A water and fertilizer application system based on fishpond tail water and its application method

Abstract

A method for proportioning and applying fertilizers based on fishpond tail water, the proportioning and applying system comprising: a control module and a pipeline module; the proportioning and applying method comprising: an initial filling stage and a top-up fertilization stage, wherein the initial filling stage is the process of filling the nutrient solution tank for the first time, and the top-up fertilization stage is the process of replenishing the nutrient solution tank while the nutrient solution in the nutrient solution tank is being used. Both stages are for achieving the preparation of a standard nutrient solution formula. The present invention aims to prepare a standard nutrient solution formula, uses the nitrogen in the fishpond tail water as an alternative source of nitrogen in the nutrient solution, and realizes the automatic proportioning of the standard nutrient solution through the alternative strategy of the present invention. This invention is significantly different from the traditional fertilizer proportioning method that regulates the conductivity based on the PID algorithm, and is an important method for realizing the efficient utilization of fishpond tail water.

Description

Technical Field

[0001] The present invention relates to the field of efficient utilization of aquaculture tail water, and more specifically, to a fertilization method for a water-fertilizer application system based on fishpond tail water. Background Art

[0002] During the process of fish farming, a large amount of fishpond tail water is usually generated. Since fishpond tail water contains nitrogen ions and the like, direct discharge is likely to cause pollution to the soil or water body. However, existing aquaculture tail water utilization systems or devices can only simply mix fertilizers and water and then output them, adjust the conductivity or pH through the PID algorithm, and most of the water used for fertilizer preparation is conventional water, which is mostly applicable to fields and substrates and not applicable to hydroponics. It is impossible to achieve the efficient utilization of fishpond tail water, and the degree of intelligence is relatively low, making it difficult to accurately control problems such as fertilization time, fertilization amount, and fertilization speed. For example, an intelligent water-fertilizer regulation device and method based on the PID algorithm with the patent publication number CN 114208470 A electrically connects a data acquisition unit, a data transmission unit, and a water-fertilizer application control unit, constructs a water-fertilizer ratio model based on a fuzzy neural network PID, controls the water-fertilizer equipment to complete water-fertilizer application, and realizes the precise adjustment of EC and pH, effectively solving the existing technical problems. However, most of the water used for fertilizer preparation is conventional water, and it is impossible to utilize the nutrient elements in fishpond tail water to achieve a win-win situation for the environment and organic farming.

[0003] The nitrogen in fishpond tail water can be used as a substitute for nitrogen fertilizer. However, the nitrogen in fishpond tail water will fluctuate with factors such as fish farming density and production cycle. When using the Yamazaki standard nutrient solution as the standard nutrient solution formula for fertilization, how to achieve the dynamic substitution and application of nitrogen in fishpond tail water has become a technical problem to be solved.

[0004] In summary, there is an urgent need to invent a fertilization method for a water-fertilizer application system based on fishpond tail water. Summary of the Invention

[0005] To improve and even solve at least one problem in the prior art, the present invention proposes a fertilization method for a water-fertilizer application system based on fishpond tail water.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In the first aspect of the present invention: A water-fertilizer application system based on fishpond tail water is provided, and the system includes a control module and a pipeline module, wherein:

[0008] The core components of the control module are the controller and the screen, which are electrically connected to transmit data and for display. The pipeline module includes a water pump, a fertilization channel, and a fertilizer tank. The fertilization channel has a constant number of 4 channels. Channel A is configured for nitrogen fertilizer, Channel B is configured for phosphorus and potassium fertilizers, Channel C is configured for trace elements, and Channel D is for acid adjustment. The water pump is connected to the fertilizer tank through the fertilization channel to achieve the extraction and transportation of fertilizers;

[0009] The control module, acting as the host computer, is responsible for sending operation commands to the pipeline module. Along the flow direction of the fertilizer, the fertilization channel is successively equipped with a rotameter, a flow regulating valve, a solenoid valve, and a Venturi fertilizer applicator;

[0010] The inlet of the Venturi fertilizer applicator is connected to the upstream of the main irrigation pipeline, and its outlet is connected to the inlet of the water pump. The outlet of the water pump is connected to the nutrient solution tank, forming a complete fertilizer mixing link;

[0011] The present invention is further configured as follows: The execution device carrier of the system is a fertilizer applicator.

