Method for determining a regional corn allowance for phosphorus fertilizer application surplus

Abstract

The application discloses a method for determining the surplus amount of phosphorus fertilizer application for regional corn, and relates to the technical field of agriculture. The method comprises the following steps: obtaining the yield increment of phosphorus fertilizer for regional corn according to field experiment data; constructing the regression relationship between the amount of applied phosphorus and the yield increment; establishing the linear relationship between the amount of applied phosphorus and the apparent balance amount of phosphorus; determining the data range of phosphorus nutrient imbalance based on the yield increment of phosphorus fertilizer for regional corn, and then obtaining the range of the amount of applied phosphorus; determining the range value of the apparent balance amount of phosphorus according to the relationship between the amount of applied phosphorus and the apparent balance amount of phosphorus in the step, which is the surplus amount of phosphorus application for regional corn; and obtaining the surplus amount of phosphorus fertilizer application for regional corn after data conversion. The application can guarantee the yield of corn and achieve the maximum saving of phosphorus ore resources, and provides a feasible measure for the intensive management of phosphorus fertilizer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural technology, in particular to a method for determining the allowable surplus amount of phosphorus fertilizer application for regional corn. BACKGROUND

[0002] Phosphorus, as a widely used mineral resource, is one of the important nutrients for maintaining crop growth in agricultural production. As a component of phospholipids, cell membranes, proteins and other substances in biological organisms, phosphorus participates in nucleic acid formation, ATP energy transfer and transformation, plays a key role in accelerating tillering of cereal crops, increasing grain starch content, improving crop quality and increasing crop yield. Therefore, phosphorus is one of the key factors restricting crop yield. However, as a non-renewable resource, the global annual mining amount is as high as 22 Mt. With the continuous mining of phosphorus ore, the phosphorus ore reserves are expected to be exhausted within 100 years in the future. In the future, it is not sustainable to rely on high input of phosphorus fertilizer to meet human demand for food, and the accumulation of phosphorus in soil and the environmental pollution problems caused by loss have attracted widespread attention. The phosphorus fertilizer input into the soil is easily fixed by mineral adsorption and chemical precipitation, so the excessive input of phosphorus fertilizer will not play a role in sustained yield increase. However, considering the low efficiency of phosphorus fertilizer application, farmers usually apply excessive phosphorus fertilizer in agricultural production to ensure crop yield. High phosphorus surplus leads to continuous accumulation of phosphorus in agricultural soil, and 71% of the global arable land area is in a state of overall phosphorus surplus, and excessive phosphorus fertilizer combines with soil and sediment, which will not be absorbed by plants in the short term, and the accumulation of soil phosphorus greatly increases the risk of phosphorus loss, which will have a long-term impact on the environment.

[0003] If the apparent balance state between soil-plant system and phosphorus utilization rate is to be maintained, the soil phosphorus accumulation and phosphorus loss of high phosphorus soil can be greatly reduced by reducing the amount of phosphorus application to the level of phosphorus balance or below, but the premise is to ensure that the crop yield is not reduced, and the key measure is to control the amount of phosphorus fertilizer to a reasonable range. By improving the phosphorus utilization efficiency and reducing the input of phosphorus fertilizer, it will have a high driving benefit for the world phosphorus cycle. Controlling the amount of phosphorus fertilizer 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 and loss of phosphorus fertilizer, and are essential and the first task in phosphorus fertilizer management. Therefore, it is of great significance to determine the allowable phosphorus surplus range based on crop yield increase and phosphorus fertilizer recovery rate to improve crop yield, intensive use of phosphorus fertilizer, reduce environmental point source and non-point source pollution caused by loss of phosphorus fertilizer, and promote the sustainable development of agriculture. SUMMARY

[0004] The purpose of the present application is to provide a method for determining the allowable surplus amount of phosphorus fertilizer application for regional corn to solve the problems existing in the prior art.

