosphorus element detection laser light source is preferably 490 nm.
The potassium element detection laser light source is used for detecting, analyzing and determining the content of potassium element in a sample, and the wavelength absorbed by the potassium element is as follows: 420-450nm, and the wavelength of the potassium element detection laser light source is preferably 440 nm.
The overall shape and specification of the reference transmission cuvette 607 and the sample transmission cuvette 608 are the same, and the reference transmission cuvette 607 and the sample transmission cuvette 608 are made of transparent glass, and the overall wall thickness of the reference transmission cuvette 607 and the sample transmission cuvette 608 is 2-5 mm.
All be provided with the stock solution cavity in reference transmission cell 607 and the sample transmission cell 608, the top of reference transmission cell 607 and sample transmission cell 608 all is provided with inlet and the liquid outlet that is linked together with the stock solution cavity.
The continuous sampling system comprises a first peristaltic pump 613 and a second peristaltic pump 614, and liquid inlet ends and liquid outlet ends of the first peristaltic pump 613 and the second peristaltic pump 614 are respectively communicated with a liquid inlet pipe 615 and a liquid outlet pipe 616.
The inlet end of the first peristaltic pump 613 is communicated with the reflux pool 2 through an inlet pipe 615, and the outlet end of the first peristaltic pump 613 is communicated with the inlet of the sample transmission cuvette 608 through an outlet pipe 616.
The liquid inlet end of the second peristaltic pump 614 is communicated with the reference sample cell 619 through a liquid inlet pipe 615, and the liquid outlet end of the second peristaltic pump 614 is communicated with the liquid inlet of the reference transmission cuvette 607 through a liquid outlet pipe 616.
A reference sample is stored in the reference sample cell 619, and the reference sample is water.
The first peristaltic pump 613 can suck the water and fertilizer flowing back in the backflow pool 2 through the liquid inlet pipe 615 to obtain a measurement sample, and then the first peristaltic pump 613 can convey the measurement sample to the sample transmission cuvette 608 through the liquid outlet pipe 616, and at this time, the sample transmission cuvette 608 is used for storing the measurement sample.
The second peristaltic pump 614 may draw the reference sample in the reference sample cell 619 through the inlet tube 615 and deliver the reference sample to the reference transmission cuvette 607 through the outlet tube 616, where the reference transmission cuvette 607 is used for storing the reference sample.
In addition, the first peristaltic pump 613 and the second peristaltic pump 614 can accurately measure the measurement sample and the reference sample conveyed in the liquid inlet pipe 615 and the liquid outlet pipe 616, so that the volumes of the liquid samples contained in the reference transmission cuvette 607 and the sample transmission cuvette 608 are uniform, and the accuracy of the detection data is improved.
The liquid outlet and the waste water collecting vessel intercommunication of reference transmission cell 607 and sample transmission cell 608, detect the liquid sample of accomplishing in reference transmission cell 607 and the sample transmission cell 608 and collect, handle in passing through the liquid outlet water conservancy diversion to the waste water collecting vessel.
As shown in fig. 1, a greenhouse environment detection module 9 is disposed at the position of the sand culture substrate 1, and the greenhouse environment detection module 9 is used for constantly detecting the environment temperature, the illumination intensity, the humidity in the greenhouse and the water content in the sand culture substrate 1.
The greenhouse environment detection module 9 is the prior art and can be directly purchased and obtained from the market.
As shown in fig. 1, the platform control system 7 includes a liquid manure management and control platform 71 and a main controller 72, and the liquid manure management and control platform 71 is electrically connected to the main controller 72.
The liquid manure management and control platform 71 can issue an instruction to control the main controller 72.
The first electromagnetic flow meter 45, the first electromagnetic valve 46 and the fertilizer suction pump 47 corresponding to each barrel of the on-line automatic fertilizer preparation module 4 are respectively and electrically connected with the main controller 72.
The volume of the delivered water fertilizer in the water fertilizer pipe 49 detected by the first electromagnetic flowmeter 45 is sent to the main controller 72 at any moment.
The main controller 72 sends signals to control the opening or closing of the first solenoid valve 46 and the starting or stopping of the fertilizer suction pump 47.
