Method for determining allowable phosphate fertilizer application surplus of regional wheat

Abstract

The invention discloses a method for determining the allowable phosphate fertilizer application surplus of regional wheat, and relates to the technical field of agriculture. The method comprises the following steps: obtaining the phosphate fertilizer yield increase of regional wheat according to field experiment data; constructing a regression relationship between the phosphate fertilizer applying amount and the yield increasing amount; establishing a linear relationship between the phosphorus application amount and the phosphorus apparent equilibrium amount; the data range of phosphorus partial nutrient balance is determined based on the phosphate fertilizer yield increment of regional wheat, and then the phosphorus application amount range is obtained; and according to the relationship between the phosphorus application amount and the phosphorus apparent equilibrium amount, determining the range value of the phosphorus apparent equilibrium amount, namely the allowable phosphorus application surplus amount of the regional wheat, and obtaining the allowable phosphorus fertilizer application surplus amount of the regional wheat after data conversion. According to the method, while the wheat yield is guaranteed, phosphorite resources are saved and utilized to the maximum extent, and feasible measures are provided for intensive management of phosphate fertilizer.

Description

Technical Field

[0001] The invention relates to the field of agricultural technology, and in particular to a method for determining the allowable surplus amount of phosphate fertilizer application for wheat in a region. Background Art

[0002] Wheat is a crop with high phosphorus demand. The application of phosphorus fertilizer is an important measure to maintain wheat growth and ensure wheat yield. However, many survey results show that there is a serious problem of excessive phosphorus application in wheat-growing areas. The long-term excessive application of fertilizers has weakened the effect of fertilization on wheat yield increase, and also caused problems such as low fertilizer utilization rate, waste of fertilizer resources, and environmental risks caused by fertilizer loss. As a mineral resource, the non-renewable nature of phosphorus fertilizer has also led to a continuous decrease in reserves. With the continuous mining of phosphate mines, phosphate reserves are expected to be exhausted within the next 100 years. Phosphorus is an important component of the reproduction of organisms, especially in promoting wheat tillering and increasing starch content. Therefore, advocating reasonable phosphorus application is very important for increasing and stabilizing wheat yields and sustainable development of agriculture. The traditional practice of relying on large amounts of phosphorus fertilizer to increase wheat yields is unsustainable. The accumulation of phosphorus in the soil has led to a continuous decrease in the yield-increasing effect of wheat phosphorus application in some areas, and even the phenomenon of no increase in yield due to phosphorus fertilizer application. In addition, the environmental pollution problem caused by phosphorus fertilizer lost through runoff and other channels has attracted widespread attention.

[0003] Phosphorus fertilizers applied to the soil are easily fixed by mineral adsorption and chemical precipitation, so excessive application of phosphorus fertilizers will not have a sustained effect on increasing production. High phosphorus surpluses lead to the continuous accumulation of phosphorus in agricultural soils. 71% of the world's cultivated land area has an overall phosphorus surplus. The current recovery rate of phosphorus fertilizers in the season is less than 20%, and phosphorus surplus has become normalized. Excessive phosphorus fertilizers are combined with soil and sediments and will not be absorbed by plants in the short term. Soil phosphorus accumulation greatly increases the risk of phosphorus loss, which will have long-term impacts on the environment. If you want to maintain the apparent balance of phosphorus between the soil-plant system and improve the utilization rate of phosphorus fertilizers, you need to reduce the amount of phosphorus applied to the phosphorus balance or below, so as to significantly reduce soil phosphorus accumulation and phosphorus loss in high-phosphorus soils, but the premise is to ensure that crop yields do not decrease.

[0004] By improving phosphorus utilization efficiency and thus reducing phosphorus fertilizer input, it will have a very high driving effect on the world phosphorus cycle. Controlling the amount of phosphorus fertilizer applied to the apparent phosphorus balance level of the soil-plant system and determining the allowable surplus range of phosphorus fertilizer are important ways to solve the problem of excessive application of phosphorus fertilizer and fixed losses, and are also an indispensable and primary task in phosphorus fertilizer management. Determining the allowable phosphorus surplus range based on crop yield increment and phosphorus fertilizer recovery rate is of great significance to increasing crop yields, economical use of phosphorus fertilizers, reducing environmental point source and non-point source pollution caused by phosphorus fertilizer losses, and promoting the sustainable development of agriculture. Summary of the invention

[0005] The purpose of the present invention is to provide a method for determining the allowable surplus amount of phosphate fertilizer application for regional wheat, so as to solve the problems existing in the above-mentioned prior art.

[0006] Wheat is a crop with high phosphorus demand, and the application of phosphorus fertilizer is a necessary measure to ensure wheat yield. Due to the low water solubility and low volatility of phosphorus, it is often adsorbed and deposited in the soil in the form of mineral salts, resulting in farmers inputting far more phosphorus fertilizer than the crop needs. Crops need sufficient phosphorus in the early stages of growth, which plays a decisive role in crop yield. However, the negative effect of excessive phosphorus fertilizer input on yield cannot be ignored. Improving the utilization efficiency of residual phosphorus in the soil is an important part of the sustainable use of agricultural phosphorus. At present, the phenomenon of excessive phosphorus application in wheat is extremely common. Under the premise of ensuring crop yield, it is extremely important to manage phosphorus fertilizer based on crop yield response, that is, the yield increase efficiency after the application of phosphorus fertilizer. Some methods are used to activate phosphorus in the soil, such as adding phosphate-solubilizing bacteria, phosphorus activators, etc. to accelerate the transformation of residual phosphorus and increase phosphorus effectiveness. These methods have played a role in activating soil phosphorus to a certain extent, but they only play a mitigating role. Reducing the application of phosphorus fertilizer from the source is the best treatment method.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides a method for determining the allowable surplus amount of phosphate fertilizer application for wheat in a region, comprising the following steps:

[0009] S1. Based on the field experiment data, obtain the regional wheat phosphate fertilizer yield increase data, that is, the yield increment of phosphate fertilizer;

[0010] Field experiment data requirements: the same plot contains the yields of treatments with and without phosphate fertilizer application; the amount of phosphate fertilizer applied and the wheat yield are clear; except for the different amounts of phosphate fertilizer applied, other measures including planting patterns and farmland management are consistent;

[0011] Based on the yield of the phosphorus application treatment and the yield of the non-phosphorus application treatment, the quantitative relationship between the phosphorus application and non-phosphorus application yields was established through formula (1): (the phosphorus application treatment refers to the full application of nitrogen, phosphorus and potassium, and the non-phosphorus application treatment is different from the phosphorus application treatment only in that no phosphorus fertilizer is applied);

[0012] Y0=a×Y (1);

[0013] In formula (1), Y represents the yield obtained under phosphorus fertilizer application, which is the treatment with the highest yield among the phosphorus fertilizer application treatments; Y0 represents the yield of the treatment without phosphorus fertilizer application; a is a coefficient, which represents the ratio of the yield of the treatment without phosphorus fertilizer application to the yield of the treatment with phosphorus fertilizer application;

[0014] The yield-increasing efficiency of wheat after applying phosphorus fertilizer can be calculated by formula (1):

[0015] YOΔ =(1-a)×100 (2);

[0016] In formula (2), Y OΔ It indicates the yield increase rate (%) under the optimized application of phosphorus fertilizer;

[0017] S2. Construct the relationship between the amount of phosphorus applied and the yield increase of phosphorus fertilizer;

[0018] Calculate the yield increase rate under different phosphorus application rates:

[0019] Y Δ =(Y-Y0)÷Y0×100(3);

[0020] In formula (3), Y Δ represents the yield increase rate (%) under different phosphorus application rates, Y represents the yield with phosphorus fertilizer application, and Y0 represents the yield without phosphorus fertilizer application;

[0021] We can further obtain the relationship between the amount of phosphorus applied and the yield increase of phosphorus fertilizer:

[0022] Y Δ =b×F P 2 + c×F P +d (4);

[0023] In formula (3), F P represents the amount of phosphorus applied; b, c, d are coefficients;

[0024] Formula (3) can be used to calculate the increase in phosphorus yield and the corresponding amount of phosphorus applied under this increase;

[0025] The amount of phosphorus applied under the yield increase rate obtained by equations (1) and (2) can be further calculated;

[0026] S3. Establishing a linear relationship between the amount of phosphorus applied and the apparent balance of phosphorus; the apparent balance of phosphorus is the difference between the amount of phosphorus applied and the amount of phosphorus removed by the crop;

[0027] Phosphorus apparent balance (P Δ ) is calculated as:

[0028] P Δ =F P -R p (5);

[0029] In formula (5), P Δ represents the apparent balance of phosphorus; F P Indicates the amount of phosphorus applied; R p It represents the phosphorus removal of crops, which is the nutrient removal of wheat aboveground parts and the sum of nutrient absorption of grains and straw;

[0030] Build P Δand F P Linear relationships between parameters;

[0031] P Δ =e×F P +f(6);

[0032] In formula (6), P Δ represents the apparent balance of phosphorus; F P represents the amount of phosphorus applied; e is the coefficient; f is the constant;

[0033] S4. Data range for determining phosphorus nutrient balance based on regional wheat phosphorus fertilizer yield increment:

[0034] According to the regression relationship in S2, the amount of phosphorus applied under the optimal yield increment in S1 is obtained, and then the optimal apparent phosphorus balance is obtained according to the relationship in S3; the apparent phosphorus balance is the difference between the amount of phosphorus applied and the amount of phosphorus removed by the crop, and the amount of phosphorus removed by the crop is obtained;

[0035] The optimal PNB-P was calculated according to the following formula;

[0036] PNB-P=R p ÷F P ;

[0037] In the formula, PNB-P represents the partial nutrient balance of phosphorus, R p represents the amount of phosphorus removed by crops, F P Indicates the amount of phosphorus applied;

[0038] If the optimal PNB-P>1.0, adjust the upper limit of PNB-P to 1.0 and the lower limit to 0.8;

[0039] If 0.8<optimal PNB-P<1.0, adjust the lower limit of PNB-P to 0.8, and keep the upper limit unchanged;

[0040] If the optimal PNB-P is less than 0.8, adjust the upper limit of PNB-P to 0.8, and keep the lower limit unchanged;

[0041] Among them, the upper limit corresponds to the minimum amount of phosphorus applied, and the lower limit corresponds to the maximum amount of phosphorus applied;

[0042] S5. The phosphorus application amount range is obtained according to the formula in step S4 based on the data range of the phosphorus partial nutrient balance determined in S4;

[0043] S6. According to the relationship between the amount of phosphorus applied and the apparent balance of phosphorus in step S3, the range of the apparent balance of phosphorus is determined, that is, the allowable surplus amount of phosphorus application for wheat in the region;

[0044] S7. The regional wheat allowable phosphorus fertilizer surplus amount obtained in step S6 is converted into the phosphorus fertilizer usage in production practice to obtain the regional wheat allowable phosphorus fertilizer surplus amount.

[0045] The present invention also provides a system for determining the allowable surplus amount of phosphate fertilizer application for regional wheat, comprising: a memory and a processor, wherein the memory stores a computer program run by the processor, and when the computer program is run by the processor, the system executes the method for determining the allowable surplus amount of phosphate fertilizer application for regional wheat as described above.

[0046] The present invention further provides a storage medium having a computer program stored thereon, and when the computer program is run, the method for determining the allowable surplus amount of phosphate fertilizer application for wheat in the above-mentioned region is executed.

[0047] The present invention discloses the following technical effects:

[0048] The present invention proposes a method for determining the allowable surplus amount of phosphate fertilizer application for regional wheat, so as to solve the problem that the existing fertilization method of phosphate fertilizer application is unscientific, and while ensuring the wheat yield, the phosphate resources are utilized in the most economical way, providing a feasible measure for the intensive management of phosphate fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a relationship diagram for determining the yield-increasing effect of wheat yield after phosphorus application in Example 1 of the present invention;

[0051] Figure 2 This is a relationship diagram for determining the amount of phosphorus applied to wheat and the yield increment in Example 1 of the present invention;

[0052] Figure 3 This is a relationship diagram for determining the phosphorus application amount and the apparent phosphorus balance of wheat in Example 1 of the present invention. DETAILED DESCRIPTION

[0053] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0054] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0055] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0056] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0057] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0058] The data requirements for calculating the yield increase rate of phosphate fertilizer in the embodiment of the present invention are: the same plot contains yields of treatments with and without phosphate application; there are clear phosphate application amounts and wheat yields; except for the different phosphate application amounts, other measures including planting patterns, farmland management and other measures are consistent.

[0059] Example 1

[0060] (1) Collect and summarize field test data in the northern part of the study area and the Yangtze River Basin, including:

[0061] All test data come from field tests, including tests on different phosphate fertilizer dosages, 3414 tests, and tests on recommended phosphate fertilizer dosages. The test data include phosphate fertilizer dosage, wheat yield, and phosphate absorption in treatments with and without phosphate fertilizer.

[0062] The yield-increasing effect of phosphorus fertilizer application in each region was calculated, among which: the treatment with the highest total nitrogen, phosphorus and potassium yield among all treatments was used to optimize fertilization yield.

[0063] A linear relationship was used to simulate the relationship between the yield of full application of nitrogen, phosphorus and potassium fertilizers and the yield without application of phosphorus fertilizers in the north and the Yangtze River Basin, such as Figure 1 ,in:

[0064] North: y = 0.886x;

[0065] Yangtze River Basin: y = 0.837x;

[0066] Among them, x is the wheat yield with full application of nitrogen, phosphorus and potassium, and y is the wheat yield without phosphorus application;

[0067] Further, the yield-increasing effect of phosphate fertilizer is calculated, where:

[0068] North = (1-0.886) × 100 = 11.4%;

[0069] Yangtze River Basin = (1-0.837) × 100 = 16.3%;

[0070] (2) The quadratic curve model was used to simulate the relationship between phosphorus application and wheat yield increment (e.g. Figure 2 ),in:

[0071] This part of the data contains the data of each phosphorus fertilizer application amount and the corresponding yield increase, and the relationship is:

[0072] North: y = -0.002x 2 +0.3534x+0.9641;

[0073] Yangtze River Basin: y = -0.005x 2 +0.6674x+0.5214;

[0074] In this formula, y is the yield increment after phosphorus application, and x represents the amount of phosphorus fertilizer applied;

[0075] Furthermore, the amount of phosphorus applied under the optimal yield increment obtained in step (1) can be calculated, where:

[0076] In the north: 37.5 kg P / ha;

[0077] Yangtze River Basin: 30.7 kg P / ha;

[0078] (3) A linear relationship is used to simulate the relationship between the amount of phosphorus applied and the apparent phosphorus balance, where:

[0079] The apparent balance of phosphorus is the difference between the amount of phosphorus applied and the amount of phosphorus removed, where:

[0080] The amount of phosphorus removed is the accumulated nutrients in the aboveground part. The phosphorus content in straw is low, the mineralization amount in the season is small, and the effectiveness is low, so the nutrients in straw are classified as phosphorus removed.

[0081] The relationship between phosphorus application rate and apparent phosphorus balance is as follows: Figure 3 ,in:

[0082] North: y = 0.9124x-32.885;

[0083] Yangtze River Basin: y = 0.845x-16.995;

[0084] In this formula, y is the apparent balance of phosphorus, and x represents the amount of phosphorus applied;

[0085] Furthermore, the apparent balance of phosphorus under the optimal yield increment obtained in step 1 can be obtained, where:

[0086] In the north: 1.3 kg P / ha;

[0087] Yangtze River Basin: 8.9 kg P / ha;

[0088] (4) The rationality of the phosphorus application amount obtained in step (2) is determined based on the partial nutrient balance of phosphorus (PNB-P). First, the phosphorus removal amount is calculated. The calculation formula is: the difference between the phosphorus application amount and the nutrient balance amount, where:

[0089] The apparent phosphorus balance in the north and the Yangtze River Basin is positive, so the phosphorus removal is:

[0090] North: 37.5-1.3 = 36.2 kg P / ha;

[0091] Yangtze River Basin: 30.7-8.9 = 21.8 kg P / ha;

[0092] Furthermore, the PNB-P of the North and Yangtze River Basin under the production increment of step 1 can be calculated, where:

[0093] North: 36.2÷37.5=0.96;

[0094] Yangtze River Basin: 21.8÷30.7=0.71;

[0095] (5) The amount of phosphorus applied was adjusted according to the PNB value. Since the PNB-P of wheat in the northern region was between 0.8 and 1.0, the lower limit of the PNB-P of wheat in the northern region was adjusted to 0.8, which corresponded to the upper limit of phosphorus application. The PNB-P of wheat in the Yangtze River Basin was less than 0.8, so the upper limit of the PNB-P of wheat in the Yangtze River Basin was adjusted to 0.8, which corresponded to the lower limit of phosphorus application, that is, the amount of phosphorus removed was 80% of the amount of phosphorus applied, and the phosphorus surplus (phosphorus apparent balance) at this time was equivalent to 0.2 times the amount of phosphorus applied (i.e. 1-0.8=0.2);

[0096] Therefore, the upper limit of phosphorus application in the northern region and the lower limit of phosphorus application in the Yangtze River Basin are calculated according to the formula in step (3), where:

[0097] In the north: 32.885÷(0.9124-0.2)=46.2kg P / ha;

[0098] Yangtze River Basin: 16.995÷(0.845-0.2)=26.4kg P / ha;

[0099] Furthermore, it can be concluded that the range of phosphorus application in different regions under the optimized phosphorus fertilizer utilization rate range, that is, the PNB-P range in the northern region is between 0.8-0.96, and the PNB-P range in the Yangtze River Basin is between 0.71-0.80, among which:

[0100] In the north: 37.5-46.2 kg P / ha;

[0101] Yangtze River Basin: 26.4-30.7 kg P / ha;

[0102] (6) Based on the range of phosphorus application obtained in step (5), according to the formula in step (3), the allowable phosphorus surplus under the optimized phosphorus fertilizer utilization rate range, that is, PNB-P in the northern region is between 0.8-0.97 and PNB-P in the Yangtze River Basin is between 0.71-0.80, where:

[0103] In the north: 1.3-9.3 kg P / ha;

[0104] Yangtze River Basin: 5.3-8.9 kg P / ha;

[0105] Furthermore, this range of usage is converted into the actual usage in production practice, that is, elemental phosphorus is converted into oxides and multiplied by the coefficient 2.292, and the allowable surplus amount of phosphorus fertilizer is:

[0106] In the north: 3.0-21.3 kg P2O5 / ha;

[0107] Yangtze River Basin: 12.1-20.4kg P2O5 / ha;

[0108] In the main wheat producing areas in the north and the Yangtze River Basin, two scenarios, customary fertilization and optimized fertilization, were set up with customary fertilization as the control to verify the rationality of the phosphate fertilizer surplus range, including wheat yield, phosphorus application rate, phosphorus absorption and PNB-P under different fertilization scenarios.

[0109] Table 1

[0110]

[0111] Table 1 shows the effects of different fertilization scenarios on phosphorus application, yield, phosphorus absorption and PNB-P in the northern region and the Yangtze River Basin. From the results of the field test, it can be seen that the phosphorus application of conventional fertilization has a serious problem of excessive application. The PNB-P of wheat in the northern region and the Yangtze River Basin is only 0.59 and 0.67, respectively, both lower than the lower limit obtained, and the phosphorus fertilizer surplus exceeds the upper limit of the allowable surplus, reaching 29.7 and 6.6 kg P2O5 / ha respectively; and the phosphorus application of optimized fertilization shows that compared with conventional fertilization, it not only reduces the phosphorus fertilizer application by 24.4% and 14.8% in wheat in the northern region and the Yangtze River Basin, but also increases the yield by 5.7% and 3.9%, respectively, and the PNB-P reaches 0.83 and 0.86, respectively.

[0112] The present invention provides a better range of phosphorus application for growers and agricultural decision makers under the premise of ensuring that the yield increment does not decrease by balancing soil nutrients and crop absorption, which is conducive to the resource utilization of phosphorus. In addition, according to the wheat planting area, it is divided into wheat in the northern region and wheat in the Yangtze River Basin. Formulating a reasonable range of phosphorus application is of great significance to improving phosphorus utilization, protecting the ecological environment and saving resources. For example, the wheat planting area in the Yangtze River Basin of my country has low yield but large rainfall. Compared with the northern region, although its phosphorus application is low, the minimum allowable surplus range is higher than that in the northern region, which is also considered from the actual production situation. However, there is currently no definite range of phosphorus input to improve the productivity of small farmers. The present invention effectively solves this problem and can achieve the maximum economical utilization of phosphate resources, which provides a feasible measure for the intensive management of phosphate fertilizers worldwide.

[0113] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for determining the allowable surplus amount of phosphate fertilizer application for wheat in a region, characterized in that: The following steps are involved: S1. Based on the field experiment data, obtain the regional wheat phosphate fertilizer yield increase data; S2. Construct the relationship between the amount of phosphorus applied and the yield increase of phosphorus fertilizer; S3. Establishing a linear relationship between the amount of phosphorus applied and the apparent balance of phosphorus; the apparent balance of phosphorus is the difference between the amount of phosphorus applied and the amount of phosphorus removed by the crop; S4. Data range for determining phosphorus nutrient balance based on regional wheat yield increase using phosphorus fertilizer: According to the regression relationship in S2, the amount of phosphorus applied under the optimal yield increase in S1 is obtained, and then the optimal apparent phosphorus balance is obtained according to the relationship in S3. The apparent phosphorus balance is the difference between the amount of phosphorus applied and the amount of phosphorus removed by the crop, and the amount of phosphorus removed by the crop is obtained; The optimal PNB-P was calculated according to the following formula; PNB-P=R p ÷F P ; In the formula, PNB-P represents the partial nutrient balance of phosphorus, R p represents the amount of phosphorus removed by crops, F P Indicates the amount of phosphorus applied; If the optimal PNB-P>1.0, adjust the upper limit of PNB-P to 1.0 and the lower limit to 0.8; If 0.8<optimal PNB-P<1.0, adjust the lower limit of PNB-P to 0.8, and keep the upper limit unchanged; If the optimal PNB-P is less than 0.8, adjust the upper limit of PNB-P to 0.8, and keep the lower limit unchanged; Among them, the upper limit corresponds to the minimum amount of phosphorus applied, and the lower limit corresponds to the maximum amount of phosphorus applied; S5. The phosphorus application amount range is obtained according to the formula in step S4 based on the data range of the phosphorus partial nutrient balance determined in S4; S6. According to the relationship between the amount of phosphorus applied and the apparent balance of phosphorus in step S3, the range of the apparent balance of phosphorus is determined, that is, the allowable surplus amount of phosphorus application for wheat in the region; S7. The regional wheat allowable phosphorus fertilizer surplus amount obtained in step S6 is converted into the phosphorus fertilizer usage in production practice to obtain the regional wheat allowable phosphorus fertilizer surplus amount.

2. A system for determining the allowable surplus amount of phosphate fertilizer application for wheat in a region, characterized in that: include: A memory and a processor, wherein the memory stores a computer program to be executed by the processor, and when the computer program is executed by the processor, the method for determining the allowable surplus amount of phosphorus fertilizer application for regional wheat as claimed in claim 1 is executed.

3. A storage medium, characterized in that: The storage medium stores a computer program, which, when running, executes the method for determining the allowable surplus amount of phosphorus fertilizer application for regional wheat as claimed in claim 1.

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