[0012] In the second aspect of the present invention, a method for water and fertilizer combined application based on fishpond tail water is provided, including the following two stages:

[0013] Initial filling stage: According to the standard nutrient solution formula, obtain the nitrogen concentration A1 (mg / L) of the standard nutrient solution, and obtain the nitrogen concentration A2 (mg / L) of the fishpond tail water through sampling and testing;

[0014] According to the bottom diameter d (cm) and the highest liquid level h max (cm) of the nutrient solution tank, calculate the maximum volume V max (cm 3 ) when the nutrient solution tank is filled, and the calculation formula is as follows:

[0015] V max = 3.14 * d / 2 * d / 2 * h max ;

[0016] According to the maximum volume V max when the nutrient solution tank is filled, the single-channel fertilizer absorption flow rate q (L / h), and the nutrient solution concentration ratio e, calculate the time T 1 (s) of Channels B and C during the initial filling, and the calculation formula is as follows:

[0017] T 1 = V max / (q * 1000 / 3600) / e, where the nutrient solution concentration ratio e is the concentration multiple of the standard nutrient solution formula.

[0018] Based on the nitrogen concentration A1 of the standard nutrient solution formula and the nitrogen concentration A2 of the fishpond tail water, the substitution ratio F is obtained, and the calculation formula is as follows:

[0019] F = A2 / A1;

[0020] Based on the time T of the B channel and the C channel 1 , the time T2 of the A channel is obtained. The substitution algorithm is to use the nitrogen in the fishpond tail water as a nutrient element to replace part of the nitrogen fertilizer. By controlling the same flow rates of the A channel, the B channel, and the C channel, the time T2 of the A channel is controlled to achieve nitrogen fertilizer substitution. The calculation formula is as follows:

[0021] T 2 = T 1 * (1 - F);

[0022] Based on the fertilization channel time T 1 , T 2 the fertilization outlet flow rate Q (L / h) is obtained, and the calculation formula is as follows:

[0023] Q = q 主 + q * 3, where q 主 is the main pipeline inlet flow rate (L / h).

[0024] Based on the fertilization outlet flow rate Q and the maximum volume V when the nutrient solution tank is full max， the total fertilization time T (s) is obtained, and the calculation formula is as follows:

[0025] T = V max / 1000 / Q * 3600;

[0026] Top-up stage: During the usage process after the initial filling stage, based on the conductivity value B of the nutrient solution in the nutrient solution tank monitored in real time by the sensor 1 , the conductivity value B and the EC deviation rate g when the liquid level reaches the highest liquid level h max in the initial filling stage, it is judged whether to start the top-up stage. The calculation formula is as follows:

[0027] If (B - B 1 ) / B < g, no top-up is carried out. If (B - B 1 ) / B ≥ g, the top-up stage is started, and the liquid level depth h 1 at the moment when the conductivity of the nutrient solution is B t is obtained through the liquid level sensor;

[0028] Based on the liquid level depth h t , the highest liquid level h max the volume V to be topped up of the nutrient solution is obtained, and the calculation formula is as follows: 补

[0029] ​V 补 = d / 2 * d / 2 * 3.14 * (h max - h t );

[0030] Based on the volume V when the nutrient solution tank is full 补 , the fertilizer absorption flow rate q of a single channel, and the nutrient solution concentration e, the fertilizer replenishment time T of channels B and C during the first filling is obtained 补1 (s), and the calculation formula is as follows:

[0031] T 补1 = V 补 / (q * 1000 / 3600) / e, where the nutrient solution concentration ratio e is the concentration multiple of the standard nutrient solution formula

[0032] Based on the fertilizer replenishment time T of channels B and C 补1 , the fertilizer replenishment time T of channel A is obtained 补2 , and the calculation formula is as follows:

[0033] T 补2 = T 补1 * (1 - F);

[0034] Based on the fertilization channel time T 补1 、T 补2 , the fertilizer outlet flow rate Q (L / h) during the fertilizer replenishment stage is obtained, and the calculation formula is as follows:

[0035] Q = q 主 + q * 3, where q 主 is the main pipeline inlet water flow rate (L / h).

