Dynamic adjustment method, storage medium and system for soilless culture irrigation nutrient solution formula

Abstract

The present invention relates to the field of crop cultivation technology, and in particular to a method, storage medium and system for dynamically adjusting the formula of a soilless cultivation irrigation nutrient solution. The dynamic adjustment method includes the following steps: obtaining irrigation solution and return solution after being absorbed by crops; obtaining the EC value, pH value and ion content of various elements in the irrigation solution and return solution; standardizing the EC value and the ion content of various elements to obtain the comparative value of the irrigation solution and return solution at the same EC value; and dynamically adjusting the concentration of the irrigation solution according to the comparative value. By comparing the changes in the content of each nutrient element in the irrigation solution and the return solution, the absorption and utilization rules of the crops can be understood, and the formula can be adjusted in time to meet the changes in the needs of the crops, create the best water and fertilizer environment, improve the fertilizer utilization rate, and enhance the production capacity of the crops. The dynamic adjustment method can be dynamically adjusted for different crops in soilless cultivation and different growth periods of the same crop, and has the characteristics of being fast, timely and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of crop cultivation, and in particular to a method, a storage medium and a system for dynamically adjusting a formula of a soilless cultivation irrigation nutrient solution. Background Art

[0002] Vegetable cultivation has transformed from traditional extensive open-field cultivation to intensive facility cultivation. Soilless cultivation is the most effective technical measure to prevent soil continuous cropping obstacles, block the spread of pests and diseases, improve water and fertilizer utilization, increase yield and quality, and meet year-round needs.

[0003] In soilless cultivation, the nutrients needed by crops depend on the irrigation nutrient solution, so the types and proportions of elements in the irrigation nutrient solution play an important role in the growth of crops. When the irrigation nutrient solution is consistent with the needs of crops, it can not only improve the yield and quality, but also improve the utilization rate of fertilizers and achieve economical production. On the contrary, it not only fails to reflect the advantages of facility cultivation, but also brings huge waste. In existing soilless cultivation, it is impossible to adjust the demand for nutrient elements in the nutrient solution in time, resulting in problems such as low fertilizer utilization rate and excess nutrition.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method, storage medium and system for dynamically adjusting the formula of soilless culture irrigation nutrient solution, aiming to solve the problem that the existing soilless culture technology cannot timely adjust the demand for nutrient elements in the nutrient solution, resulting in low fertilizer utilization rate.

[0006] The technical solution of the present invention is as follows:

[0007] A method for dynamically adjusting the formula of a soilless culture irrigation nutrient solution comprises the following steps:

[0008] Obtain irrigation liquid and return liquid after being absorbed by crops;

[0009] Obtain the EC value, pH value and HCO3 in the irrigation solution and the return solution - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content;

[0010] The EC value and the ion content of various elements are standardized to obtain comparative values ​​of the irrigation solution and the return solution at the same EC value;

[0011] The concentration of the irrigation fluid is dynamically adjusted according to the comparison value.

[0012] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the step of standardizing the EC value and the ion content of various elements comprises:

[0013] Will Na + Content is converted from mg / L to mmol:

[0014] The molar content of sodium ions in the return liquid is Na 回mmol =Na 回mg / L ÷23;

[0015] The molar content of sodium ions in the irrigation fluid is Na 灌mmol =Na 灌mg / L ÷23;

[0016] Calculate Na + Contribution to the stated EC value, in mS / cm:

[0017] The contribution of sodium ions in the return liquid is EC 回Na =Na 回mmol ×0.1;

[0018] The contribution of sodium ions in the irrigation solution is EC 灌Na =Na 灌mmol ×0.1;

[0019] Among them, Na 回mmol The unit is mmol, which indicates the content of sodium ions in the return liquid; Na 回mg / L The unit is mg / L, which indicates the content of sodium ions in the return liquid; Na 灌mmol The unit is mmol, indicating the content of sodium ions in the irrigation solution; Na 灌mg / L The content of sodium ions in the irrigation solution is expressed in mg / L.

