CN114375825A - Circulating seedling raising device and seedling raising method - Google Patents
Circulating seedling raising device and seedling raising method Download PDFInfo
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- CN114375825A CN114375825A CN202210107823.9A CN202210107823A CN114375825A CN 114375825 A CN114375825 A CN 114375825A CN 202210107823 A CN202210107823 A CN 202210107823A CN 114375825 A CN114375825 A CN 114375825A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
- A01G31/02—Special apparatus therefor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
- A01G2031/006—Soilless cultivation, e.g. hydroponics with means for recycling the nutritive solution
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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Abstract
The invention provides a circulating seedling raising device and a seedling raising method, which comprise a seedling raising pool, wherein a plurality of circulating adjusting mechanisms are arranged inside the edge of the seedling raising pool, each circulating adjusting mechanism comprises an adjusting component, a spiral dissolution assisting component, a conductivity detection component, a suck-back component and a controller, the wall of the seedling raising pool is provided with a plurality of grooves, and the controller is embedded in the seedling raising pool. And the nutrient solution is accurately adjusted by adopting a gradual adjustment mode according to the growth condition of the tobacco seedlings.
Description
Technical Field
The invention belongs to the field of tobacco, and particularly relates to a circulating seedling raising device and a seedling raising method.
Background
The tobacco leaf floating seedling raising is a relatively new seedling raising technology in the tobacco industry, can thoroughly get rid of soil seedling raising, and fundamentally avoids soil-borne diseases which are easy to occur in sudden seedling raising.
Based on the above description, the inventor finds that the existing circulating seedling raising device and seedling raising method mainly have the following defects, for example:
the nutrient solution is replaced in a mode of pumping away and reinjecting, the conductivity of the nutrient solution can be accurately controlled through one-time replacement, but the tobacco seedlings are fixed in the nutrient solution with stable or gradually reduced conductivity within a period of time, when the nutrient solution with higher fertilizer content is improved and replaced within a short time, the tobacco seedlings have no adaptive time, the too high concentration of nutrient components on the surface of the substrate is easy to occur, the growth of the tobacco seedlings is inhibited, the seedling death rate is increased, and the stress resistance of the tobacco seedlings is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a circulating seedling raising device to solve the existing problems.
Aiming at the defects of the prior art, the purpose and the effect of the circulating seedling raising device are achieved by the following specific technical means: the utility model provides a circulation device of growing seedlings, includes the pond of growing seedlings, it is equipped with a plurality of circulation adjustment mechanism along inside to grow seedlings the pond, circulation adjustment mechanism includes that adjusting part, spiral help and dissolve subassembly, conductivity detection subassembly, resorption subassembly, controller, suction filtration pump, it has a plurality of recess to grow seedlings pond wall, install the suction filtration pump in the recess, suction filtration pump side is equipped with adjusting part, the spiral helps and dissolves the subassembly and is located the adjusting part below, the spiral helps and dissolves the subassembly below and is provided with the resorption subassembly, resorption subassembly movable mounting is in growing seedlings the pond, it helps dissolving subassembly, conductivity detection subassembly, resorption subassembly, suction filtration pump electric connection's controller still to inlay in the pond of growing seedlings to be equipped with and adjusting part, spiral.
The conductivity detection assembly comprises a first conductivity detector and a second conductivity detector, the first conductivity detector is arranged in the middle of the nursery pond and used for detecting the conductivity of the initial nutrient solution in the nursery pond, and the second conductivity detector is arranged at the outlet of the spiral pipe and used for detecting the conductivity of the adjusted nutrient solution.
Preferably, the adjusting assembly comprises a fertilizer barrel, a fertilizer output pipe, an electromagnetic valve and a clean water pipe, the fertilizer output pipe is connected below the fertilizer barrel, the electromagnetic valve is arranged below the fertilizer barrel, the front side of the electromagnetic valve is connected with the clean water pipe, the back side of the electromagnetic valve is connected with the fertilizer output pipe, and the clean water pipe is connected with an external water source.
Preferably, the spiral dissolving-assisting assembly comprises a spiral pipe, an air pump is mounted on the side face of the spiral pipe, and the air pump is electrically connected with the controller.
Preferably, the spiral tube is internally provided with a plurality of flagella.
Preferably, the suck-back assembly comprises a wide-mouth barrel, a suction machine and a suck-back pipe, the suction machine is arranged below the wide-mouth barrel and connected with the suck-back pipe, and the suck-back pipe is embedded into the wide-mouth barrel and used for returning nutrient solution in the wide-mouth barrel to the seedling raising pond through the suction machine.