The second electromagnetic flow meter 33 and the main pipeline electromagnetic valve 34 are electrically connected with the liquid manure control platform 71 respectively, the liquid manure control platform 71 is constantly sent to the liquid manure control platform 71 by the volume of liquid manure conveying in the fertilization header pipe 3 detected by the second electromagnetic flow meter 33, and the liquid manure control platform 71 is used for controlling the opening or closing of the main pipeline electromagnetic valve 34.
The output end of the in-situ detection module 6 is connected with the liquid manure management and control platform 71, and the content of nitrogen, phosphorus and potassium nutrients in the liquid manure detected by the in-situ detection module 6 is sent to the liquid manure management and control platform 71 at any moment.
And preset thresholds of the content of nitrogen, phosphorus and potassium nutrients of corresponding growth stages are respectively stored in the water and fertilizer control platform 71 according to the growth stages of crops.
The in-situ detection module 6 detects the content of the nitrogen, phosphorus and potassium nutrients in the water and fertilizer, sends the content of the nitrogen, phosphorus and potassium nutrients to the water and fertilizer control platform 71 and compares the content of the nitrogen, phosphorus and potassium nutrients with a preset threshold value of the content of the nitrogen, phosphorus and potassium nutrients stored in the water and fertilizer control platform 71.
When the in-situ detection module 6 detects that the content of nitrogen, phosphorus and potassium nutrients in the water and fertilizer is smaller than a preset threshold value of the content of nitrogen, phosphorus and potassium nutrients stored in the water and fertilizer control platform 71, the water and fertilizer control platform 71 controls the in-situ detection module 6 to prepare fertilizer through the main controller 72 and conveys the fertilizer into the sand culture substrate 1.
Liquid level detector 21 and liquid manure management and control platform 71 electric connection, liquid level detector 21 detects the liquid level of the interior liquid manure of the liquid return pool 2 that obtains and sends to in the liquid manure management and control platform 71 constantly.
An upper liquid level set value and a lower liquid level set value of the liquid returning pool 2 are arranged in the liquid manure control platform 71.
The liquid level of the liquid manure in the liquid returning pool 2 detected by the liquid level detector 21 is sent into the liquid manure control platform 71 and compared with an upper liquid level set value and a lower liquid level set value stored in the liquid manure control platform 71.
When the liquid level of the liquid manure in the liquid returning pool 2 detected by the liquid level detector 21 is greater than the upper liquid level set value stored in the liquid manure control platform 71, the liquid manure control platform 71 can start the circulating pump 81, so that the liquid manure in the liquid returning pool 2 is used for fertilizing the sand culture substrate 1.
When the liquid level of the liquid manure in the liquid returning pool 2 detected by the liquid level detector 21 is smaller than the lower liquid level set value, the liquid manure control platform 71 controls the circulating pump 81 to stop working.
The output end of the greenhouse environment detection module 9 is electrically connected with the water and fertilizer control platform 71, and the greenhouse environment detection module 9 detects the temperature, the illumination intensity and the water content in the sand culture medium 1 in the greenhouse and sends the water and fertilizer control platform 71 to the greenhouse.
And a set value of the illumination intensity is arranged in the water and fertilizer control platform 71.
The greenhouse environment detection module 9 detects the intensity of illumination in the greenhouse, sends the intensity of illumination in the greenhouse to the liquid manure management and control platform 71, and compares the intensity of illumination with a set value of the intensity of illumination stored in the liquid manure management and control platform 71.
When the illumination intensity in the greenhouse detected by the greenhouse environment detection module 9 meets the illumination intensity set value stored in the liquid manure management and control platform 71, the liquid manure can be irrigated at the moment.
The water and fertilizer control platform 71 is internally provided with a set value of the water content of the sand culture substrate 1.
The greenhouse environment detection module 9 detects that the water content in the sand culture substrate 1 is sent to the water and fertilizer control platform 71 to be compared with a water content set value stored in the water and fertilizer control platform 71.
When the greenhouse environment detection module 9 detects that the water content in the sand culture substrate 1 is less than or equal to the water content set value stored in the water and fertilizer control platform 71, the water and fertilizer are required to be poured into the sand culture substrate 1.