[0020] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the step of obtaining the comparative value of the irrigation solution and the return solution at the same EC value comprises:

[0021] The return liquid and the irrigation liquid remove Na + EC value after:

[0022] EC 回-Na =EC 回 -EC 回Na ;

[0023] EC 灌-Na =EC 灌 -EC 灌Na ;

[0024] The measured values ​​of each element in the return liquid are converted into a comparison value B with the irrigation liquid回i ;

[0025]

[0026] Among them, i 回 Indicates the measured value of any element in the return liquid; EC 回 Indicates the EC value of the backflow liquid; EC 灌 Indicates the EC value of the irrigation solution.

[0027] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the step of dynamically adjusting the concentration of the irrigation solution according to the comparison value comprises:

[0028] The element difference C between the irrigation liquid and the return liquid is obtained by using the comparison value i ;

[0029] According to the element difference C i Dynamically adjusting the concentration of the irrigation fluid;

[0030] The element difference

[0031] Among them, i 灌 represents the measured value of any element in the irrigation solution; the element difference C i A positive value indicates that the content of the return liquid is higher than that of the irrigation liquid by a percentage, and a negative value indicates that the content of the return liquid is lower than that of the irrigation liquid by a percentage.

[0032] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the element difference C i When (%) is between -10% and 10%, the concentration of the irrigation solution is not adjusted;

[0033] The element difference C i (%) is less than -10%, press -(B 回i -i 灌 )×adjustment coefficient to increase the concentration of the irrigation solution;

[0034] The element difference C i (%) is higher than 10%, press (B 回i -i 灌 )×adjustment factor to reduce the concentration of the irrigation solution.

[0035] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the adjustment coefficient is between 0.2 and 0.3.

[0036] The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution, wherein the NO3 -and the NH4 - The mass ratio is greater than 10.

[0037] The method for dynamically adjusting the formula of soilless culture irrigation nutrient solution, wherein the nutrient elements in the irrigation solution come from irrigation water, pH regulator and fertilizer; the irrigation water is alkaline water or acidic water; the pH regulator is selected from one of nitric acid and potassium hydroxide.

[0038] A storage medium stores one or more programs, which can be executed by one or more processors to implement the steps in the method for dynamically adjusting the formula of soilless culture irrigation nutrient solution.

[0039] A dynamic adjustment system for a soilless culture irrigation nutrient solution formula comprises a processor, which is suitable for implementing various instructions; and a storage medium, which is suitable for storing multiple instructions, wherein the instructions are suitable for the processor to load and execute the steps in the soilless culture irrigation nutrient solution formula dynamic adjustment method.

[0040] Beneficial effect: The present invention provides a method, storage medium and system for dynamically adjusting the formula of soilless culture irrigation nutrient solution. The method comprises the steps of obtaining irrigation solution and return solution after being absorbed by crops; obtaining EC value, pH value and HCO3 in the irrigation solution and the return solution; - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content; the EC value and the ion content of various elements are standardized to obtain the comparative value of the irrigation liquid and the return liquid at the same EC value; the concentration of the irrigation liquid is dynamically adjusted according to the comparative value. The present invention compares the changes in the content of each nutrient element in the irrigation liquid and the return liquid to understand the absorption and utilization rules of the crop, adjusts the formula in time to meet the changes in the demand of the crop, creates the best water and fertilizer environment, improves the utilization rate of fertilizers, and thus improves the production capacity of the crop. The dynamic adjustment method can be dynamically adjusted for different crops in soilless cultivation and different growth periods of the same crop, and has the characteristics of being fast, timely and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic flow chart of a method for dynamically adjusting a formula of a soilless culture irrigation nutrient solution according to the present invention;

[0042] Figure 2 The present invention is a schematic diagram of the implementation of a method for dynamically adjusting the formula of a soilless culture irrigation nutrient solution. DETAILED DESCRIPTION

[0043] The present invention provides a method, storage medium and system for dynamically adjusting the formula of a soilless culture irrigation nutrient solution. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0045] Due to the lack of relevant technology, soilless cultivation leads to waste of water and fertilizer, low yield and quality, and insignificant benefits. In order to avoid pipe blockage, soilless cultivation has higher requirements for water and fertilizer. In most cases, water needs to be finely filtered and fertilizers need to reach industrial grade; compared with soil cultivation, the growth range of the root system of soilless cultivation is greatly limited. An unreasonable nutrient solution formula will quickly reflect on the growth of crops, resulting in growth inhibition, deformity, yellow leaves and other nutrient deficiency symptoms. Therefore, timely adjustment of the nutrient solution formula is a necessary condition for high yield and high quality of soilless cultivation.