Preferably, a pressure trigger is arranged between the suction machine and the wide-mouth cylinder.
Compared with the prior art, the invention has the following advantagesAdvantageous effects：
According to the invention, by arranging the circulating adjusting mechanism, the nutrient solution in the seedling raising pool can be monitored in real time through the conductivity detection assembly, wherein the conductivity detection assembly can be used for accurately measuring the conductivity of the internal initial nutrient solution to the greatest extent in the process of replacing the nutrient solution, extracting the nutrient solution in the seedling raising pool, adding fertilizer into the extracted nutrient solution in the seedling raising pool through the fertilizer barrel in the adjusting assembly, rapidly fusing the fertilizer and the nutrient solution through the spiral dissolving-assisting assembly, and further gradually adjusting the fertilizer amount in the nutrient solution through the accurate control on the conductivity of the nutrient solution.
Due to the fact that the diffusion mixing rate of the new nutrient solution and the diffusion mixing rate of the old nutrient solution are random, the mixing degree of the mixed solution at different positions is different, after extraction and adjustment, correction data can be obtained through detection of the second conductivity detector, the output quantity of the fertilizer is adjusted through the adjusting assemblies, and therefore the conductivity of the nutrient solution output by the adjusting assemblies can be consistent.
When gathering the nutrient solution, from being close to through the suction filter pump, carry out the extraction of nutrient solution from second conductivity detector department to discharge new nutrient solution at the edge of growing seedlings pond, draw through the rivers of suction, can make new nutrient solution towards middle gradual diffusion, thereby accomplish the replacement, in the stage of growing seedlings of difference, adopt the mode of gradual regulation, according to the situation of tobacco seedling growth, accurate regulation nutrient solution.
Drawings
Fig. 1 is a schematic structural diagram of a circulating seedling raising device.
Fig. 2 is a schematic front sectional view of a circulating seedling raising device according to the present invention.
Fig. 3 is a schematic structural view of the circulation adjusting mechanism.
Fig. 4 is a detailed structural schematic diagram of the circulation adjusting mechanism.
Fig. 5 is a detailed structural diagram of the suck back assembly.
Fig. 6 is a schematic view of a supporting frame structure.
FIG. 7 is a schematic view of a partial cross-sectional structure of a spiral pipe.
FIG. 8 is a plan view of the nursery pond.
In the figure: a seedling raising pool-1, a support frame-2, a circulation adjusting mechanism-3 and a floating disc-4;
a camera-21;
a regulating component-31, a spiral dissolving-assisting component-32, a conductivity detection component-33, a back suction component-34, a controller-35 and a suction filter pump-36;
a fertilizer barrel-311, a fertilizer output pipe-312, an electromagnetic valve-313 and a clear water pipe-314;
a spiral tube-321 and an air pump-322;
a suction tube-361;
a first conductivity detector-331, a second conductivity detector-332;
flagellum-3211;
wide-mouth cylinder-341, suction machine-342, return suction pipe-343;
spring-3411, pressure trigger-3421.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
As shown in figures 1 to 8:
the invention provides a circulating seedling raising device which comprises a seedling raising pool, wherein a plurality of circulating adjusting mechanisms are arranged inside the edge of the seedling raising pool 1, the circulation adjusting mechanism 3 comprises an adjusting component 31, a spiral dissolving-assisting component 32, a conductivity detection component 33, a back suction component 34, a controller 35 and a suction filter pump 36, the wall of the seedling raising pond 1 is provided with a plurality of grooves, a suction filter pump 36 is arranged in each groove, the side surface of the suction filter pump 36 is provided with an adjusting component 31, the spiral dissolving-assisting component 32 is positioned below the adjusting component 31, a back suction component 34 is arranged below the spiral dissolving-assisting component 32, the back suction component 34 is movably arranged in the seedling raising pond 1, the nursery pond 1 is also embedded with a controller 35 which is electrically connected with the adjusting component 31, the spiral dissolving-assisting component 32, the conductivity detection component 33, the suck-back component 34 and the suction filter pump 36.
In this embodiment, the wall of the nursery pond 1 is provided with 4 grooves, and 4 groups of circulation adjusting mechanisms 3 are correspondingly arranged.
