CN2807764Y - Nutrient solution automatic detection instrument - Google Patents
Nutrient solution automatic detection instrument Download PDFInfo
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- CN2807764Y CN2807764Y CNU2005201106565U CN200520110656U CN2807764Y CN 2807764 Y CN2807764 Y CN 2807764Y CN U2005201106565 U CNU2005201106565 U CN U2005201106565U CN 200520110656 U CN200520110656 U CN 200520110656U CN 2807764 Y CN2807764 Y CN 2807764Y
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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
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- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
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Abstract
The utility model relates to a nutrient solution automatically detecting device, which is composed of a detecting part, a signal preprocessing circuit, a data acquisition unit, a signal processing circuit and peripheral equipment. The nutrient solution automatically detecting device can calculate ion concentration only through measuring the output signals of an ion selective electrode, a reference electrode and a temperature sensor. The nutrient solution automatically detecting device can be directly used on line. Hardware circuits and the volume of a meter are reduced. The nutrient solution automatically detecting device can be serially used after once calibrated. The utility model has the advantages of simple and convenient operation process, rapid and accurate computing process, short lag time and fast measuring speed, which is favorable for on line detection and control. The nutrient solution automatically detecting device can realize the automatic detection of the concentration of the nutrient solution. Furthermore, the utility model has the advantages of simple structure, convenient operation and good stability and reliability of the equipment. The nutrient solution automatically detecting device can stably provide nutrient solution of guaranteed concentration for soilless culture for a long time, which provides a guarantee for crops to grow in an optimal nutrient environment.
Description
Technical field
The utility model relates to agricultural, forestry and plant husbandry and realizes the cultivation technique without soil field, relates in particular to a kind of nutrient solution automatic detection device of soilless culture.
Background technology
Since the seventies in 20th century, greenhouse agriculture has obtained extensive studies and development, to satisfy the requirement to quality, output, the place of production, anti-season, environmental protection and the sustainable development etc. of various agricultural products.A main direction of greenhouse agriculture is exactly the soilless culture that the appliable plant nutrient solution is realized plant.Soilless culture belongs to the important component part of agricultural high-tech, compares with traditional soil cultivation, has protection environment, using water wisely, overcomes characteristics such as continuous cropping obstacle.Soilless culture generally is not subjected to the restriction of soil condition, and the leeway of milpa point selection is big, and idle wasteland, ground, sandy beach, saline land, hillside unfertile land all can be used for soilless culture.Simultaneously, also can alleviate damage by disease and insect, also prevent in soil cultivation because of using the parasitic ovum that slop brings, the product sanitation and hygiene to the infecting of crops.
But there are distinct issues in present cultivation technique without soil, exactly when plant absorbs nutrient from nutrient solution after, needs to add new various nutrients, to satisfy the demand of plant; Common way is that the nutrient solution of getting in the cultivation bed is cooked detection, adds the nutrient of quantitative correspondence again according to testing result.At present, generally all be rule of thumb or analyze the required nutrient of plant and increase new various nutrients.The influence of this method human factor is bigger, can not guarantee the stable of various nutrient components in the nutrient solution exactly.Also exist location, electrode slope compensation, temperature-compensating and equipotential to regulate complicated operations such as operation in the traditional detection Meter Test process.
This just requires a kind of automatic detection device of nutrient solution, can realize that nutrient solution concentration detects automatically.And simple in structure, easy to operate, the stability of equipment and good reliability.Can be steady in a long-term for soilless culture provides concentration guaranteed nutrient solution, provide guarantee for crop grows under optimum nutrient environment.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this utility model provides a kind of nutrient solution automatic detection device, not influenced by human factor, guarantees the stable of various nutrient components in the nutrient solution exactly.Can realize that nutrient solution concentration detects automatically.And simple in structure, easy to operate, the stability of equipment and good reliability.Can be steady in a long-term for soilless culture provides concentration guaranteed nutrient solution, provide guarantee for crop grows under optimum nutrient environment.