[0005] To achieve the above object, the present application provides the following scheme:

[0006] The present application provides a method for determining the surplus amount of phosphorus fertilizer application for regional corn, comprising the following steps:

[0007] S1. According to the field experiment data, the phosphorus fertilizer yield increment data of regional corn, i.e. the yield increment of phosphorus fertilizer, is obtained;

[0008] The field experiment data requirements: the same plot contains phosphorus fertilizer treatment and no phosphorus fertilizer treatment yield; There is a clear amount of phosphorus fertilizer and corn yield; Except for the different amount of phosphorus fertilizer, other measures including planting mode, farmland management and other measures are consistent;

[0009] According to the yield of phosphorus fertilizer treatment and the yield of no phosphorus fertilizer treatment, the quantitative relationship between the yield of phosphorus fertilizer and the yield of no phosphorus fertilizer is established by formula (1): (phosphorus fertilizer treatment is all NPK fertilizer application, and the difference between no phosphorus fertilizer treatment and phosphorus fertilizer treatment is only that no phosphorus fertilizer is applied)

[0010] Y0=a×Y (1);

[0011] In formula (1), Y represents the yield obtained under the application of phosphorus fertilizer, which is the highest yield obtained in the phosphorus fertilizer treatment; Y0 represents the yield of no phosphorus treatment; a is a coefficient, which represents the proportion of no phosphorus yield to phosphorus treatment;

[0012] The yield increment efficiency of corn after applying phosphorus fertilizer can be calculated by formula (1):

[0013] Y OΔ =(1-a)×100 (2);

[0014] In formula (2), Y OΔ represents the yield increment rate (%) under the optimized application of phosphorus fertilizer;

[0015] S2. Construct the relationship between the amount of phosphorus application and the yield increment of phosphorus fertilizer;

[0016] Calculate the yield increment rate under different amounts of phosphorus application:

[0017] Y Δ =(Y-Y0)÷Y0×100 (3);

[0018] In formula (3), Y Δ represents the yield increment rate (%) under different amounts of phosphorus application, Y represents the yield of phosphorus fertilizer, and Y0 represents the yield of no phosphorus fertilizer;

[0019] Further, the relationship between the amount of phosphorus application and the yield increment of phosphorus fertilizer can be obtained:

[0020] Y Δ =b×F P2 + c×F P + d (4);

[0021] In formula (4), F P represents the amount of phosphorus applied; b, c, and d are coefficients;

[0022] The yield increment of phosphorus application and the corresponding amount of phosphorus applied under the increment can be calculated by formula (4);

[0023] The amount of phosphorus applied under the yield increment obtained from formula (1) and formula (2) can be further calculated;

[0024] S3. Establishing a linear relationship between the amount of phosphorus applied and the apparent balance amount of phosphorus; the apparent balance amount of phosphorus is the difference between the amount of phosphorus applied and the amount of phosphorus removed by crops;

[0025] The apparent balance of phosphorus (P Δ ) is calculated as:

[0026] P Δ = F P - R p (5);

[0027] In formula (5), P Δ represents the apparent balance of phosphorus; F P represents the amount of phosphorus applied; and R p represents the amount of phosphorus removed by crops, which is the amount of phosphorus removed by the above-ground parts of corn and the total amount of phosphorus absorbed by grains and straws;

[0028] A linear relationship between P Δ and F P parameters is established;

[0029] P Δ = e×F P + f (6);

[0030] In formula (6), P Δ represents the apparent balance of phosphorus; F P represents the amount of phosphorus applied; e is a coefficient; and f is a constant;

[0031] S4. Determining the data range of phosphorus partial nutrient balance based on the yield increment of regional corn phosphorus fertilizer:

[0032] According to the regression relationship in S2, the amount of phosphorus applied under the optimal yield increment of S1 is obtained, and then according to the relationship in S3, the optimal apparent balance amount of phosphorus is obtained from the amount of phosphorus applied; according to the difference between the amount of phosphorus applied and the amount of phosphorus removed by crops, the amount of phosphorus removed by crops is obtained;

[0033] The optimal PNB-P is calculated according to the following formula:

[0034] PNB-P = Rp ÷F P ;

[0035] wherein, PNB-P represents phosphorus partial nutrient balance, R p represents crop phosphorus removal amount, F P represents phosphorus application amount;

[0036] If the optimal PNB-P>1.0, the upper limit of PNB-P is adjusted to 1.0, and the lower limit is set to 0.8;

[0037] If 0.8<the optimal PNB-P<1.0, the lower limit of PNB-P is adjusted to 0.8, and the upper limit is unchanged;

[0038] If the optimal PNB-P<0.8, the upper limit of PNB-P is adjusted to 0.8, and the lower limit is unchanged;

[0039] Wherein, the upper limit corresponds to the minimum phosphorus application amount, and the lower limit corresponds to the maximum phosphorus application amount;

[0040] S5. The phosphorus partial nutrient balance data range determined in S4 is used to obtain the phosphorus application amount range according to the formula in step S4;

[0041] S6. According to the relationship between the phosphorus application amount and the apparent phosphorus balance amount in step S3, the range value of the apparent phosphorus balance amount is determined, that is, the regional corn allowed phosphorus application surplus amount;

[0042] S7. The regional corn allowed phosphorus application surplus amount obtained in step S6 is converted into the phosphorus fertilizer amount in production practice to obtain the regional corn allowed phosphorus fertilizer application surplus amount.

[0043] The application also provides a system for determining the regional corn allowed phosphorus fertilizer application surplus amount, comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, and the computer program, when executed by the processor, performs the method for determining the regional corn allowed phosphorus fertilizer application surplus amount.

[0044] The application further provides a storage medium, wherein the storage medium stores a computer program, and the computer program, when executed, performs the method for determining the regional corn allowed phosphorus fertilizer application surplus amount.

[0045] The application discloses the following technical effects:

[0046] The application provides a method for determining the regional corn allowed phosphorus fertilizer application surplus amount to solve the problem that the existing fertilization method is not scientific in applying phosphorus fertilizer, ensures the yield of corn, maximizes the saving of phosphate rock resources, and provides a feasible measure for intensive management of phosphorus fertilizer. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only merely some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0048] Figure 1 A relationship diagram for determining the yield increase effect of corn after phosphorus application in Embodiment 1 of the present application;

[0049] Figure 2 A relationship diagram for determining the yield increase of corn and the amount of phosphorus application in Embodiment 1 of the present application;

[0050] Figure 3 A relationship diagram for determining the apparent balance of phosphorus and the amount of phosphorus application in corn in Embodiment 1 of the present application. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but should be understood as a more detailed description of some aspects, characteristics and embodiments of the present application.

[0052] It should be understood that the terms described in the present application are merely for describing the specific embodiments, and are not used to limit the present application. In addition, for the numerical range in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value in the stated range, and any other stated value or intermediate value in the stated range, is also included in the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, preferred methods and materials are described. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict between the content of the specification and that of any document incorporated herein by reference, the content of the specification prevails.

[0054] Various modifications and changes can be made to the specific implementation of the present application described in the specification without departing from the scope or spirit of the application. Other implementations of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application. The specification and examples are illustrative only.

[0055] As used herein, the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or variations thereof, are intended to be open-ended terms that mean including, but not limited to.

[0056] Corn planting area is extensive, and is planted in various regions. Embodiments of the present application are divided into spring corn and summer corn planting areas according to corn planting types, and related embodiments are described.

[0057] Embodiment 1

[0058] (1) Collect and summarize field test data of spring corn and summer corn in the research area, wherein:

[0059] All test data come from field tests, and the field test types include different phosphorus fertilizer application rate tests, 3414 tests, and phosphorus fertilizer recommended application rate tests, etc. The test data include the phosphorus fertilizer application rate of phosphorus fertilizer application and non-phosphorus application, corn yield, and phosphorus uptake;

[0060] Calculate the yield-increasing effect of phosphorus fertilizer application for spring corn and summer corn, wherein: the optimized fertilization yield uses the treatment with the highest yield of nitrogen, phosphorus, and potassium full application among all treatments.

[0061] Use a linear relationship to simulate the relationship between the yield of nitrogen, phosphorus, and potassium full application and the yield of non-phosphorus application for spring corn and summer corn (such as Figure 1 ), wherein:

[0062] Spring corn: y = 0.865x;

[0063] Summer corn: y = 0.897x;

[0064] In this formula, x is the yield of nitrogen, phosphorus, and potassium full application, and y is the yield of non-phosphorus application;

[0065] Further, calculate the yield-increasing effect of phosphorus fertilizer, wherein:

[0066] Spring corn = (1-0.865) x 100 = 13.5%;

[0067] Summer corn = (1-0.897) x 100 = 10.3%;

[0068] (2) Use a quadratic curve model to simulate the relationship between the amount of applied phosphorus and the yield increment of corn (such as Figure 2 ), wherein:

[0069] This part of data includes various phosphorus application amount data and corresponding yield increment, and the relationship formula is:

[0070] Spring corn: y = -0.0031x 2 + 0.4636x + 1.7188;

[0071] Summer corn: y = -0.0039x 2+ 0.5002x + 0.7334;

[0072] In the formula, y is the yield increment of corn after phosphorus application, and x represents the amount of phosphorus application;

[0073] Further, the amount of phosphorus application under the optimal yield increment obtained in step 1 can be obtained, wherein:

[0074] For spring corn: 32.5 kg P / ha;

[0075] For summer corn: 23.4 kg P / ha;

[0076] (3) The relationship between the amount of phosphorus application and the apparent balance of phosphorus is simulated by a linear relationship, wherein:

[0077] The apparent balance of phosphorus is the difference between the amount of phosphorus application and the amount of phosphorus removal, wherein:

[0078] The amount of nutrient removal is the cumulative amount of phosphorus in the aboveground part. The phosphorus content in straw is low, the amount of mineralization in the season is low, and the effectiveness is low, so the nutrient in straw is classified as nutrient removal.

[0079] The relationship between the amount of phosphorus application and the apparent balance of phosphorus is as follows: Figure 3

[0080] For spring corn: y = 0.8937x - 34.141;

[0081] For summer corn: y = 0.8725x - 33.972;

[0082] In the formula, y is the apparent balance of phosphorus, and x represents the amount of phosphorus application;

[0083] Further, the apparent balance of phosphorus under the optimal yield increment obtained in step 1 can be obtained, wherein:

[0084] For spring corn: -5.1 kg P / ha;

[0085] For summer corn: -13.6 kg P / ha;

[0086] (4) The rationality of the amount of phosphorus application obtained in step (2) is determined according to the phosphorus partial nutrient balance (PNB-P). First, the amount of phosphorus removal is calculated, and the calculation formula is: the difference between the amount of phosphorus application and the balance of phosphorus nutrients, wherein:

[0087] The apparent balance of phosphorus for spring corn and summer corn is negative, so the amount of phosphorus removal is:

[0088] For spring corn: 32.5 + 5.1 = 37.6 kg P / ha;

[0089] For summer corn: 23.4 + 13.6 = 37.0 kg P / ha;​

[0090] Further, the PNB-P of spring maize and summer maize under the yield increment of step (1) can be obtained, wherein:

[0091] Spring maize: 37.6 ÷ 32.5 = 1.16;

[0092] Summer maize: 37.0 ÷ 23.4 = 1.58;

[0093] (5) Adjusting the amount of phosphorus applied according to the PNB value, because the PNB-P of spring maize and summer maize is > 1.0, the upper limit of PNB-P is adjusted to 1.0, which corresponds to the lower limit of the amount of phosphorus applied, i.e. the amount of phosphorus removed, wherein:

[0094] Spring maize: 37.6 kg P / ha;

[0095] Summer maize: 37.0 kg P / ha;

[0096] Further, the upper limit of the amount of phosphorus applied for spring maize and summer maize is determined, and the lower limit of PNB-P is set to 0.8, i.e. the amount of phosphorus removed is 80% of the amount of phosphorus applied, at this time the surplus amount of phosphorus (the apparent balance amount of phosphorus) is equivalent to 0.2 times the amount of phosphorus applied (i.e. 1-0.8 = 0.2), and the corresponding amount of phosphorus applied is calculated according to the formula in step (3), wherein:

[0097] Spring maize: 34.141 ÷ (0.8937-0.2) = 49.3 kg P / ha;

[0098] Summer maize: 33.972 ÷ (0.8725-0.2) = 50.5 kg P / ha;

[0099] Further, the range of the amount of phosphorus applied under the optimized phosphorus utilization rate, i.e. the amount of phosphorus applied for spring maize and summer maize under the range of 0.8-1.0 PNB-P, can be obtained, wherein:

[0100] Spring maize: 37.6-49.3 kg P / ha;

[0101] Summer maize: 37.0-50.5 kg P / ha;

[0102] (6) According to the range of the amount of phosphorus applied obtained in step (5), according to the formula in step (3), the allowed surplus amount of phosphorus under the optimized phosphorus utilization rate, i.e. the range of 0.80-1.00 PNB-P for spring maize and summer maize, can be obtained, wherein:

[0103] Spring maize: 0-9.9 kg P / ha;

[0104] Summer maize: 0-10.1 kg P / ha;

[0105] Further, the range of phosphorus application amount is converted into the actual amount in production practice, i.e. the elemental phosphorus is converted into oxide and multiplied by the coefficient 2.292, allowing the surplus amount of phosphorus fertilizer, wherein:

[0106] For spring maize: 0-22.7 kg P2O5 / ha;

[0107] For summer maize: 0-23.1 kg P2O5 / ha;

[0108] In the main production areas of spring maize and summer maize, the habit of fertilization is set as a control, and two scenarios of habit fertilization and optimized fertilization are set to verify the rationality of the range of phosphorus surplus. Including the yield, phosphorus application amount, phosphorus uptake and PNB-P under different fertilization scenarios of maize.

[0109] Table 1

[0110]

[0111]

[0112] Table 1 is the influence of different fertilization scenarios on phosphorus application amount, yield, phosphorus uptake and PNB-P. The results of field test can be seen that the habit of fertilization has a serious problem of overuse of phosphorus, wherein the PNB-P of spring maize and summer maize is less than 0.8, and the surplus amount of phosphorus fertilizer exceeds the upper limit of the allowed surplus amount, and the excess value reaches 10.3 and 30.9 kg P2O5 / ha respectively; while the optimized fertilization shows that compared with the habit of fertilization, the phosphorus application amount is reduced by 21.7% and 37.5% for spring maize and summer maize respectively, while the yield is increased by 8.4% and 11.4% respectively, and the PNB-P reaches 0.98 and 0.97 respectively.

[0113] Current phosphorus fertilizer is still necessary to ensure the yield of maize. Due to the low water solubility and difficult volatility of phosphorus, it is often adsorbed and deposited in the form of mineral salt in the soil, resulting in the farmers' input of phosphorus fertilizer far exceeding the crop demand. Crops need sufficient phosphorus in the early stage of growth, which plays a decisive role in crop yield, but the negative effect of excessive phosphorus fertilizer 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. Under the premise of ensuring crop yield, it is extremely important to manage phosphorus fertilizer according to the yield response of crops, i.e. the yield increase efficiency after applying phosphorus fertilizer. Some methods are used to activate soil phosphorus, such as adding phosphorus solubilizing bacteria, phosphorus activators, etc. to accelerate the transformation of residual phosphorus and increase the availability of phosphorus. These methods have played a role in activating soil phosphorus to some extent, but only have a relieving effect. Reducing the amount of phosphorus fertilizer from the source is the best treatment method. Our research balances soil nutrients and crop absorption to provide a better range of phosphorus application for farmers and agricultural decision-makers under the premise of ensuring yield increment, which helps to utilize phosphorus resources. In addition, according to the planting types of maize, such as spring maize and summer maize, to develop a reasonable range of phosphorus application is of great significance to improve the utilization rate of phosphorus, protect the ecological environment and save resources. However, there is no exact range of phosphorus input to improve the productivity of small farmers. Our invention solves this problem and can maximize the resource-saving utilization of phosphorus ore, which provides a feasible measure for the intensive management of global phosphorus fertilizer.

[0114] The above-described embodiments are only to describe the preferred modes of the present application, and not to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for determining a regional corn allowable phosphorus fertilizer application surplus amount, characterized by, Comprising the following steps: S1. Obtain regional maize phosphorus fertilizer yield increment data, i.e. yield increment of phosphorus fertilizer, according to field experiment data; Field experiment data requirements: the same plot contains yield of phosphorus fertilizer treatment and no phosphorus fertilizer treatment; there is a clear amount of phosphorus fertilizer and maize yield; except for the amount of phosphorus fertilizer, other measures including planting mode, farmland management measures are consistent; According to the yield of phosphorus fertilizer treatment and the yield of no phosphorus fertilizer treatment, the quantitative relationship between the yield of phosphorus fertilizer and the yield of no phosphorus fertilizer is established by formula (1): the phosphorus fertilizer treatment is the full use of nitrogen, phosphorus and potassium fertilizer, and the only difference between the no phosphorus fertilizer treatment and the phosphorus fertilizer treatment is that no phosphorus fertilizer is used; Y0=a×Y (1); In formula (1), Y represents the yield obtained under the application of phosphorus fertilizer, and Y represents the yield obtained under the application of phosphorus fertilizer; Y0 represents the yield of no phosphorus treatment; a is a coefficient, which represents the proportion of no phosphorus yield to phosphorus treatment; The yield increment efficiency of maize after applying phosphorus fertilizer is calculated by formula (1): Y OΔ = (1 - a) x 100 (2); In formula (2), Y OΔ represents the yield increase rate (%) under the optimized application of phosphorus fertilizer; S2. Construct the relationship between the amount of phosphorus and the yield increment of phosphorus fertilizer; Calculate the yield increment rate under different amounts of phosphorus: Y Δ = (Y-Y0)÷Y0x100 (3); In formula (3), Y Δ represents the yield increase rate (%) under different phosphorus application amounts, Y represents the yield with phosphorus application, and Y0 represents the yield without phosphorus application; Further obtain the relationship between the amount of phosphorus and the yield increment of phosphorus fertilizer: Y Δ = b x F P 2 + c x F P + d (4); In formula (4), F P represents the amount of phosphorus applied; b, c, d are coefficients; Calculate the yield increment of phosphorus and the corresponding amount of phosphorus under the increment by formula (4); Further calculate the amount of phosphorus under the yield increment rate obtained by formula (1) and formula (2); S3. Establish the linear relationship between the amount of phosphorus and the apparent balance of phosphorus; the apparent balance of phosphorus is the difference between the amount of phosphorus and the amount of phosphorus removed by crops; Phosphorus apparent equilibrium (P Δ ) was calculated as: P Δ = F P -R p (5); In formula (5), P Δ represents phosphorus apparent balance; F P represents phosphorus application amount; R p represents crop phosphorus removal amount, which is the phosphorus removal amount of corn aboveground, and is the sum of phosphorus absorbed by grain and straw; Establishment of P Δ and F P linear relationship between parameters; P Δ = e×F P + f(6); In formula (6), P Δ represents the apparent equilibrium of phosphorus; F P represents the amount of phosphorus applied; e is a coefficient; and f is a constant. S4. Determine the data range of phosphorus partial nutrient balance based on the yield increment of regional maize phosphorus fertilizer: According to the regression relationship in S2, the amount of phosphorus under the best yield increment of S1 is obtained, and then according to the relationship of S3, the best apparent balance of phosphorus is obtained; according to the difference between the amount of phosphorus and the amount of phosphorus removed by crops, the amount of phosphorus removed by crops is obtained; The best PNB-P is calculated according to the following formula: PNB-P = R p ÷F P ; where PNB-P represents phosphorus nutrient balance, R p represents crop phosphorus removal, F P represents phosphorus application rate; If the best PNB-P>1.0, adjust the upper limit of PNB-P to 1.0, and the lower limit to 0.8; If 0.8<best PNB-P<1.0, adjust the lower limit of PNB-P to 0.8, and the upper limit remains unchanged; If the best PNB-P<0.8, adjust the upper limit of PNB-P to 0.8, and the lower limit remains unchanged; Wherein, the upper limit corresponds to the minimum amount of phosphorus, and the lower limit corresponds to the maximum amount of phosphorus; S5. According to the amount of phosphorus obtained by formula in step S4, the range of the amount of phosphorus is obtained according to step S4; S6. According to the relationship between the amount of phosphorus and the apparent balance of phosphorus in step S3, the range value of the apparent balance of phosphorus is determined, which is the allowed phosphorus application surplus of regional maize; S7. Convert the allowed phosphorus application surplus of regional maize obtained in step S6 into the amount of phosphorus fertilizer in production practice to obtain the allowed phosphorus fertilizer application surplus of regional maize.

2. A system for determining a regional corn allowable phosphorus fertilizer application surplus, comprising: It comprises: Memory and processor, the memory has computer program run by the processor, the computer program runs when the processor executes the determination method of the allowed phosphorus fertilizer application surplus of regional maize as claimed in claim 1.

3. A storage medium, characterized by The storage medium has stored thereon a computer program which, when executed, performs the method of determining a regional corn allowable phosphorus application surplus as claimed in claim 1.

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