As a further improvement, the conductivity detection assembly 33 comprises a first conductivity detector 331 and a second conductivity detector 332, wherein the first conductivity detector 331 is disposed at a middle position of the nursery pond 1 and is used for detecting the conductivity of the initial nutrient solution in the nursery pond 1, and the second conductivity detector 332 is disposed at an outlet of the spiral pipe 321 and is used for detecting the conductivity of the adjusted nutrient solution. The first conductivity detector 331 is vertically arranged in the middle of the seedling raising pond 1, and the test points are positioned on the side surface, so that the contact with the floating disc 4 can be effectively avoided, and meanwhile, the original nutrient solution in the seedling raising pond 1 can be accurately collected; the nutrient solution after the regulation can be followed the side and spread the mixture towards the centre gradually, and the suction and the release of nutrient solution can form rivers dynamic circulation simultaneously to drive floating plate 4 floating movement, can contact the nutrient solution after the regulation sooner. The second conductivity detector 332 is disposed at the tail of the spiral pipe 321, and is configured to obtain the conductivity of the mixed new nutrient solution, and transmit the detected conductivity to the controller 35; furthermore, the number of the second conductivity detectors 332 in each group of regulating assemblies 31 is 1, because the diffusion rate has an error, and the mixing degree of the nutrient solution sucked by the nutrient solution has a difference, the second conductivity detectors 332 can detect and obtain correction data, and the controller 35 can adjust the fertilizer amount output by the regulating assemblies 21, so that the conductivity of the nutrient solution output by the regulating assemblies 31 can be consistent.
As further improvement, 1 pond edge in pond of growing seedlings is equipped with support frame 2, be provided with camera 21 on support frame 2 for set up the anchor point region on growing seedlings pond 1, shoot the floating plate 4 that gets into the anchor point region through the camera.
As a further improvement, the adjusting assembly 31 includes a fertilizer barrel 311, a fertilizer output tube 312, an electromagnetic valve 313 and a clean water tube 314, the fertilizer output tube 312 is connected below the fertilizer barrel 311, the electromagnetic valve 313 is arranged below the fertilizer barrel 311, the front surface of the electromagnetic valve 313 is connected with the clean water tube 314, the back surface of the electromagnetic valve 313 is connected with the fertilizer output tube 312, and the clean water tube 314 is connected with an external water source. The fertilizer barrel 311 is used for supplementing the fertilizer amount of the nutrient solution when the nutrient solution is lower than the standard conductivity in the seedling raising process; when the fertilizer amount in the nutrient solution needs to be gradually reduced in the seedling transplanting period, the clear water pipe 314 can replace the fertilizer barrel 311 to dilute the nutrient solution, so that the fertilizer amount is reduced. The electromagnetic valve 313 is a double-control electromagnetic valve, different input objects and the time length of opening at intervals at different stages can be adjusted under the control of the controller 35, and when the first adjustment amount is 2-3g/L, the opening time corresponding to the electromagnetic valve 313 is 1 s; the second regulating quantity is 4-6g/L, and the opening time of the corresponding electromagnetic valve 313 is 2 s; the third regulating quantity is 7-10 g/L, and the opening time of the electromagnetic valve 313 is 3 s.
As a further improvement, the spiral solubilizing assisting assembly 32 comprises a spiral pipe 321, an air pump 322 is installed on the side surface of the spiral pipe 321, the air pump 322 is electrically connected with the controller 35, and a plurality of flagella 3211 are arranged inside the spiral pipe 321. The spiral pipe 321 is arranged from top to bottom, the diameter of the spiral pipe 321 is gradually increased, so that the phenomenon that the flow rate of the upper end is high and the flow rate of the lower end is low is formed, and in order to reduce the influence on the conductivity detection, the air pump 322 is used for performing short-time air pressure filling on the spiral pipe 321 when the spiral pipe 321 is blocked, so that the spiral pipe can be maintained in a normal state. The flagella 3211 are welded on the inner wall of the spiral pipe 321, the flagella 3211 is 1-1.5cm long, the annular section is provided with an angle of 120 degrees, the transverse distance is 3cm, and the diameter of the spiral pipe is 0.5mm and is provided with elastic metal wires.
As a further improvement, the suck-back assembly 34 includes a wide-mouth cylinder 341, a suction machine 342, and a suck-back pipe 343, the suction machine 342 is disposed below the wide-mouth cylinder 341, the suction machine 342 is connected to the suck-back pipe 343, and the suck-back pipe 343 is embedded inside the wide-mouth cylinder 341 for returning the nutrient solution in the wide-mouth cylinder 341 to the seedling raising pond 1 through the suction machine 342. A pressure trigger 3421 is arranged between the suction machine 342 and the wide-mouth cylinder 341. The wide-mouth tube 341 is used for containing the nutrient solution mixed by the spiral tube 321, and when the nutrient solution is contained in the wide-mouth tube 341, the pressure trigger 3421 is activated passively, so that the current is introduced into the suction machine 342, and the nutrient solution is sucked and refluxed into the seedling raising pond 1 by further controlling the return suction pipe 343 inserted into the wide-mouth tube 341.