As shown in fig. 1-8, a method for controlling the accurate supply of water and fertilizer content in a crop sand culture medium is based on the system for accurately supplying water and fertilizer content in a crop sand culture medium, and the method comprises the following steps:
and S1, setting the volume a of the irrigation water for each time, and setting each nutrient element according to the volume a of the irrigation water for each time.
The volume a of irrigation water in each time in step S1 can be set according to the water shortage in the sand culture substrate 1, but it is recommended to set the volume a to 1 square water each time.
S2, reading and recording the water content, and judging whether the sand culture substrate 1 needs to be watered with water and fertilizer, wherein the greenhouse environment detection module 9 detects the water content in the sand culture substrate 1 and sends the water content to the water and fertilizer control platform 71 to be compared with a set water content value, no action is performed when the water content in the sand culture substrate 1 is greater than the set water content value, and the step S3 is performed when the water content in the sand culture substrate 1 is less than the set water content value.
S3, judging whether the environment in the greenhouse accords with watering, detecting by the greenhouse environment detection module 9 to obtain the illumination intensity, sending the illumination intensity to the liquid manure control platform 71, comparing the illumination intensity with the illumination intensity set value in the liquid manure control platform 71, and when the illumination intensity in the greenhouse is smaller than the illumination intensity set value, no action is performed, and when the illumination intensity in the greenhouse is larger than the illumination intensity set value. Step S4 is performed.
S4, the liquid level detector 21 detects the liquid level and compares the liquid level in the liquid returning pool 2 with the upper liquid level set value, and when the liquid level in the liquid returning pool 2 is smaller than the upper liquid level set value, the step S5 is performed.
In the step S4, when the liquid level in the liquid returning pool 2 is greater than the upper liquid level set value, the circulating pump 81 is started to irrigate the sand culture substrate 1 with the liquid manure in the liquid returning pool 2.
And judge the liquid level of the water and fertilizer in the backflow pool 2, stop the circulating pump 81 when the liquid level of the water and fertilizer in the backflow pool 2 is less than the upper liquid level set value, and stop the circulating pump 81 when the liquid level of the water and fertilizer in the backflow pool 2 is less than the single irrigation total amount.
The total amount of the single irrigation is a set value, and a user can set the total amount according to the water shortage condition in the sand culture substrate 1.
S5, the water and fertilizer control platform 71 controls the opening of the main pipeline electromagnetic valve 34, so that the fertilization header pipe 3 waters the water and fertilizer to the sand culture substrate 1.
S6, the in-situ detection module 6 judges the contents of nitrogen, phosphorus and potassium in the water fertilizer reflowing to the liquid returning pool 2 in the sand culture substrate 1, and the continuous sample feeding system conveys the measured samples to the in-situ detection module 6 and respectively detects the contents of nitrogen, phosphorus and potassium in the measured samples;
when the content of nitrogen element in the sample is determined to be less than the preset threshold value of the nitrogen content, the nitrogen fertilizer bucket 41 outputs the nitrogen fertilizer; when the content of nitrogen element in the sample is determined to be greater than the preset threshold value of nitrogen content, the nitrogen fertilizer amount output by the nitrogen fertilizer barrel 41 is 0, and the process goes to step S7.
When the content of phosphorus element in the sample is determined to be less than the preset threshold value of the phosphorus content, the phosphate fertilizer barrel 43 outputs phosphate fertilizer; when the content of phosphorus element in the sample is determined to be greater than the preset threshold value of phosphorus content, the output amount of phosphorus fertilizer from the phosphate fertilizer barrel 43 is 0, and the process proceeds to step S7.
When the content of the potassium element in the sample is determined to be less than the preset threshold value of the potassium content, the potassium fertilizer barrel 42 outputs the potassium fertilizer; when the content of the potassium element in the sample is determined to be greater than the preset threshold value of the potassium content, the output potassium fertilizer amount of the potassium fertilizer barrel 42 is 0, and the process proceeds to step S7.