[0036] Based on the fertilizer outlet flow rate Q 补 , the maximum volume V when the nutrient solution tank is full 补 , the total fertilizer replenishment time T 补 (s) is obtained, and the calculation formula is as follows:

[0037] T 补 = V 补 / 1000 / Q 补 * 3600;

[0038] A further setting of the present invention is: the irrigation sequence is to irrigate fish tail water and fertilizer simultaneously - then irrigate fish tail water again - stop irrigation when the liquid level reaches h max , and the relationship of the final fertilization time is T > T 1 > T 2 .

[0039] A further setting of the present invention is that the flow rate q of the fertilization channel can be manually adjusted according to the fertilization time through a linear valve on the fertilization channel, and the fertilizer absorption amount of each channel should be the same, and the set range of the fertilizer absorption flow rate is 60-160L / h.

[0040] A further setting of the present invention is that in the filling stage, when reaching the highest liquid level h max the default conductivity of the nutrient solution is the standard conductivity of the standard nutrient solution formula.

[0041] A further setting of the present invention is that the alternative algorithm makes full use of the nitrogen in the fish-raising tail water by fixing the flow rate of each fertilization channel and changing the fertilization time of the nitrogen fertilizer channel. The time ratio of channel A to channels B and C is (1-e):1:1.

[0042] A further setting of the present invention is that channels B and C are opened and closed simultaneously.

[0043] A further setting of the present invention is that in the top-up fertilization stage, through the conductivity value of the nutrient solution, the conductivity at the highest liquid level h max is the conductivity of the standard nutrient solution formula, and h t is the liquid level depth when the deviation rate from the conductivity target value EC is less than.

[0044] A further setting of the present invention is that channels A, B, and C achieve the standard nutrient solution formula by controlling time, and channel D uses a positional PID algorithm to achieve the adjustment of the standard nutrient solution pH value. The standard nutrient solution obtained by fertilizer mixing is stored in the nutrient solution tank, and an EC sensor, a pH sensor, and a liquid level sensor are equipped in the nutrient solution tank.

[0045] Beneficial effects: The present invention proposes and applies a new method for water and fertilizer application. Different from the traditional adjustment method that uses conductivity as the control target and realizes fertilizer mixing for multiple fertilization channels based on the PID algorithm, it takes the standard nutrient solution formula as the mixing target, utilizes the nitrogen in the fish-raising tail water as an effective alternative source of inorganic nitrogen fertilizer in the fish-vegetable symbiotic system, reduces the use of fertilizers, and achieves a win-win situation for the environment and organic. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0047] Figure 1 Shows a flowchart of the filling stage of a method for water and fertilizer application based on fish-raising tail water.

[0048] Figure 2 shows a flowchart of the fertilizer replenishment stage of a method for water and fertilizer application based on fishpond tail water.

[0049] Figure 3 shows a connection diagram of a control system for water and fertilizer application based on fishpond tail water.

[0050] Figure 4 shows the liquid level diagram of the nutrient solution tank.

[0051] Among them, 1. main irrigation pipeline; 2. flow regulating valve; 3. solenoid valve; 4. rotameter; 5. venturi fertilizer applicator; 6. fertilizer bucket; 7. water pump; 8. EC sensor; 9. pH sensor; 10. liquid level sensor; 11. nutrient solution tank; 12. control module; h t : liquid level depth at the current moment; h max : highest liquid level. Specific embodiments

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0053] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0054] In the present invention, all embodiments, implementation manners, and features of the present invention can be combined with each other without contradiction or conflict. In the present invention, conventional devices, apparatuses, components, etc. can be either commercially purchased or self-made according to the content disclosed in the present invention. In the present invention, to highlight the key points of the present invention, some conventional operations and devices, apparatuses, components are omitted or only briefly described.

[0055] Embodiment 1:

[0056] The objective of the application embodiment is a water and fertilizer application system based on fishpond tail water. The system includes a control module and a pipeline module, where:

[0057] The control module includes a controller, a screen and supporting electrical components, and the controller is electrically connected to the screen; the pipeline module includes a water pump 7, a fertilization channel and a fertilizer bucket 6, and the water pump is connected to the fertilizer bucket 6 through the fertilization channel;

[0058] The control module, as the upper module of the pipeline module, realizes command issuance;

[0059] Among them, the fertilization channel is sequentially connected with a rotameter 4, a solenoid valve 3, a flow regulating valve 2 and a Venturi fertilizer applicator 5 according to the fertilizer absorption flow direction;

[0060] The inlet of the Venturi fertilizer applicator is connected to the upstream of the main irrigation pipeline 1, and its outlet is connected to the inlet of the water pump. The outlet of the water pump is connected to the nutrient solution tank, forming a complete fertilizer preparation link.