A circulating seedling raising method is characterized in that:
s1, acquiring tobacco seedling leaf images in the seedling raising pond, and acquiring the closest sample image through database comparison;
s2, acquiring the corresponding first nutrient solution conductivity data through the closest sample image, and transmitting the data to the controller;
s3, detecting the conductivity data of the nutrient solution in the seedling raising pond to obtain the conductivity data of a second nutrient solution, and transmitting the data to the controller;
s4, the controller compares the difference range of the conductivity data of the first nutrient solution and the conductivity data of the second nutrient solution, controls the output of the additive, and outputs a first regulating quantity when the difference range is within the first difference range; when the difference value is within the second difference value range, outputting a second regulating quantity; when the nutrient solution is in the third difference value adjusting range, outputting a third adjusting quantity to obtain a new nutrient solution;
s5, detecting and discharging the new nutrient solution to obtain conductivity data of a third nutrient solution, and feeding the data back to the controller;
and S6, the controller compares the conductivity data of the first nutrient solution with the conductivity data of the third nutrient solution and finely adjusts the output of the additive.
In step S1, the step of acquiring an image of a tobacco seedling leaf includes:
and S11, setting an anchor point area on the seedling raising pond, shooting the floating plate entering the anchor point area through a camera, wherein the diameter of the anchor point area is 1-1.5 m.
And S12, when the floating disc completely enters the anchor point area, the camera collects effective images.
In step S4, if the difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the nursery pond is within a first difference range of 0.1-0.4 ms/cm, the output quantity of the fertilizer is a first regulating quantity of 2-3 g/L; if the range of the second difference value obtained by subtracting the conductivity of the second nutrient solution from the conductivity of the first nutrient solution in the seedling raising pond is 0.5-0.9 ms/cm, the output quantity of the fertilizer is 4-6 g/L; if the third difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the seedling raising pond is within the adjusting range of 1-1.2ms/cm, the output quantity of the fertilizer is 7-10 g/L of the output third adjusting quantity. Wherein the first default output is the lowest adjustment.
S41, if the nutrient solution in the seedling raising pool needs to be reduced in the seedling transplanting stage, if the difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the seedling raising pool is within a first difference range of 0.1-0.4 ms/cm, the output quantity of the fertilizer is a first regulating quantity of 50-100 ml/L; if the difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the nursery pond is 0.5-0.9 ms/cm, the output quantity of the fertilizer is 150ml/L with the second regulating quantity of 100-; if the third difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the nursery pond is within the adjustment range of 1-1.2ms/cm, the output quantity of the fertilizer is 200-250 ml/L of the output third adjustment quantity. Wherein the first default output is the lowest adjustment.
S42, setting the conductivity range of the conductivity of the first nutrient solution, sowing for 1-1.5ms/cm, thinning for 2-2.5ms/cm, first leaf cutting for 2.5-3ms/cm and third leaf cutting for 2-2.5ms/cm, wherein the initial value of the conductivity of the first nutrient solution is the lowest value in the preset conductivity range, and the initial value is increased to the highest value in the conductivity range along with the time, and further increased by 0.1ms/cm every 12H.
S43, gradually reducing the conductivity to 1-1.5ms/cm in the seedling transplanting period.
In step S6, if the first nutrient solution conductivity minus the third nutrient solution conductivity is in the first interval of 0-0.1ms/cm, no adjustment is made, if the first nutrient solution conductivity is in the range of 0.2-0.3ms/cm, the adjustment amount is increased by 1g/L or 50ml/L, otherwise, the adjustment amount is decreased.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. The utility model provides a circulation device of growing seedlings, includes nursery pond (1), nursery pond (1) pond is equipped with a plurality of circulation adjustment mechanism (3) its characterized in that along inside:
the circulation adjusting mechanism (3) comprises an adjusting component (31), a spiral dissolving-assisting component (32), a conductivity detection component (33), a back suction component (34), a controller (35) and a first suction filter pump (36), the wall of the seedling raising pool (1) is provided with a plurality of grooves, a first suction filter pump (36) is arranged in each groove, the side surface of the first suction filtration pump (36) is provided with an adjusting component (31), the spiral dissolving-assisting component (32) is positioned below the adjusting component (31), a back suction component (34) is arranged below the spiral dissolving-assisting component (32), the back suction component (34) is movably arranged in the seedling raising pool (1), a controller (35) electrically connected with the adjusting component (31), the spiral dissolving-assisting component (32), the conductivity detection component (33), the suck-back component (34) and the first suction filter pump (36) is also embedded in the seedling raising pond (1);
the conductivity detection assembly (33) comprises a first conductivity detector (331) and a second conductivity detector (332), wherein the first conductivity detector (331) is arranged in the middle of the nursery pond (1) and used for detecting the conductivity of the initial nutrient solution in the nursery pond (1), and the second conductivity detector (332) is arranged at the outlet of the spiral pipe (321) and used for detecting the conductivity of the adjusted nutrient solution.
2. The circulating seedling raising device according to claim 1, characterized in that: the adjusting component (31) comprises a fertilizer barrel (311), a fertilizer output pipe (312), an electromagnetic valve (313) and a clean water pipe (314), the fertilizer output pipe (312) is connected below the fertilizer barrel (311), the electromagnetic valve (313) is arranged below the fertilizer barrel (311), the front side of the electromagnetic valve (313) is connected with the clean water pipe (314), the back side of the electromagnetic valve is connected with the fertilizer output pipe (312), and the clean water pipe (314) is connected with an external water source.
3. The circulating seedling raising device according to claim 1, characterized in that: the spiral dissolving-assisting assembly (32) comprises a spiral pipe (321), an air pump (322) is installed on the side surface of the spiral pipe (321), and the air pump (322) is electrically connected with the controller (35).
4. A circulating seedling raising device according to claim 3, characterized in that: a plurality of flagella (3211) are arranged in the spiral tube (321).
5. The circulating seedling raising device according to claim 1, characterized in that: the suck-back assembly (34) comprises a wide-mouth barrel (341), a suction machine (342) and a suck-back pipe (343), wherein the suction machine (342) is arranged below the wide-mouth barrel (341), the suction machine (342) is connected with the suck-back pipe (343), and the suck-back pipe (343) is embedded into the wide-mouth barrel (341) and is used for returning nutrient solution in the wide-mouth barrel (341) to the seedling raising pool (1) through the suction machine (342).
6. The circulating seedling raising device according to claim 6, characterized in that: a pressure trigger (3421) is arranged between the suction machine (342) and the wide-mouth tube (341).
7. A circulating seedling raising method is characterized in that:
s1, acquiring tobacco seedling leaf images in the seedling raising pond, and acquiring the closest sample image through database comparison;
s2, acquiring the corresponding first nutrient solution conductivity data through the closest sample image, and transmitting the data to the controller;
s3, detecting the conductivity data of the nutrient solution in the seedling raising pond to obtain the conductivity data of a second nutrient solution, and transmitting the data to the controller;
s4, the controller compares the difference value range of the conductivity data of the first nutrient solution and the conductivity data of the second nutrient solution to control the output of the additive; when the difference value is within the first difference value range, outputting a first regulating quantity; when the difference value is within the second difference value range, outputting a second regulating quantity; when the difference is within the third difference adjusting range, outputting a third adjusting quantity;
s5, detecting and discharging the new nutrient solution to obtain conductivity data of a third nutrient solution, and feeding the data back to the controller;
and S6, the controller compares the conductivity data of the first nutrient solution with the conductivity data of the third nutrient solution and finely adjusts the output of the additive.
8. The circulating seedling raising method according to claim 8: the method is characterized in that: in S1, the step of acquiring an image of a tobacco seedling leaf includes:
an anchor point area is arranged on the seedling raising pond, a floating disc entering the anchor point area is shot through a camera, and the diameter of the anchor point area is 1-1.5 m.
9. The circulating seedling raising method according to claim 8: the method is characterized in that: in S4, if the difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the nursery pond is within a first difference range of 0.1-0.4 ms/cm, the output quantity of the fertilizer is a first regulating quantity of 2-3 g/L; if the range of the second difference value obtained by subtracting the conductivity of the second nutrient solution from the conductivity of the first nutrient solution in the seedling raising pond is 0.5-0.9 ms/cm, the output quantity of the fertilizer is 4-6 g/L; if the third difference between the conductivity of the first nutrient solution and the conductivity of the second nutrient solution in the seedling raising pond is within the adjusting range of 1-1.2ms/cm, the output quantity of the fertilizer is 7-10 g/L of the output third adjusting quantity.
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