The purpose of this utility model is achieved through the following technical solutions:
A kind of nutrient solution automatic detection device comprises and detects groove, detection means, signal preprocessor, data acquisition unit and signal processing circuit; Signal processing circuit has input interface and output interface; Detection means is arranged in and detects the parameter signal of telecommunication that groove detects the nutrient solution of groove, and detection means connects signal preprocessor, data acquisition unit successively; Data acquisition unit connects signal processing circuit by input interface; The parameter signal of telecommunication of the nutrient solution that the detection means that receives signal preprocessor and handle detects, data acquisition unit is gathered the parameter signal of telecommunication of the nutrient solution after signal preprocessor is handled and is delivered to signal processing circuit, the parameter signal of telecommunication of signal processing circuit processing nutrient solution draws the concentration parameter of nutrient solution, is exported by output interface.
Described detection groove comprises feed tube, baffle plate, liquid outlet and cell body; Baffle plate is arranged in cell body cell body is divided into feed liquor district and test section two parts; Feed tube is located at the feed liquor district on one side; Liquid outlet is positioned on the cell body side plate on top, test section; Be provided with the slit between baffle plate bottom and cell body base plate.
The test section of described detection groove is provided with one or more dividing plates the test section is divided into two or more independent tests district, and each independent test district is provided with a liquid outlet respectively.
The feed liquor district of described detection groove is provided with one or more dividing plates the test section is divided into two or more independent feed liquors district, and each independent feed liquor district is provided with a feed tube respectively; Independent feed liquor district is corresponding one by one with the independent test district.
Described a plurality of feed tube front end is a splitter box, and the splitter box middle part is provided with flow distribution plate splitter box is divided into two partly, and some is connected with total feed tube, and another partly connects described a plurality of feed tube; Be provided with the slit between flow distribution plate bottom and shunting cell body base plate.
Described detection means comprises ion-selective electrode, ion reference electrode and temperature sensor; Ion-selective electrode, ion reference electrode and temperature sensor are arranged in and detect groove, and ion-selective electrode, ion reference electrode are connected signal preprocessor with temperature sensor; Temperature sensor can also directly connect signal processing circuit by input interface.
Described signal preprocessor is a differential amplifier circuit, comprise three amplifiers, the first order is made up of two one-level amplifiers, and ion-selective electrode and ion reference electrode connect the positive pole of two one-level amplifiers, and the negative pole of two one-level amplifiers is adjusted the resistance series connection by one; Output termination two utmost point amplifier input terminal of two one-level amplifiers, the output termination data acquisition unit of two utmost point amplifiers.
Described signal preprocessor also comprises low-pass filter circuit, and low-pass filter circuit is a RC network; Low-pass filter circuit is connected in the positive interpolar of ion-selective electrode, ion reference electrode and two one-level amplifiers.
Described output interface can connect output peripheral equipment, comprises display, data logger and/or printer.
Described output interface can connect external input device, comprises keyboard, mouse and/or digitizer.
The technical scheme that is provided by above-mentioned the utility model as can be seen, nutrient solution automatic detection device described in the utility model is made up of detection means, signal pre-processing circuit, data acquisition unit, signal processing circuit and peripheral hardware thereof, the signal that only needs to measure ion-selective electrode and reference electrode and temperature sensor output just can calculate ion concentration, can use by direct-on-line.Reduced hardware circuit and instrument volume, can use continuously after once demarcating, operating process is also simple and convenient; Computational process quick and precisely, lag time is short, measuring speed is very fast, helps online detection and control.Can realize that nutrient solution concentration detects automatically.And simple in structure, easy to operate, the stability of equipment and good reliability.Can be steady in a long-term for soilless culture provides concentration guaranteed nutrient solution, provide guarantee for crop grows under optimum nutrient environment.
Description of drawings
Fig. 1 is a nutrient solution automatic detection device structural representation described in the utility model;
Fig. 2 is the detection groove structural representation left view of nutrient solution automatic detection device described in the utility model;
Fig. 3 is the detection groove structural representation vertical view of nutrient solution automatic detection device described in the utility model;
Fig. 4 is the splitter box structural representation left view of nutrient solution automatic detection device described in the utility model;
Fig. 5 is the splitter box structural representation vertical view of nutrient solution automatic detection device described in the utility model;
Fig. 6 is the signal preprocessor structural representation of nutrient solution automatic detection device described in the utility model.