In step S6, the in-situ detection module 6 detects and analyzes the contents of nitrogen, phosphorus, and potassium in the liquid manure in the liquid returning pool 2, and the method includes the following steps:
1) and the continuous sample feeding system samples the water and fertilizer in the liquid returning pool 2 to obtain a measured sample, and the measured sample and the reference sample are respectively conveyed into a sample transmission cuvette 608 and a reference transmission cuvette 607 of the in-situ detection module 6.
In the step 1), when the continuous sampling system delivers the measurement sample, the first peristaltic pump 613 operates to suck the liquid fertilizer in the liquid returning pool 2 through the liquid inlet pipe 615 to obtain the measurement sample, and deliver the measurement sample to the sample transmission cuvette 608 through the liquid outlet pipe 616.
In the step 1), when the continuous sampling system delivers the reference sample, the second peristaltic pump 614 sucks the reference sample in the reference sample cell 619 through the liquid inlet tube 615, and delivers the reference sample to the reference transmission cuvette 607 through the liquid outlet tube 616.
2) The laser source 601 emits a light source with a specific wavelength and transmits the light source to the multimode laser splitter 602, the multimode laser splitter 602 splits the light source with the specific wavelength into a measurement reference laser beam and a measurement sample laser beam, the measurement reference laser beam is transmitted to the reference transmission cuvette 607 along a measurement reference light source line 617 for irradiating a reference sample, and the measurement sample laser beam is transmitted to the sample transmission cuvette 608 along a measurement sample light source line 618 for irradiating the measurement sample.
In the step 2), the laser light source 601 includes three laser light sources 601, and the three laser light sources 601 are a nitrogen element detection laser light source, a phosphorus element detection laser light source, and a potassium element detection laser light source, respectively.
The nitrogen element detection laser light source is used for detecting, analyzing and determining the content of nitrogen elements in a sample, and the wavelength absorbed by the nitrogen elements is as follows: 210 nm and 230nm, and the wavelength of the nitrogen element detection laser light source is preferably 217 nm.
The phosphorus element detection laser light source is used for detecting, analyzing and determining the content of phosphorus elements in a sample, and the wavelength absorbed by the phosphorus elements is as follows: 460 ℃ and 490nm, the wavelength of the phosphorus element detection laser light source is preferably 490 nm.
The potassium element detection laser light source is used for detecting, analyzing and determining the content of potassium element in a sample, and the wavelength absorbed by the potassium element is as follows: 420-450nm, and the wavelength of the potassium element detection laser light source is preferably 440 nm.
3) And the reference photoelectric detector 605 detects and measures the absorbance of the reference laser beam when irradiating the reference sample in the reference transmission cuvette 607, obtains the reference absorbance, and transmits the reference absorbance to the liquid manure management and control platform 71.
4) And the sample photoelectric detector 606 detects the absorbance of the sample laser beam when irradiating the sample in the sample transmission cuvette 608 to obtain the sample absorbance, and transmits the sample absorbance to the liquid manure management and control platform 71.
5) The liquid manure control platform 71 obtains a reference absorbance signal and a sample absorbance signal, and the reference absorbance signal and the sample absorbance signal are obtained through a formula: and (3) measuring the absorbance of the sample, namely the reference absorbance = the actual absorbance of the sample, obtaining the actual absorbance of the sample, and calculating the content of the corresponding nutrient elements in the measured sample according to the actual absorbance of the sample.
S7, repeating the step S5 when the liquid level height of the water and fertilizer in the liquid returning pool 2 is judged to be smaller than the upper liquid level set value, and entering the step S8 when the liquid level height of the water and fertilizer in the liquid returning pool 2 is judged to be larger than the set value;
the set value in the S7 is the set value of the backflow rising height of the sand culture substrate 1 which flows back to the liquid returning pool 2 every time watering is carried out, and the setting can be set according to the actual situation.
S8, closing the main pipeline electromagnetic valve 34 of the fertilization main pipe 3 and closing all fertilization.
Therefore, the method for accurately supplying and controlling the water and fertilizer content in the crop sand culture medium can accurately detect the water and fertilizer content in the sand culture medium 1, and can quantitatively supply the water and fertilizer to the sand culture medium 1 according to the detection result, so that the nutrient environment in the sand culture medium 1 is in accordance with the nutrient environment required by each growth stage of crops, the growth environment safety of agricultural products can be further ensured, and the crops can thrive.