[0046] Based on this, Figure 1 As shown, the present invention provides a method for dynamically adjusting the formula of a soilless culture irrigation nutrient solution, comprising the steps of:

[0047] Step S10: obtaining irrigation liquid and return liquid after being absorbed by crops;

[0048] Step S20: Obtaining the EC value, pH value and HCO3 in the irrigation liquid and the return liquid - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content;

[0049] Step S30: standardizing the EC value and the ion content of various elements to obtain comparative values ​​of the irrigation solution and the return solution at the same EC value;

[0050] Step S40: dynamically adjusting the concentration of the irrigation fluid according to the comparison value.

[0051] In this embodiment, the present invention obtains the EC value (conductivity), pH value and HCO3 in the irrigation liquid and the return liquid after being absorbed by the crop. - NH4- 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content, compare the changes in the content of each nutrient element in the irrigation liquid and the return liquid, understand the absorption and utilization rate of the crop, and then obtain the comparative value of the irrigation liquid and the return liquid at the same EC value by standardizing the EC value and the ion content of various elements, and use the comparative value to timely adjust the concentration of the irrigation liquid to meet the changes in crop demand, create the best water and fertilizer environment, and thus improve the production capacity of the crop. In addition, the dynamic adjustment method can timely meet the changes in the demand for nutrient elements of crops in different growth periods, give full play to the growth potential of crops, save water and fertilizer, improve the yield variety, significantly improve the yield quality of crops, and improve economic benefits.

[0052] It should be noted that when the crops are just planted, the return liquid at this time is not representative due to the slow growth of the crops and the adsorption and desorption of the substrate; the step S10 of obtaining the irrigation liquid and the return liquid after the crops have absorbed it should be performed after the crops enter the rapid growth period. In addition, the irrigation liquid needs to be sampled at multiple points in the planting area.

[0053] Specifically, Figure 2 As shown, the irrigation nutrient solution is first collected in the irrigated planting area, and then the irrigation nutrient solution is transported to the crop planting area for irrigation by means of irrigation equipment. The return liquid is collected in the planting area or the return liquid pool, and is packaged and tested separately to obtain the EC value, pH value and HCO3 in the irrigation liquid and the return liquid. - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content; then the obtained EC value and the ion content of various elements are processed, specifically standardized; then the difference in element content in the irrigation solution and the return solution is compared, the increase or decrease value of each element (i.e., adjustment value) is calculated, and a new formula, i.e., a new irrigation nutrient solution, is obtained.

[0054] In some embodiments, the basic formula of the irrigation liquid can be selected with the help of professional books, impurities and other literature materials, and the formula closest to the plant variety, the irrigation water used, etc. can also be used as the basic formula with reference to the formula provided in this embodiment. The specific element content is shown in Table 1:

[0055] Table 1

[0056]

[0057] Among them, nitrogen includes ammonium nitrogen and nitrate nitrogen, and the nitrate nitrogen may come from nitric acid for adjusting the pH value; the mass ratio of the nitrate nitrogen to the ammonium nitrogen is greater than 10; phosphorus is calculated as P2O5, potassium is calculated as K2O, and the others are calculated as element content.

[0058] In some embodiments, the irrigation liquid is obtained by collecting the irrigation liquid dripping from the planting area; the return liquid absorbed by the crops can be collected from the return liquid collection point.

[0059] In some embodiments, in step S20, the EC value, pH value and HCO3 in the irrigation solution and the return solution are obtained by an existing element detection method. - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content, so as to accurately obtain the EC value, pH value and ion content of each element in the irrigation liquid and the return liquid. In addition, the irrigation liquid and the return liquid are analyzed by the same method, so that the results are comparable.