Embodiment
Nutrient solution automatic detection device described in the utility model, its embodiment be as shown in Figure 1: a kind of nutrient solution automatic detection device comprises and detects groove 1, detection means, signal preprocessor 5, data acquisition unit 6 and signal processing circuit 7; Signal processing circuit 7 has input interface and output interface.Detection means connects signal preprocessor 5, data acquisition unit 6 successively; Data acquisition unit 6 connects signal processing circuit 7 by input interface; The parameter signal of telecommunication of the nutrient solution that the detection means that receives signal preprocessor 7 and handle detects, data acquisition unit 6 is gathered the parameter signal of telecommunication of the nutrient solution after signal preprocessor 5 is handled and is delivered to signal processing circuit 7, the parameter signal of telecommunication that signal processing circuit 7 is handled nutrient solution draws the concentration parameter of nutrient solution, is exported by output interface.
Detection means is arranged in and detects the parameter signal of telecommunication that groove 1 detects the nutrient solution of groove 1, and detection means comprises ion-selective electrode 2, ion reference electrode 3 and temperature sensor 4; Ion-selective electrode 2, ion reference electrode 3 are arranged in temperature sensor 4 and detect groove 1, and ion-selective electrode 2, ion reference electrode 3 are connected signal preprocessor 5 with temperature sensor 4; Temperature sensor 4 can also directly connect signal processing circuit 7 by input interface.
Output interface can connect output peripheral equipment, comprises display 9, data logger 10 and/or printer 11.
Output inserts can connect external input device, comprises keyboard 8, also can connect mouse and/or digitizer.
As shown in Figure 2: described detection groove 1 comprises feed tube 12, baffle plate 13, liquid outlet 14 and cell body 15; Baffle plate 13 is arranged in cell body 15 cell body 15 is divided into feed liquor district 16 and the 17 liang of parts in test section; Feed tube 12 is located at feed liquor district 16 on one side; Liquid outlet 14 is positioned on cell body 15 side plates on 17 tops, test section; Be provided with the slit between baffle plate 13 bottoms and cell body 15 base plates.
Adopt the reason of this design to be, carrying out online ion concentration when detecting, requiring nutrient solution is to flow an end feed liquor, other end fluid at a slow speed.In order to guarantee certain liquid height, make things convenient for electrode measurement, the liquid outlet 14 of outlet end should have certain altitude.This detection groove 1 has a problem, is exactly that nutrient solution may only flow away from liquid level, does not pass through the middle and lower part of solution.Also just say, detect in the groove 1, the liquid of middle and lower part not mobile (or flow velocity is extremely slow).Detecting electrode just can not correctly detect the variation of actual liquid parameter like this.In order to address this problem, adopt such scheme, add a baffle plate 13 in the centre of detecting groove 1, force nutrient solution to flow through from the bottom of detecting groove 1.By this structure, can allow detecting electrode detect the nutrient solution of circulation, guarantee the correct of detection.