It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.

Claims (10)

1. Accurate replenishment system of liquid manure content in crops sand culture matrix includes: fertilization house steward (3), its characterized in that: be connected with on-line automatic fertilizer module (4) of joining in marriage that is used for on-line ratio nitrogen, phosphorus, potassium liquid manure on fertilization house steward (3), liquid manure in fertilization house steward (3) is carried to in sand culture matrix (1), liquid pond (2) have been seted up back to one side of sand culture matrix (1), pre-buried in sand culture matrix (1) has the guiding device (5) of carrying out water conservancy diversion to returning in the liquid pond (2) to surplus liquid manure in sand culture matrix (1), one side of liquid pond (2) is provided with and is used for carrying out online analysis's normal position detection module (6) to the liquid manure that flows back to in the liquid pond (2) in sand culture matrix (1), normal position detection module (6) and on-line automatic fertilizer module (4) of joining in marriage all have platform control system (7) to carry out automated control.
2. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 1, wherein: on-line automatic fertilizer preparation module (4) comprises a nitrogen fertilizer barrel (41), a potassium fertilizer barrel (42), a phosphate fertilizer barrel (43) and a trace element barrel (44), wherein the nitrogen fertilizer barrel (41), the potassium fertilizer barrel (42), the phosphate fertilizer barrel (43), the trace element barrel (44) and a fertilization header pipe (3) are communicated through corresponding water and fertilizer pipes (49), and a first electromagnetic flowmeter (45), a first electromagnetic valve (46), a fertilizer suction pump (47) and a flowmeter (48) are sequentially arranged on the water and fertilizer pipes (49).
3. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 2, is characterized in that: the flow guide device (5) comprises a flow guide box (51), a flow guide channel (52) is arranged in the flow guide box (51), a liquid inlet (53) communicated with the flow guide channel (52) is arranged above the flow guide box (51), a filter permeable layer (54) is arranged at the position, located at the liquid inlet (53), above the flow guide box (51), and a return pipe (55) is arranged between the flow guide box (51) and the liquid return tank (2).
4. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 3, wherein: be provided with in liquid-returning pool (2) and be used for carrying out the liquid level detector (21) that detect to the liquid manure liquid level of storing in liquid-returning pool (2), be provided with out fertile pipe (8) between liquid-returning pool (2) and fertilization house steward (3), the inlet fluid end that goes out fertile pipe (8) is located liquid-returning pool (2) and the intercommunication has circulating pump (81), goes out the liquid end and fertilization house steward (3) intercommunication of fertile pipe (8).
5. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 4, wherein: the platform control system (7) comprises a liquid manure control platform (71) and a main controller (72), wherein the liquid manure control platform (71) is electrically connected with the main controller (72);
the first electromagnetic flow meter (45), the first electromagnetic valve (46) and the fertilizer suction pump (47) corresponding to each barrel of the on-line automatic fertilizer distribution module (4) are respectively and electrically connected with the main controller (72).
6. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 5, is characterized in that: the second electromagnetic flowmeter (33) and the main pipeline electromagnetic valve (34) are respectively electrically connected with the water and fertilizer control platform (71);
the output end of the in-situ detection module (6) is connected with the water and fertilizer control platform (71), and the contents of nitrogen, phosphorus and potassium nutrients in the water and fertilizer detected by the in-situ detection module (6) are sent to the water and fertilizer control platform (71) all the time;
the liquid level detector (21) is electrically connected with the liquid fertilizer control platform (71), and the liquid level of the liquid fertilizer in the liquid returning pool (2) detected by the liquid level detector (21) is constantly sent into the liquid fertilizer control platform (71);
the water and fertilizer management and control platform (71) is connected with a greenhouse environment detection module (9), and the greenhouse environment detection module (9) is used for detecting the environment temperature, the illumination intensity, the humidity in the greenhouse and the water content in the sand culture substrate (1) constantly.