[0061] Example 2:

[0062] In this embodiment of the application, the application of standard Yamazaki nutrient solution is taken as an example:

[0063] It is obtained that the Yamazaki nutrient solution is mainly composed of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer configured according to a certain ratio. Barrel A is configured with nitrogen fertilizer, barrel B is configured with phosphorus and potassium fertilizers, barrel C is configured with trace elements, and barrel D is configured with acid. The original solution concentrations of nitrogen fertilizer, phosphorus and potassium fertilizers, and trace element (Fe) fertilizers are 8700 mg / L, and after being diluted 20 times, the concentrations of nitrogen, phosphorus, potassium and trace element (Fe) in the standard nutrient solution are 435 mg / L. The nitrogen concentration of the fishpond tail water is obtained through the fertilizer efficiency evaluation model as 46 mg / L. According to the conservation of nitrogen element, part of the nitrogen element of the Yamazaki nutrient solution comes from the fishpond tail water, and part comes from the original solution in barrel A.

[0064] Determine the maximum nutrient solution volume according to the nutrient solution tank parameters and the maximum irrigation upper limit.

[0065] Among them, the diameter of the nutrient solution tank is selected as 200 cm, the fertilizer absorption flow rate can be selected as 80 L / h, and the maximum irrigation upper limit is 30 cm;

[0066] Determine the maximum nutrient solution volume Vmax (cm3) according to the nutrient solution tank parameters and the maximum irrigation upper limit. The calculation formula is as follows:

[0067] V max =3.14*d / 2*d / 2*hmax=100*100*3.14*30=942000cm 3 ,

[0068] According to the maximum volume V when the nutrient solution tank is full max, for the single-channel fertilizer absorption flow rate q and the nutrient solution concentration ratio e, when initially filling up, the time T1 (s) for other fertilizer application channels B and C except nitrogen fertilizer is obtained, and the calculation formula is as follows:

[0069] T 1 =V max / (q * 1000 / 3600) / e = 942000 / (80 * 1000 / 3600) / 20 = 2140 s, where the nutrient solution concentration ratio is 20.

[0070] According to the nitrogen concentration A1 of the standard nutrient solution formula and the nitrogen concentration A2 of the fishpond tail water, the substitution ratio F calculation formula is as follows:

[0071] F = A2 / A1 = 46 / 435 = 0.11;

[0072] According to the time T1 of other fertilizer application channels except nitrogen fertilizer, the time T2 of channel A is obtained, and the calculation formula is as follows:

[0073] T 2 =T 1 *(1 - F) = 2140*(1 - 0.11) = 1905 s;

[0074] According to the fertilizer application channel time T 1 、T 2 the fertilizer application outlet flow rate Q (L / h) is obtained, and the calculation formula is as follows:

[0075] Q = q 主 +q * 3 = 1000 + 80 * 3 = 1240 L / h

[0076] In the formula, q 主 is the main pipeline inlet water flow rate (L / h), and the number of fertilizer applicator channels is 3.

[0077] According to the fertilizer application outlet flow rate Q and the maximum volume V when the nutrient solution tank is filled up max， the total fertilizer application time T is obtained, and the calculation formula is as follows:

[0078] T = V max / 1000 / Q * 3600 = 942000 / 1000 / 1240 * 3600 = 2734 s.

[0079] Example 3:

[0080] Top-up stage: During the usage process after the initial filling stage, according to the conductivity value B of the nutrient solution in the nutrient solution tank monitored in real time by the sensor 1 、the obtained highest liquid level h reached in the initial filling stage maxWhen the conductivity value B is between 1.3 and 1.6 and the set EC deviation rate is 10%, it is determined whether to start the topdressing stage. The calculation formula is as follows;

[0081] (1.35 - 1.22) / 1.35 ≥ 10%, start the topdressing stage, where the nutrient solution conductivity obtained by the liquid level sensor is B 1时刻 The liquid level depth h t is 26 cm;

[0082] According to the liquid level depth h t , the highest liquid level h max , the volume V of the nutrient solution to be supplemented is obtained 补 , and the calculation formula is as follows:

[0083] V 补 = 3.14 * d / 2 * d / 2 * (h max - h t ) = 100 * 100 * 3.14 * (30 - 26) = 125600 cm 3 ;