[0060] In some embodiments, in step S30, the step of standardizing the EC value and the ion content of various elements includes:

[0061] Step S31: Na + Content is converted from mg / L to mmol:

[0062] The molar content of sodium ions in the return liquid is Na 回mmol =Na 回mg / L ÷23;

[0063] The molar content of sodium ions in the irrigation fluid is Na 灌mmol =Na 灌mg / L ÷23;

[0064] Step S32: Calculate Na + Contribution to the stated EC value, in mS / cm:

[0065] The contribution of sodium ions in the return liquid is EC 回Na =Na 回mmol ×0.1;

[0066] The contribution of sodium ions in the irrigation solution is EC 灌Na =Na 灌mmol ×0.1;

[0067] Among them, Na 回mmol The unit is mmol, which indicates the content of sodium ions in the return liquid; Na 回mg / LThe unit is mg / L, which indicates the content of sodium ions in the return liquid; Na 灌mmol The unit is mmol, indicating the content of sodium ions in the irrigation solution; Na 灌mg / L The content of sodium ions in the irrigation solution is expressed in mg / L.

[0068] In some embodiments, in step S30, the step of obtaining a comparison value of the irrigation fluid and the return fluid at the same EC value comprises:

[0069] The return liquid and the irrigation liquid remove Na + EC value after:

[0070] EC 回-Na =EC 回 -EC 回Na ;

[0071] EC 灌-Na =EC 灌 -EC 灌Na ;

[0072] The measured values ​​of each element in the return liquid are converted into a comparison value B with the irrigation liquid 回i ;

[0073]

[0074] Among them, i 回 Indicates the measured value of any element in the return liquid; EC 回 Indicates the EC value of the backflow liquid; EC 灌 Indicates the EC value of the irrigation solution.

[0075] In this embodiment, the contents of various elements in the irrigation liquid and the return liquid are standardized so that the comparison is performed at the same EC level, which can increase the validity of the results. By comparing the differences in the contents of various nutrient elements in the irrigation liquid and the return liquid, the absorption of the crop can be understood, and the concentration of nutrient elements in the irrigation liquid can be adjusted. The rules of element absorption and utilization by crops in different growth stages are reflected in the differences between the irrigation liquid and the return liquid collected at different times, thereby achieving dynamic adjustment of the nutrient solution formula.

[0076] Specifically, when the concentration of a certain element in the return solution is higher than that in the irrigation solution, it means that the crop absorbs less and should be appropriately reduced.

[0077] In some embodiments, the step of dynamically adjusting the concentration of the irrigation fluid according to the comparison value comprises:

[0078] The element difference C between the irrigation liquid and the return liquid is obtained by using the comparison value i ;

[0079] According to the element difference C i Dynamically adjusting the concentration of the irrigation fluid;

[0080] The element difference

[0081] Among them, i 灌 represents the measured value of any element in the irrigation solution; the element difference C i A positive value indicates that the content of the return liquid is higher than that of the irrigation liquid by a percentage, and a negative value indicates that the content of the return liquid is lower than that of the irrigation liquid by a percentage.

[0082] Due to sampling accidents and analytical errors, when the element difference C i Adjustment is performed only when a certain degree is reached. In this embodiment, ±10% is used as the adjustment principle.

[0083] In some embodiments, the element difference C i When (%) is between -10% and 10%, the concentration of the irrigation solution is not adjusted;

[0084] The element difference C i (%) is less than -10%, press -(B 回i -i 灌 )×adjustment coefficient to increase the concentration of the irrigation solution;

[0085] The element difference C i (%) is higher than 10%, press (B 回i -i 灌 )×adjustment factor to reduce the concentration of the irrigation solution.

[0086] Since the amount of soilless culture effluent (return liquid) is generally 20% to 30% of the irrigation liquid, the adjustment value of the irrigation liquid needs to be multiplied by an adjustment coefficient of 0.2 to 0.3.

[0087] In some embodiments, the adjustment coefficient is between 0.2 and 0.3.

[0088] In a preferred implementation, the adjustment coefficient is 0.2 or 0.3; more preferably, the adjustment coefficient is 0.3.

[0089] In some embodiments, the NO3 - and the NH4 - The mass ratio is greater than 10.

[0090] In some embodiments, the nutrient elements in the irrigation solution come from irrigation water, pH regulator and fertilizer; the irrigation water is alkaline water or acidic water; the pH regulator is selected from one of nitric acid and potassium hydroxide. The adjustment of the soilless culture irrigation nutrient solution formula dynamic adjustment method is ultimately reflected in the adjustment of the fertilizer formula, but the chemical properties of the irrigation water directly affect the properties and dosage of the pH regulator, and then affect the fertilizer formula, so the irrigation water must have stable chemical properties. For alkaline water, nitric acid (HNO3) is selected as the pH regulator, which increases the nitrate nitrogen (NO3 - ) content; for acidic water, potassium hydroxide (KOH) is selected as the pH regulator to increase the potassium (K) content in the irrigation solution. After deducting the element content carried by the irrigation water itself and the element content increased by the pH regulator, the remainder is supplemented by fertilizer.

[0091] Specifically, pH adjusters and HCO3 - The content is mainly used to regulate nitrate nitrogen (NO3 - ) and ammonium nitrogen (NH4 - ) ratio, when pH is high, HCO3 - When the content is high, reduce the ratio of nitrate nitrogen to ammonium nitrogen; when the pH is low, HCO3 - When the content is low, increase the ratio of nitrate nitrogen:ammonium nitrogen.

[0092] In some embodiments, after the concentration of the irrigation solution is adjusted by the soilless culture irrigation nutrient solution formula dynamic adjustment method, it takes a process for it to be reflected on the crops. Therefore, it should take about a week to obtain the irrigation solution again after the adjustment and the return liquid after the crop absorbs it. Since the EC value, pH value and HCO3 in the irrigation solution and the return liquid are obtained, it is necessary to adjust the concentration of the irrigation solution and the soilless culture irrigation nutrient solution formula dynamic adjustment method. - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content also takes time, so the adjustment period of the dynamic adjustment method is about 2 weeks, preferably 2 weeks.

[0093] In addition, the present invention also provides a storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution.

[0094] In addition, the present invention also provides a dynamic adjustment system for the formulation of soilless cultivation irrigation nutrient solution, including a processor, suitable for implementing various instructions; and a storage medium, suitable for storing multiple instructions, wherein the instructions are suitable for being loaded by the processor and executing the steps in the dynamic adjustment method of the formulation of soilless cultivation irrigation nutrient solution.

[0095] The following examples are further given to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention.

[0096] Example 1

[0097] The field test was conducted in the No. 2 glass greenhouse of Green Harbor Agricultural Science and Technology Park, No. 1 Buzhang Road, Sucheng District, Suqian City, Jiangsu Province. The test crop was tomato, and the variety was Aiji 158. The test substrate was coconut bran strips, 1 meter long, 18 cm wide, and about 8 cm high after swelling with water absorption. Planting was carried out on October 22, 2019, and the seedlings were pulled out on June 27, 2020.

[0098] The experiment set up two treatments for comparison. Treatment 1 was the same basic formula of the irrigation solution, and treatment 2 was the irrigation solution adjusted according to the dynamic adjustment method of the soilless culture irrigation nutrient solution formula of the present invention. The first sampling was carried out in the fourth week after planting, and the first formula adjustment was carried out one week later. It was carried out every two weeks thereafter.

[0099] The experiment was repeated three times, and the plot area was 290m 2 352 plants were planted in each plot, and except for the different irrigation nutrient solutions, other management methods were exactly the same.

[0100] The test results are shown in Table 2

[0101] Table 2

[0102] project Process 1 Process 2 Yield per plant (kg / plant) 11.02 12.49 Soluble solids (%) 4.53 4.96

[0103] From the above table, we can see that through timely adjustment of the formula, the yield and variety have been greatly improved.

[0104] In summary, the present invention provides a method, storage medium and system for dynamically adjusting the formula of a soilless culture irrigation nutrient solution. The method comprises the steps of: obtaining irrigation solution and return solution after being absorbed by crops; obtaining the EC value, pH value and HCO3 in the irrigation solution and the return solution; - NH4 - 、NO3 -, P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content; the EC value and the ion content of various elements are standardized to obtain the comparative value of the irrigation liquid and the return liquid at the same EC value; the concentration of the irrigation liquid is dynamically adjusted according to the comparative value. The present invention compares the changes in the content of each nutrient element in the irrigation liquid and the return liquid to understand the absorption and utilization rules of the crop, adjusts the formula in time to meet the changes in the demand of the crop, creates the best water and fertilizer environment, improves the utilization rate of fertilizers, and thus improves the production capacity of the crop. The dynamic adjustment method can be dynamically adjusted for different crops in soilless cultivation and different growth periods of the same crop, and has the characteristics of being fast, timely and reliable.

[0105] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for dynamically adjusting the formula of a soilless culture irrigation nutrient solution, characterized in that: Includes steps: Obtain irrigation liquid and return liquid after being absorbed by crops; Obtain the EC value, pH value and HCO3 in the irrigation fluid and the return fluid - NH4 - 、NO3 - , P, K, Ca, Mg, S, Fe, Zn, Cu, Mn, B, Mo, Cl and Na ion content; The EC value and the ion content of various elements are standardized to obtain comparative values ​​of the irrigation solution and the return solution at the same EC value; dynamically adjusting the concentration of the irrigation fluid according to the comparison value; The step of standardizing the EC value and the ion content of various elements comprises: Will Na + Content is converted from mg / L to mmol: The molar content of sodium ions in the return liquid is Na 回mmol =Na 回mg / L ÷23; The molar content of sodium ions in the irrigation fluid is Na 灌mmol =Na 灌mg / L ÷23; Calculate Na + Contribution to the stated EC value, in mS / cm: The contribution of sodium ions in the return liquid is EC 回Na =Na 回mmol ×0.1; The contribution of sodium ions in the irrigation solution is EC 灌Na =Na 灌mmol ×0.1; Among them, Na 回mmol The unit is mmol, which indicates the content of sodium ions in the return liquid; Na 回mg / L The unit is mg / L, which indicates the content of sodium ions in the return liquid; Na 灌mmol The unit is mmol, indicating the content of sodium ions in the irrigation solution; Na 灌mg / L The content of sodium ions in the irrigation solution is expressed in mg / L.

2. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 1, characterized in that: The step of obtaining a comparison value of the irrigation fluid and the return fluid at the same EC value comprises: The return liquid and the irrigation liquid remove Na + EC value after: EC 回-Na =EC 回 -EC 回Na ; EC 灌-Na =EC 灌 -EC 灌Na ; The measured values ​​of each element in the return liquid are converted into a comparison value B with the irrigation liquid 回i ; Among them, i 回 Indicates the measured value of any element in the return liquid; EC 回 Indicates the EC value of the backflow liquid; EC 灌 Indicates the EC value of the irrigation solution.

3. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 2, characterized in that: The step of dynamically adjusting the concentration of the irrigation fluid according to the comparison value comprises: The element difference C between the irrigation liquid and the return liquid is obtained by using the comparison value i ; According to the element difference C i Dynamically adjusting the concentration of the irrigation fluid; The element difference Among them, i 灌 represents the measured value of any element in the irrigation solution; the element difference C i A positive value indicates that the content of the return liquid is higher than that of the irrigation liquid by a percentage, and a negative value indicates that the content of the return liquid is lower than that of the irrigation liquid by a percentage.

4. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 3, characterized in that: The element difference C i When (%) is between -10% and 10%, the concentration of the irrigation solution is not adjusted; The element difference C i (%) is less than -10%, press -(B 回i -i 灌 )×adjustment coefficient to increase the concentration of the irrigation solution; The element difference C i (%) is higher than 10%, press (B 回i -i 灌 )×adjustment factor to reduce the concentration of the irrigation solution.

5. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 4, characterized in that: The adjustment coefficient is between 0.2 and 0.

3.

6. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 1, characterized in that: The NO3 - and the NH4 - The mass ratio is greater than 10.

7. The method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution according to claim 1, characterized in that: The nutrient elements in the irrigation liquid come from irrigation water, pH regulator and fertilizer; the irrigation water is alkaline water or acidic water; the pH regulator is selected from one of nitric acid and potassium hydroxide.

8. A storage medium, characterized in that: The storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the method for dynamically adjusting the formula of the soilless culture irrigation nutrient solution as described in any one of claims 1-7.

9. A dynamic adjustment system for the formulation of soilless culture irrigation nutrient solution, characterized in that: It includes a processor, which is suitable for implementing various instructions; and a storage medium, which is suitable for storing multiple instructions, wherein the instructions are suitable for being loaded by the processor and executing the steps in the method for dynamically adjusting the formula of the soilless cultivation irrigation nutrient solution as described in any one of claims 1-7.

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