7. The system for accurately supplementing the content of water and fertilizer in the crop sand culture medium according to claim 6, wherein: preset thresholds of the content of nitrogen, phosphorus and potassium nutrients of corresponding growth stages are respectively stored in the water and fertilizer control platform (71) according to the growth stages of crops;
an upper liquid level set value and a lower liquid level set value of the liquid returning pool (2), an illumination intensity set value and a sand culture substrate water content set value are also arranged in the liquid manure control platform (71).
8. A method for accurately supplying and controlling the content of water and fertilizer in a crop sand culture medium is characterized by comprising the following steps: a system for accurately supplementing the water and fertilizer content in the crop sand culture substrate based on any one of the crop sand culture substrates; the method comprises the following steps:
s1, setting the volume a of irrigation water each time, and setting nutrient elements according to the volume a of the irrigation water each time;
s2, judging whether the sand culture substrate (1) needs to be watered with water and fertilizer, if the greenhouse environment detection module (9) detects that the water content in the sand culture substrate (1) is larger than a set water content value, no action is performed, and if the water content in the sand culture substrate (1) is smaller than the set water content value, the step S3 is performed;
s3, judging whether the environment in the shed accords with watering, detecting by a greenhouse environment detection module (9) that no action is caused when the illumination intensity is smaller than the illumination intensity set value, and performing S4 when the illumination intensity in the shed is larger than the illumination intensity set value;
s4, comparing the liquid level in the liquid returning pool (2) detected by the liquid level detector (21) with an upper liquid level set value by the liquid level control platform (71), and performing S5 when the liquid level in the liquid returning pool (2) is less than the upper liquid level set value;
s5, the water and fertilizer control platform (71) controls the opening of a main pipeline electromagnetic valve (34) on the fertilization main pipe (3) so that the fertilization main pipe (3) can irrigate the water and fertilizer to the sand culture substrate (1).
9. The method for controlling the accurate supply of water and fertilizer content in the crop sand culture medium according to claim 8, wherein the method comprises the following steps: the method further comprises the following steps:
s6, the in-situ detection module (6) judges whether the content of nitrogen, phosphorus and potassium in the water and fertilizer of the sand culture substrate (1) is smaller than the preset threshold value of the corresponding content of nitrogen, phosphorus and potassium, and the corresponding nitrogen fertilizer barrel (41), phosphorus fertilizer barrel (43) and potassium fertilizer barrel (42) output corresponding nitrogen, phosphorus and potassium fertilizers; when the content of nitrogen, phosphorus and potassium in the water fertilizer of the sand culture substrate (1) is larger than the preset threshold value of the corresponding content of nitrogen, phosphorus and potassium, the step S7 is executed;
s7, repeating the step S5 when the liquid level height of the water and fertilizer in the liquid returning pool (2) is judged to be smaller than the upper liquid level set value, and entering the step S8 when the liquid level height of the water and fertilizer in the liquid returning pool (2) is judged to be larger than the set value;
s8, closing the main pipeline electromagnetic valve (34) of the fertilization main pipe (3) and closing all fertilization.
10. The method for controlling the accurate supply of water and fertilizer content in the crop sand culture medium according to claim 9, wherein the method comprises the following steps: in the step S4, when the liquid level in the liquid return pool (2) is larger than the upper liquid level set value, a circulating pump (81) is started to irrigate the sand culture substrate (1) by using the water and fertilizer in the liquid return pool (2);
and the liquid level of the water and fertilizer in the backflow pool (2) is judged, when the liquid level of the water and fertilizer in the backflow pool (2) is smaller than the upper liquid level set value, the circulating pump (81) is stopped, and when the liquid level of the water and fertilizer in the backflow pool (2) is smaller than the single irrigation total amount, the circulating pump (81) is stopped.