[0084] According to the volume V when the nutrient solution tank is full 补 , the single-channel fertilizer absorption flow rate q = 80 L / h, and the nutrient solution concentration e is the dilution multiple 20. When initially filling up, the time T 补1 (s) of other fertilization channels except nitrogen fertilizer is obtained. The calculation formula is as follows:

[0085] T 补1 = V 补 / (q * 1000 / 3600) / e = 125600 / (80 * 1000 / 3600) / 20 = 282 s;

[0086] According to the time T 补1 of other fertilization channels except nitrogen fertilizer, the time T 补2 of the nitrogen fertilizer channel is obtained. The calculation formula is as follows:

[0087] T 补2 = T 补1 * (1 - F) = 282 * (1 - 0.11) = 251 s;

[0088] According to the fertilization channel time T 补1 , T 补2 , the fertilization outlet flow rate Q 补 (L / h) in the topdressing stage is obtained. The calculation formula is as follows:

[0089] Q 补 = q 主 + q * n = 1000 + 80 * 3 = 1240 L / h,

[0090] Where q 主 is the inlet flow rate of the main pipeline, which is 1000 (L / h), and n is the number of fertilization channels of the fertilizer applicator.

[0091] According to the fertilization outlet flow rate Q 补 , the maximum volume V 补 when the nutrient solution tank is full, the total fertilizer replenishment time T 补 is obtained, and the calculation formula is as follows:

[0092] T 补 =V 补 / 1000 / Q 补 *3600 = 125600 / 1000 / 1240*3600 = 364s.

[0093] Example 4:

[0094] Another object of the embodiment of the present application is to provide a water and fertilizer application control system based on fishpond tail water. The execution device carrier of the control system is a fertilizer applicator.

[0095] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for applying fertilizer to fish tail water based on a water-fertilizer application system, characterized in that: The dispensing system includes: a control module and a pipeline module, wherein: The control module includes a controller and a screen, the controller and the screen are electrically connected to perform data transmission and display, the pipeline module includes a water pump, a fertilization channel, a nutrient solution tank and a fertilization bucket, and the water pump is connected to the fertilization bucket through the fertilization channel; The control module, as a host computer, is responsible for issuing operation commands to the pipeline module. The fertilization channel is sequentially installed with a float flowmeter, a solenoid valve, a flow regulating valve and a Venturi fertilizer applicator according to the flow direction of the fertilizer. The inlet of the Venturi fertilizer applicator is connected to the main irrigation pipeline, and its outlet is connected to the inlet of the water pump; the outlet of the water pump is connected to the nutrient solution tank; The fertilization channels are 4 channels, namely channel A, channel B, channel C, and channel D. Channel A is configured with nitrogen fertilizer, channel B is configured with phosphorus and potassium fertilizers, channel C is configured with trace elements, and channel D is configured with acid adjustment; The fertilization method includes: an initial filling stage and a supplementary fertilization stage. The initial filling stage is the process of filling the nutrient solution tank for the first time, and the supplementary fertilization stage is the process of supplementing the nutrient solution tank while the nutrient solution in the nutrient solution tank is being used. Both stages are for achieving the purpose of preparing a standard nutrient solution formula. The steps of the initial filling phase are: S11. According to the standard nutrient solution formula, obtain the nitrogen concentration A1 (mg / L) of the standard nutrient solution, and obtain the nitrogen concentration A2 (mg / L) of the fish tail water in real time through the sensor; S12. According to the bottom diameter d (cm) of the nutrient solution tank and the highest liquid level h max (cm), calculate the maximum volume V when the nutrient solution tank is filled max (cm 3 ), the calculation formula is as follows: In max =3.14×d / 2×d / 2×h max ; S13. According to the maximum volume V when the nutrient solution tank is filled max , single channel fertilizer absorption flow q (L / h) and nutrient solution concentration ratio e, calculate the time T1 (s) of channel B and channel C when first filled, the calculation formula is as follows: T1=V max / (q×1000 / 3600) / e, wherein the nutrient solution concentration ratio e is the concentration multiple of the standard nutrient solution formula; S14. According to the nitrogen concentration A1 of the standard nutrient solution formula and the nitrogen concentration A2 of the fish tail water, the substitution ratio F is obtained. The substitution ratio calculation formula is as follows: F=A2 / A1; S15. According to the time T1 of the B channel and the C channel, the time T2 of the A channel is obtained, and the flow rates of the A channel, the B channel, and the C channel are controlled to be the same, and the time T2 (s) of the A channel is controlled to achieve nitrogen fertilizer substitution. The calculation formula is as follows: T2 = T1 × (1-F); S16. Calculate the fertilizer outlet flow rate Q (L / h) according to time T1 and T2. The calculation formula is as follows: Q=q 主 +q×3, where q 主 is the water inlet flow rate of the main pipeline (L / h); S17. According to the fertilization outlet flow Q, the maximum volume V when the nutrient solution tank is filled max， The total fertilization time T(s) is calculated as follows: T=V max / 1000 / Q×3600; The steps of the fertilization stage are: S21. According to the conductivity value B1 of the nutrient solution in the nutrient solution tank monitored in real time by the sensor during use after the initial filling stage, the liquid level in the initial filling stage reaches the maximum liquid level h max The conductivity value B and EC deviation rate g at that time are used to determine whether to start the fertilizer supplementation stage. The calculation formula is as follows: If (B-B1) / B<g, no fertilization is performed. If (B-B1) / B≥g, the fertilization stage is started. The nutrient solution conductivity is obtained by the liquid level sensor at the liquid level depth h at the moment B1. t ; S22. According to the liquid level depth h t , the maximum liquid level h max , calculate the volume V of the nutrient solution 补 , the calculation formula is as follows: V 补 =3.14×d / 2×d / 2×(h max -h t ); S23. According to the volume V when the nutrient solution tank is filled 补 , the fertilizer absorption flow rate q of the single channel, the nutrient solution concentration ratio e, and the fertilizer replenishment time T of the B channel and the C channel when filled. 补1 (s), the calculation formula is as follows: T 补1 =V 补 / (q×1000 / 3600) / e; S24. According to the B channel, C channel fertilizer time T 补1 , find the fertilizer replenishment time T of the A channel 补2 , the calculation formula is as follows: T 补2 =T 补1 ×(1-F); S25. According to time T 补1 , T 补2 , and obtain the fertilizer outlet flow Q during the supplementary fertilizer stage 补 (L / h), the calculation formula is as follows: Q 补 =q 主 +q×3, where q 主 is the water inlet flow rate of the main pipeline (L / h); S26. According to the fertilization outlet flow Q 补 , the maximum volume V when the nutrient solution tank is full 补 , calculate the total fertilizer supplementation time T 补 (s), the calculation formula is as follows: T 补 =V 补 / 1000 / Q 补 ×3600。 2. The method for applying water and fertilizer based on the fish farming tail water according to claim 1, characterized in that: The irrigation sequence is: irrigate with fish tail water and fertilizer at the same time - then irrigate with fish tail water - the liquid level reaches h max Stop filling.

3. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: The flow rate of the fertilization channel can be manually adjusted according to the fertilization time through the flow regulating valve on the fertilization channel. The fertilizer absorption flow rate of each channel must be the same, and the fertilizer absorption flow rate setting range is 60-160L / h.

4. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: During the initial filling phase, the maximum liquid level h is reached max The default nutrient solution conductivity is the standard conductivity of the standard nutrient solution formula.

5. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: By fixing the flow rate of each fertilization channel and changing the fertilization time of channel A, the nitrogen in the fish tail water can be fully utilized. The time ratio of channel A to channel B and channel C is (1-e):1:

1.

6. The method for applying water and fertilizer based on the fish farming tail water according to claim 5, characterized in that: The A channel, the B channel, and the C channel are started at the same time, and the B channel and the C channel are started and closed at the same time.

7. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: During the fertilizer supplementation stage, the maximum liquid level h max The electrical conductivity at this time is the electrical conductivity of the standard nutrient solution formula.

8. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: The A channel, the B channel, and the C channel realize the standard nutrient solution formula by controlling the time, and the D channel adopts the position PID algorithm to realize the pH adjustment of the standard nutrient solution. The standard nutrient solution obtained by fertilizer preparation is stored in the nutrient solution tank, and the nutrient solution tank is equipped with an EC sensor, a pH sensor, and a liquid level sensor.

9. The method for applying fertilizer to fish tail water according to claim 1, characterized in that: The executive equipment carrier of the fertilizer distribution system is a fertilizer spreader.

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