In addition, for having interelectrode interference between the different detecting electrodes, therefore, it is necessary that each group detecting electrode is separately measured.The detection groove 1 that can adopt so as shown in Figure 3.Test section 17 is provided with one or more dividing plates 18 test section 17 is divided into two or more independent tests district 19, and each independent test district 19 is respectively equipped with a liquid outlet 14.The feed liquor district 16 of detecting groove 1 also can be provided with one or more dividing plates 18 test section 16 is divided into two or more independent feed liquors district 20, and each independent feed liquor district 20 is respectively equipped with a feed tube 12; Independent feed liquor district 20 is corresponding one by one with independent test district 19.This structure can guarantee the abundant circulation of nutrient solution, makes again respectively to organize separately measurement of electrode, avoids interpolar to disturb.The size of each little lattice all is 5 * 10 * 15 (cm
3).The about 10cm of ion-selective electrode, for the top that guarantees electrode is in the middle part of nutrient solution, our fluid hole is opened at high 12cm place.The structural design of this detection groove 1 has a problem, with 13 fens multichannel feed liquors of a feed tube, causes each road feed tube 13 liquid flow inconsistent, therefore can adopt as accompanying drawing 4 and splitter box shown in Figure 5.The splitter box middle part is provided with flow distribution plate 21 splitter box is divided into two partly, and some is connected with total feed tube 22, and another partly connects described a plurality of feed tube 12; Be provided with the slit between flow distribution plate 21 bottoms and shunting cell body base plate.Owing to have only a total feed tube 22, use this groove structure can make liquid branch multichannel.By overflowing the mode fluid, can make current even.But because feed tube 12 is positioned at the middle part, under its impact, drain pipe 12 flow velocitys in the middle of can making are very fast, and drain pipe 12 flow velocitys of both sides are lower.So add flow distribution plate 21 at the middle part of groove, the current of drain pipe 12 are relatively steadily with even.The just corresponding nutrient solution of its multichannel liquid outlet 12 detects a plurality of independent feed liquor district 20 of groove 1.
The detection method of using above-mentioned nutrient solution automatic detection device is:
At first, signal detection device is placed standard liquid, record electrode output voltage signal relevant under the different temperatures and corresponding temperature signal, and carry out conventional processing and conversion with ion concentration, send into then in the signal processing circuit, according to fitting process accounting temperature compensation formula progressively:
M＝10
a′+b′t+(c′+d′t)V
In parameter, and the temperature-compensating formula that this parameter is stored in the corresponding software of signal processing circuit, obtains demarcating; Secondly, the detection head of signal detection device is placed detected solution, record electrode output voltage signal relevant under the different temperatures and corresponding temperature signal with ion concentration, and carry out conventional processing and conversion, send in the signal processing circuit then, directly calculate actual ion concentration numerical value according to the temperature-compensating formula demarcated again, and this ion concentration value is transferred on data display equipment and/or logger, other external equipments.
Perhaps: at first, the temperature-compensating formula that the parameter of having demarcated is stored in the corresponding software of signal processing circuit, obtains demarcating; Secondly, the detection head of signal detection device is placed detected solution, record electrode output voltage signal relevant under the different temperatures and corresponding temperature signal with ion concentration, and carry out conventional processing and conversion, send in the signal processing circuit then, directly calculate actual ion concentration numerical value according to the temperature-compensating formula of having demarcated, and this ion concentration value is transferred on display and/or logger, other external equipments.
Ion-selective electrode and reference electrode thereof insert in the detected solution, they constitute an electrochemical system (being equivalent to chemical cell): formed a current potential E relevant with ion concentration by measured ion with the selective membrane generation electrochemical reaction of ion-selective electrode, reference electrode then remains a stable current potential E0, ion-selective electrode and reference electrode thereof are as the two poles of the earth of chemical cell, and its output voltage V=E-E0 is relevant with the ion concentration and the temperature of detected solution.Under stationary temperature, the relation between this output voltage and the tested ion concentration meets this special principle of energy, therefore voltage signal can be converted to the ion concentration signal; But when temperature changed, variation had just taken place in the relation between its output voltage and the tested ion concentration.
In electrochemical theory, the chemical reaction that takes place in galvanic cell is:
aA+bB+…+ne?cC+dD+…
Then the Nernst equation expression is:
Directly using the ion concentration in the Nernst equation analytical solution not only very difficult, also is unnecessary, because a lot of to the factor of each parameter generating disturbance in the equation.The present invention proposes, and with the independent variable of temperature variable as the ion-selective electrode response model, the method by modeling is compensated.Can obtain following conclusion through a large amount of experiments, promptly the coefficient of ion concentration logarithm and voltage initial value parameter all can be approximately the once linear function about temperature, the ion-selective electrode model after can obtaining thus simplifying:
V＝a+bt+(c+dt)logM ……………………(1)
V is the electrode output voltage in the formula, and M is an ion concentration, and a, b, c and d are undetermined coefficient.If with temperature and electrode output voltage is independent variable, the ion concentration logarithm is a dependent variable, the then approximate following formula that obtains:
logM＝a′+b′t+(c′+d′t)V ………………………(2)
As long as calibrate a in the formula, b ', c ' and d ', the ion concentration measurement model can be represented by following temperature-compensating formula so:
M＝10
a′+b′t+(c′+d′t)V ……………(3)
Concrete parameter a, b ', c ' and the d ' that is adopted in the temperature-compensating formula should demarcate according to concrete detected solution type and selected ion-selective electrode and reference electrode thereof.
Scaling method is:
Be taken to few two parts with by the identical concentration known standard liquid of measured ion, under at least two kinds of temperature, measure its concrete signal of telecommunication relevant, calculate parameter in the required temperature-compensating formula by the data that measure and following demarcating steps (progressively fitting process is called in letter) then with ion concentration and temperature.
Step 1: the standard liquid of preparing certain concentration, by changing the temperature of solution, obtain one group under (at least two temperature spots) this concentration the electrode output voltage and the relation data between the temperature, change the concentration of standard liquid then, measure the electrode output voltage of standard liquid under another concentration and the relation of temperature.If measured the n group altogether, and obtain a data set ET thus.
Step 2: adopt this data set of least square fitting ET, obtain the straight line set:
{l
i?|V＝a
i+b
it，i＝1，2，3…n.}
By the straight line set that said method is set up, we can obtain the relation between certain temperature bottom electrode output voltage and the concentration logarithm.
Step 3: based on ion-selective electrode electrochemical theory and measured data analysis, set of curves concentration (logarithm)---voltage characteristic under can well the match different temperatures.So the matched curve under the different temperatures (being provided with m temperature) constitutes a straight line set again:
{k
i|D＝e
i+f
iV，i＝1，2，3…m}
Wherein: D is the logarithm value of solution ion concentration, and V is that (be the electrode output voltage, unit: mV), i is the subscript corresponding with series of temperature for the potential difference of ion-selective electrode and its reference electrode.
Step 4: each bar straight line intercept e in the straight line set
lWith corresponding temperature T
lConstitute sample to (e
l, T
l) and the set in each bar straight slope f
lWith corresponding temperature T
lConstitute sample to (f
i, T
l), they are all linear.By method of least squares they are carried out match, can obtain a, b ', c ' and d ' in the formula (3) after the match, thereby determine the concrete temperature-compensating formula of demarcating.For selected ion-selective electrode and reference electrode thereof, after once demarcating, can use continuously.
Concrete computational process can be finished by the corresponding software that is stored in the signal processing circuit 7, and the operator can be as the case may be, by operation keyboard 10 input relevant parameters or instructions, makes the nutrient solution automatic checkout system finish function corresponding.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (10)
1, a kind of nutrient solution automatic detection device is characterized in that, comprises detecting groove, detection means, signal preprocessor, data acquisition unit and signal processing circuit; Signal processing circuit has input interface and output interface; Detection means is arranged in and detects the parameter signal of telecommunication that groove detects the nutrient solution of groove, and detection means connects signal preprocessor, data acquisition unit successively; Data acquisition unit connects signal processing circuit by input interface; The parameter signal of telecommunication of the nutrient solution that the detection means that receives signal preprocessor and handle detects, data acquisition unit is gathered the parameter signal of telecommunication of the nutrient solution after signal preprocessor is handled and is delivered to signal processing circuit, the parameter signal of telecommunication of signal processing circuit processing nutrient solution draws the concentration parameter of nutrient solution, is exported by output interface.
2, nutrient solution automatic detection device according to claim 1 is characterized in that, described detection groove comprises feed tube, baffle plate, liquid outlet and cell body; Baffle plate is arranged in cell body cell body is divided into feed liquor district and test section two parts; Feed tube is located at the feed liquor district on one side; Liquid outlet is positioned on the cell body side plate on top, test section; Be provided with the slit between baffle plate bottom and cell body base plate.
3, nutrient solution automatic detection device according to claim 2, it is characterized in that, the test section of described detection groove is provided with one or more dividing plates the test section is divided into two or more independent tests district, and each independent test district is provided with a liquid outlet respectively.
4, nutrient solution automatic detection device according to claim 3, it is characterized in that, the feed liquor district of described detection groove is provided with one or more dividing plates the test section is divided into two or more independent feed liquors district, and each independent feed liquor district is provided with a feed tube respectively; Independent feed liquor district is corresponding one by one with the independent test district.
5, nutrient solution automatic detection device according to claim 4, it is characterized in that described a plurality of feed tube front ends are splitter box, the splitter box middle part is provided with flow distribution plate splitter box is divided into two partly, some is connected with total feed tube, and another partly connects described a plurality of feed tube; Be provided with the slit between flow distribution plate bottom and shunting cell body base plate.
6, nutrient solution automatic detection device according to claim 1 is characterized in that, described detection means comprises ion-selective electrode, ion reference electrode and temperature sensor; Ion-selective electrode, ion reference electrode and temperature sensor are arranged in and detect groove, and ion-selective electrode, ion reference electrode are connected signal preprocessor with temperature sensor; Temperature sensor can also directly connect signal processing circuit by input interface.
7, nutrient solution automatic detection device according to claim 1, it is characterized in that, described signal preprocessor is a differential amplifier circuit, comprise three amplifiers, the first order is made up of two one-level amplifiers, ion-selective electrode and ion reference electrode connect the positive pole of two one-level amplifiers, and the negative pole of two one-level amplifiers is adjusted the resistance series connection by one; Output termination two utmost point amplifier input terminal of two one-level amplifiers, the output termination data acquisition unit of two utmost point amplifiers.
8, nutrient solution automatic detection device according to claim 7 is characterized in that, described signal preprocessor also comprises low-pass filter circuit, and low-pass filter circuit is a RC network; Low-pass filter circuit is connected in the positive interpolar of ion-selective electrode, ion reference electrode and two one-level amplifiers.
9, nutrient solution automatic detection device according to claim 1 is characterized in that, described output interface can connect output peripheral equipment, comprises display, data logger and/or printer.
10, nutrient solution automatic detection device according to claim 1 is characterized in that, described output interface can connect external input device, comprises keyboard, mouse and/or digitizer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201106565U CN2807764Y (en) | 2005-06-24 | 2005-06-24 | Nutrient solution automatic detection instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201106565U CN2807764Y (en) | 2005-06-24 | 2005-06-24 | Nutrient solution automatic detection instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424779A (en) * | 2015-12-09 | 2016-03-23 | 北京农业智能装备技术研究中心 | Nutrient solution ion concentration online detection device and ion-selective electrode calibration method |
| CN106872646A (en) * | 2017-02-23 | 2017-06-20 | 佛山市融信通企业咨询服务有限公司 | A kind of tissue culture culture medium Nutrition monitoring method |
| CN107490601A (en) * | 2017-04-27 | 2017-12-19 | 安徽华脉科技发展有限公司 | A kind of soilless culture nutrient fluid polyion concentration detection system |
| WO2018196169A1 (en) * | 2017-04-28 | 2018-11-01 | 深圳前海弘稼科技有限公司 | Nutrient solution distribution device and method for monitoring concentration of nutrient solution |
-
2005
- 2005-06-24 CN CNU2005201106565U patent/CN2807764Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424779A (en) * | 2015-12-09 | 2016-03-23 | 北京农业智能装备技术研究中心 | Nutrient solution ion concentration online detection device and ion-selective electrode calibration method |
| CN106872646A (en) * | 2017-02-23 | 2017-06-20 | 佛山市融信通企业咨询服务有限公司 | A kind of tissue culture culture medium Nutrition monitoring method |
| CN107490601A (en) * | 2017-04-27 | 2017-12-19 | 安徽华脉科技发展有限公司 | A kind of soilless culture nutrient fluid polyion concentration detection system |
| WO2018196169A1 (en) * | 2017-04-28 | 2018-11-01 | 深圳前海弘稼科技有限公司 | Nutrient solution distribution device and method for monitoring concentration of nutrient solution |
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Granted publication date: 20060823 |