CN202011206421.1A 2020-11-03 2020-11-03 Accurate water and fertilizer content supply system in crop sand culture medium and control method Pending CN112243846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011206421.1A CN112243846A (en) 2020-11-03 2020-11-03 Accurate water and fertilizer content supply system in crop sand culture medium and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011206421.1A CN112243846A (en) 2020-11-03 2020-11-03 Accurate water and fertilizer content supply system in crop sand culture medium and control method

Publications (1)

Publication Number Publication Date
CN112243846A true CN112243846A (en) 2021-01-22

Family

ID=74269142

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011206421.1A Pending CN112243846A (en) 2020-11-03 2020-11-03 Accurate water and fertilizer content supply system in crop sand culture medium and control method

Country Status (1)

Country Link
CN (1) CN112243846A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103548621A (en) * 2013-10-31 2014-02-05 中国农业大学 Sunlight greenhouse closed type cultivation system and method
CN205374442U (en) * 2016-02-06 2016-07-06 中国农业大学 Soil element on -line measuring device
CN205454584U (en) * 2016-03-18 2016-08-17 商丘市农林科学院 Farmland fertilization irrigation system
CN106359017A (en) * 2016-08-19 2017-02-01 灌阳县陈工选矿机械制造有限公司 Plant intelligent watering method and device
CN109105243A (en) * 2018-10-25 2019-01-01 北京市农业技术推广站 Light skeleton symbol intelligent irrigation fertilizer applicator and its control method for substrate culture
CN109937667A (en) * 2019-03-13 2019-06-28 青岛农业大学 A kind of Tree Precise Fertilization system
CN210168656U (en) * 2019-06-28 2020-03-24 成都辰迅科技有限公司 Remote start irrigation valve system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103548621A (en) * 2013-10-31 2014-02-05 中国农业大学 Sunlight greenhouse closed type cultivation system and method
CN205374442U (en) * 2016-02-06 2016-07-06 中国农业大学 Soil element on -line measuring device
CN205454584U (en) * 2016-03-18 2016-08-17 商丘市农林科学院 Farmland fertilization irrigation system
CN106359017A (en) * 2016-08-19 2017-02-01 灌阳县陈工选矿机械制造有限公司 Plant intelligent watering method and device
CN109105243A (en) * 2018-10-25 2019-01-01 北京市农业技术推广站 Light skeleton symbol intelligent irrigation fertilizer applicator and its control method for substrate culture
CN109937667A (en) * 2019-03-13 2019-06-28 青岛农业大学 A kind of Tree Precise Fertilization system
CN210168656U (en) * 2019-06-28 2020-03-24 成都辰迅科技有限公司 Remote start irrigation valve system

Similar Documents

Publication Publication Date Title
CA1332000C (en) Computerized fertilizer injector system
KR101090279B1 (en) Nutrient solution supply system
CN106664937A (en) Water-fertilizer-integrated four-control irrigating and fertilizing system
CN103621235B (en) The fertile compounding system of a kind of formulation liquid and compound method
KR20030070208A (en) Automatic Controller of Nutrient Solution for Closed Hydroponics
KR101088427B1 (en) Nutrient solution supply control method
CN103217394A (en) Online detection device of water dissolved-out nitrogen nutrients of chemical fertilizer
CN112243846A (en) Accurate water and fertilizer content supply system in crop sand culture medium and control method
CN111357459A (en) Fertigation integrated device
CN204560492U (en) A kind of experimental system optimizing plant nitrogen fertilizer amount of application
CN203482610U (en) Preparation system of liquid formula fertilizer
CN109937667B (en) Accurate fertilization system
CN204948721U (en) Fertilizing device
CN113950924A (en) Water-fertilizer coupling precise regulation and control system and control method thereof
CN109005851A (en) A kind of control method of quantitative fertilization system
CN206879423U (en) Water-fertilizer integral four controls Irrigation and fertilization system
CN202285553U (en) System for automatically detecting and preparing fertilizer
CN112033929B (en) In-situ detection device and detection method for content of water and fertilizer in crop cultivation medium
CN208768438U (en) A kind of quantitative fertilization system
CN210202806U (en) Mode crop multilayer planting device
CN212159557U (en) Spectrum analysis equipment for nitrogen, phosphorus and potassium element content in crop cultivation medium
CN106596431A (en) Photoelectric-colorimetry-method-based online detection device for nitrogen-phosphorus-potassium-water-fertilizer nutrient concentrations
CN104620959A (en) Experiment system and method for optimizing plant nitrogen fertilizer application quantity
CN205755520U (en) A kind of single pump fertilizer applicator
KR20150069327A (en) Nutrient solution supply system venturi tube

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination