Method for determining the allowable phosphorus fertilizer application surplus of a region of potatoes

Abstract

The application discloses a method for determining the surplus amount of phosphorus fertilizer application for regional potato, and relates to the technical field of agriculture.The method comprises the following steps: obtaining the yield increment of phosphorus fertilizer for regional potato 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 potato, 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, and the range value is the surplus amount of phosphorus application for regional potato; and obtaining the surplus amount of phosphorus fertilizer application for regional potato after data conversion.The method can guarantee the yield of potato and maximize the saving use of phosphate rock 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 a region of potatoes. BACKGROUND

[0002] Potatoes will contribute 50% of the yield increment in future food growth, due to its super high yield potential and nutritional value, potatoes will play an important role in solving world hunger and improving people's dietary nutrition. Planting potatoes has become an important resource for developing countries to ensure farmers' income, tap the potential of food production and ensure food security. High-yield varieties, adequate nutrient supply and plant protection measures are essential to improve potato yield. Fertilization, as one of the essential measures in potato production, plays an irreplaceable role in improving potato yield.

[0003] Phosphorus fertilizer input is particularly important for potato yield, and adequate phosphorus supply is needed to realize the yield potential of potatoes. Insufficient phosphorus supply will reduce potato yield, but when the supply exceeds a certain threshold, potato yield will not increase significantly. Phosphorus fertilizer can promote the normal growth and development of potato seedlings, enhance the drought resistance, cold resistance and adaptability of plants, and thus increase tuber yield. However, farmers often fertilize blindly in pursuit of high yield, leading to excessive fertilization. Many growers provide all or most of the phosphorus fertilizer before planting, and the special sandy soil type preferred by potatoes often leads to nutrient leaching or runoff loss, threatening the safety of the ecological environment. Long-term overuse of phosphorus fertilizer reduces the yield-increasing effect of fertilization on potatoes, and also causes low phosphorus fertilizer utilization rate, waste of fertilizer resources, and environmental risks caused by fertilizer loss.

[0004] The current season recovery rate of potato phosphorus fertilizer is usually less than 20%, and as a mineral resource, phosphorus fertilizer is non-renewable, which leads to a continuous decrease in reserves. With the continuous exploitation of phosphorus ore, the reserves of phosphorus ore are expected to be exhausted within 100 years. The randomness of phosphorus fertilizer input has led to slower than expected growth of potatoes, and has hindered further phosphorus fertilizer utilization. If the apparent balance between soil-plant systems is to be maintained and phosphorus fertilizer utilization is to be improved, the amount of phosphorus fertilizer should be reduced to the level of phosphorus balance or below to significantly reduce soil phosphorus accumulation and phosphorus loss in high-phosphorus soil, but the premise is to ensure that potatoes do not reduce yield.

[0005] By improving the phosphorus utilization efficiency, and then reducing the phosphorus fertilizer input, it will have a very high driving benefit to the world phosphorus cycle. Controlling the phosphorus fertilizer application amount to the apparent phosphorus balance level of the soil-plant system, determining the allowable surplus range of the phosphorus fertilizer, is an important way to solve the excessive application of phosphorus fertilizer and the fixed loss, and is also an indispensable and first task in the management of phosphorus fertilizer. Determining the allowable phosphorus surplus range based on the yield increment of crops and the recovery rate of phosphorus fertilizer has important significance for improving crop yield, saving the use of phosphorus fertilizer, reducing environmental point source and non-point source pollution caused by phosphorus fertilizer loss, and promoting the sustainable development of agriculture. SUMMARY

[0006] The purpose of the present application is to provide a method for determining the allowable phosphorus fertilizer application surplus amount of regional potatoes, to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0008] The present application provides a method for determining the allowable phosphorus fertilizer application surplus amount of regional potatoes, comprising the following steps:

[0009] S1. According to the field experiment data, the yield increment data of regional potato phosphorus fertilizer, i.e. the yield increment of phosphorus fertilizer, is obtained;

[0010] The field experiment data requirements: the same plot contains yield of phosphorus fertilizer treatment and yield of no phosphorus fertilizer treatment; there are clear phosphorus fertilizer amount and potato yield; except for the different amount of phosphorus fertilizer, other measures including planting mode, farmland management and other measures are consistent;

[0011] 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 treatment and the yield of no phosphorus fertilizer treatment is established by formula (1): (the phosphorus fertilizer treatment is the full application of nitrogen, phosphorus and potassium fertilizer, and the no phosphorus fertilizer treatment is different from the phosphorus fertilizer treatment only in that no phosphorus fertilizer is applied);

[0012] Y0=a×Y (1);

[0013] 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 the yield of no phosphorus to the yield of phosphorus treatment;

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

[0015] Y OΔ =(1-a)×100 (2);

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

[0017] S2. Establish the relationship between phosphorus application rate and increased phosphate fertilizer yield;

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

[0019] Y Δ = (Y-Y0)÷Y0×100(3);

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

[0021] Further research can reveal the relationship between phosphorus application rate and increased phosphate fertilizer yield:

[0022] Y Δ =b×F P 2 + c×F P +d (4);

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

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

[0025] Furthermore, the amount of phosphorus applied under the yield increase obtained from equations (1) and (2) can be calculated;

[0026] S3. Establish 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 from the crop.

[0027] Phosphorus apparent balance (P) Δ The calculation is as follows:

[0028] P Δ =F P -R p (5);

[0029] In equation (5), P Δ Indicates phosphorus apparent balance; F P Indicates the amount of phosphorus applied; R p This represents the amount of phosphorus removed from crops, specifically the amount of phosphorus removed from the aboveground parts of potatoes, which is the sum of phosphorus absorbed by the grains and straw.

[0030] Establish P Δ and F P Linear relationship between parameters;

[0031] P Δ =e×F P +f(6);

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

[0033] S4. Determine the data range of phosphorus partial nutrient balance based on the phosphorus fertilizer yield increment of regional potato:

[0034] According to the regression relationship in S2, the phosphorus application amount under the optimal yield increment of S1 is obtained, and then according to the relationship in S3, the optimal apparent phosphorus balance amount is obtained based on the phosphorus application amount. According to the difference between the phosphorus application amount and the crop phosphorus removal amount, the crop phosphorus removal amount is obtained;

[0035] The optimal PNB-P is calculated according to the following formula:

[0036] PNB-P = R p ÷ F P ;

[0037] In the formula, PNB-P represents phosphorus partial nutrient balance, R p represents crop phosphorus removal amount, and F P represents phosphorus application amount;

[0038] 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;

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

[0040] If the optimal PNB-P < 0.8, the upper limit of PNB-P is adjusted to 0.8, and the lower limit is unchanged;

[0041] The upper limit corresponds to the minimum phosphorus application amount, and the lower limit corresponds to the maximum phosphorus application amount;

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

[0043] 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, which is the allowed phosphorus application surplus of regional potato;

[0044] S7. The allowed phosphorus application surplus of regional potato obtained in step S6 is converted into the phosphorus fertilizer application amount in production practice, and the allowed phosphorus fertilizer application surplus of regional potato is obtained.

[0045] The application further provides a system for determining the surplus amount of phosphorus fertilizer application allowed for a region of potatoes, comprising a memory and a processor, the memory having stored thereon a computer program to be run by the processor, the computer program performing the method for determining the surplus amount of phosphorus fertilizer application allowed for a region of potatoes when run by the processor.

[0046] The application further provides a storage medium having stored thereon a computer program, the computer program performing the method for determining the surplus amount of phosphorus fertilizer application allowed for a region of potatoes when run.

[0047] The application discloses the following technical effects:

[0048] The application provides a method for determining the surplus amount of phosphorus fertilizer application allowed for a region of potatoes, to solve the problem of unscientific phosphorus fertilizer application in the prior art, and to achieve the maximum saving of phosphorus resources while ensuring the yield of potatoes, thereby providing a feasible measure for intensive management of phosphorus fertilizer. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0050] Figure 1 The figure for determining the yield increase effect of potatoes after phosphorus application in embodiment 1 of the present application;

[0051] Figure 2 The figure for determining the relationship between the amount of phosphorus application for potatoes and the yield increase in embodiment 1 of the present application;

[0052] Figure 3 The figure for determining the relationship between the amount of phosphorus application for potatoes and the apparent balance of phosphorus in embodiment 1 of the present application. DETAILED DESCRIPTION

[0053] The 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 certain aspects, characteristics and embodiments of the present application.

[0054] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Additionally, for a range of values of, for example, a parameter, an individual value from the range can be expressly disclosed herein to mean that each and every intermediate value of the range is also expressly disclosed. All individual values and subranges from the recited range are specifically included in the present application. The upper and lower limits of these smaller ranges can independently be included or excluded in the range.

[0055] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, the preferred methods and materials are described. All documents mentioned herein 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, the content of the present specification will control.

[0056] Various modifications and changes can be made to the specific embodiments of the present application described herein without departing from the scope or spirit of the application. Other embodiments of the application will be apparent to those of ordinary skill in the art from the description and examples presented herein. The description and examples are illustrative of the application and are not intended to limit the scope of the application.

[0057] As used herein, the terms "comprise", "comprising", "include", "including", "have", "having" and the like are open-ended and do not exclude additional, unrecited elements or method steps.

[0058] Potato planting areas are extensive, and are planted in various regions. Embodiments of the present application divide potatoes into two parts according to potato planting areas and crop rotation, and divide them into two planting areas, namely, southern China and northern China, and carry out relevant embodiments. Among them, the southern China region is a one-year two-crop planting system, continuous cropping or crop rotation with other crops; the northern China region is a one-year one-crop system.

[0059] Embodiment 1

[0060] (1) Collect and summarize the field test data of potatoes in the southern and northern regions of the research area, wherein:

[0061] All test data come from field tests, and the field test types include different phosphorus fertilizer dosage tests, 3414 tests, and phosphorus fertilizer recommended dosage tests, etc. The test data include the amount of phosphorus fertilizer, potato yield, and phosphorus uptake amount of phosphorus fertilizer and no phosphorus fertilizer treatment;

[0062] Calculate the yield-increasing effect of phosphorus fertilizer application for potatoes in each southern and northern region, wherein: the optimized fertilization yield uses the treatment with the highest yield of nitrogen, phosphorus and potassium full application among all treatments.

[0063] A linear relationship was used to model the relationship between total NPK application and no-P application yield in the south and north (e.g. Figure 1 ), where:

[0064] South: y = 0.831x;

[0065] North: y = 0.840x;

[0066] In this equation, x is the potato yield with total NPK application, and y is the potato yield without P application;

[0067] Further, the optimal P fertilizer yield-increasing effect was calculated, where:

[0068] South = (1 - 0.831) x 100 = 16.9%;

[0069] North = (1 - 0.840) x 100 = 16.0%;

[0070] (2) A quadratic curve model was used to model the relationship between P application and yield increase in the south and north (e.g. Figure 2 ), where:

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

[0072] South: y = -0.0052x 2 + 0.6818x + 1.8546;

[0073] North: y = -0.0032x 2 + 0.5034x + 1.2691;

[0074] In this equation, y is the yield increase after P application, and x represents the P application amount;

[0075] Further, the P application amount under the optimal yield increase obtained in step (1) can be obtained, where:

[0076] South: 28.1 kg P / ha;

[0077] North: 38.9 kg P / ha;

[0078] (3) A linear relationship was used to model the relationship between P application and apparent P balance, where:

[0079] The apparent P balance is the difference between P application and P removal, where:

[0080] The nutrient removal amount is the phosphorus accumulation amount of the above-ground part, the phosphorus content of the straw is low, the mineralization amount in the season is small, and the availability is low, so the straw nutrient is classified as the nutrient removal amount.

[0081] The relationship between the phosphorus application amount and the apparent phosphorus balance amount is as follows Figure 3 wherein:

[0082] South: y = 0.9561x - 16.099;

[0083] North: y = 0.8527x - 19.955;

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

[0085] Further, the apparent phosphorus balance amount under the optimal yield increment in step (1) can be obtained, wherein:

[0086] South: 10.8 kg P / ha;

[0087] North: 13.2 kg P / ha;

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

[0089] The apparent phosphorus balance of potato in the south and the north is negative, so the phosphorus removal amount is:

[0090] South: 28.1 - 10.8 = 17.3 kg P / ha;

[0091] North: 38.9 - 13.2 = 25.7 kg P / ha;

[0092] Further, the PNB-P of potato in the south and the north under the yield increment in step (1) can be obtained, wherein:

[0093] South: 17.3 ÷ 28.1 = 0.62;

[0094] North: 25.7 ÷ 38.9 = 0.66;

[0095] (5) The phosphorus application amount is adjusted according to the PNB value. Because the PNB-P of potato in the south and the north is less than 0.8, the preliminary goal is to first increase the utilization rate to 0.8, so the upper limit of the PNB-P of potato in the south and the north is adjusted to 0.8, and the corresponding lower limit of the phosphorus application amount is the phosphorus removal amount, that is, the phosphorus removal amount is 80% of the phosphorus application amount, and the phosphorus surplus amount (apparent phosphorus balance amount) at this time is equivalent to 0.2 times the phosphorus application amount (i.e. 1 - 0.8 = 0.2).

[0096] Therefore, the lower limit of phosphorus application in the southern and northern potato areas is:

[0097] Southern: 16.099 ÷ (0.9561-0.2) = 21.3 kg P / ha;

[0098] Northern: 19.955 ÷ (0.8527-0.2) = 30.6 kg P / ha;

[0099] Further, it can be concluded that the range of phosphorus application in the optimization of phosphorus utilization rate in different regions, i.e. PNB-P in the southern region is between 0.62-0.80, and PNB-P in the northern region is between 0.66-0.80, wherein:

[0100] Southern: 21.3-28.1 kg P / ha;

[0101] Northern: 30.6-38.9 kg P / ha;

[0102] (6) According to the range of phosphorus application obtained in step (5), according to the formula in step (3), the range of optimal phosphorus utilization rate can be obtained, i.e. PNB-P in the southern region is between 0.62-0.80, and PNB-P in the northern region is between 0.66-0.80, wherein:

[0103] Southern: 4.3-10.8 kg P / ha;

[0104] Northern: 6.1-13.2 kg P / ha;

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

[0106] Southern: 9.8-24.7 kg P2O5 / ha;

[0107] Northern: 14.1-30.3 kg P2O5 / ha;

[0108] In the main potato producing areas in the southern and northern regions, in comparison with the conventional fertilization, two scenarios of conventional fertilization and optimal fertilization are set to verify the rationality of the range of phosphorus surplus, including yield, phosphorus application, phosphorus uptake and PNB-P under different fertilization scenarios of potato.

[0109] Table 1

[0110]

[0111] Table 1 is the effect of different fertilization scenarios of potato in the southern and northern regions on the amount of phosphorus applied, yield, phosphorus uptake and PNB-P. Field test results show that the amount of phosphorus applied in the conventional fertilization is very serious overuse, resulting in PNB-P of potato in the southern and northern regions being only 0.34 and 0.51 respectively, far lower than the lower limit, and the phosphorus fertilizer surplus amount exceeds the upper limit of the allowed surplus amount, with the excess values reaching 147.0 and 102.9 kg P2O5 / ha respectively; and the amount of phosphorus applied in the optimized fertilization shows that, compared with the conventional fertilization, the phosphorus fertilizer use amount of potato in the southern and northern regions is reduced by 50.5% and 26.7% respectively, while the yield is increased by 6.6% and 9.2% respectively, and the PNB-P is within the reasonable range obtained, reaching 0.71 and 0.73 respectively.

[0112] Phosphorus fertilizer, as one of the three major nutrients, plays an important role in ensuring potato yield. However, in recent years, excessive phosphorus application is a serious problem in potato agricultural production. In potato production, only less than one fifth of phosphorus is absorbed by potato, and sandy soil for planting potato is prone to phosphorus loss, which has become an important factor leading to eutrophication of water bodies in the environment, thereby damaging the ecological system. While ensuring potato yield and the yield-increasing effect of phosphorus fertilizer on potato, it is crucial to develop a range of allowed phosphorus surplus for potato, which corresponds to improving the sustainability of potato agricultural production, and can avoid nutrient loss of phosphorus while maximizing the yield potential of crops. In the present application, the allowed phosphorus surplus range is considered for potato in the southern and northern planting modes, which not only considers the ecological effect, but also considers the actual production situation, and to some extent, can also play a role in saving phosphorus fertilizer resources and improving phosphorus fertilizer utilization rate.

[0113] The above-described embodiments are only to describe the preferred modes of the present application, and do not 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 potato allowable phosphorus fertilizer application surplus amount, characterized by, Comprising the following steps: S1. Obtain regional potato 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 phosphorus fertilizer treatment and no phosphorus fertilizer treatment yield; There is a clear amount of phosphorus fertilizer and potato yield; Except for the amount of phosphorus fertilizer, other measures including planting pattern, farmland management measures are consistent; According to the yield of phosphorus fertilizer treatment and the yield of non-phosphorus fertilizer treatment, the quantitative relationship between the yield of phosphorus fertilizer and the yield of non-phosphorus fertilizer is established by formula (1): the phosphorus fertilizer treatment is the full use of nitrogen, phosphorus and potassium fertilizer, and the non-phosphorus fertilizer treatment is only different from the phosphorus fertilizer treatment in 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 Y0 represents the yield obtained under the application of phosphorus fertilizer; a is a coefficient, which represents the proportion of the yield obtained under the application of phosphorus fertilizer to the yield obtained under the application of phosphorus fertilizer; The yield increment of potato 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 fertilizer and the yield increment of phosphorus fertilizer; Calculate the yield increment under different amounts of phosphorus fertilizer: 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 fertilizer 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; The yield increment of phosphorus fertilizer and the corresponding amount of phosphorus fertilizer under this increment are calculated by formula (4); Further calculate the amount of phosphorus fertilizer under the yield increment obtained by formula (1) and formula (2); S3. Establish the linear relationship between the amount of phosphorus fertilizer and the apparent balance of phosphorus; the apparent balance of phosphorus is the difference between the amount of phosphorus fertilizer 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 apparent balance of phosphorus; F P represents amount of phosphorus applied; R p represents amount of phosphorus removed by crops, which is the amount of phosphorus removed by above-ground parts of potato and the total amount of phosphorus absorbed by grains and straws; 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 potato phosphorus fertilizer: According to the regression relationship in S2, the amount of phosphorus fertilizer under the best yield increment of S1 is obtained, and then according to the relationship in S3, the best apparent balance of phosphorus is obtained; according to the difference between the amount of phosphorus fertilizer 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<the 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 fertilizer, and the lower limit corresponds to the maximum amount of phosphorus fertilizer; S5. According to the amount of phosphorus fertilizer obtained by formula in step S4, the range of the amount of phosphorus fertilizer is obtained according to step S4; S6. According to the relationship between the amount of phosphorus fertilizer 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 potato; S7. Convert the allowed phosphorus application surplus of regional potato obtained in step S6 into the amount of phosphorus fertilizer in production practice to obtain the allowed phosphorus fertilizer application surplus of regional potato.

2. A system for determining a regional potato allowable phosphorus fertilizer application surplus, the system comprising: Comprising: Memory and processor, the memory has computer programs run by the processor stored thereon, the computer programs run by the processor execute the method for determining the allowed phosphorus fertilizer application surplus of regional potato 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 potato allowable phosphorus application surplus as claimed in claim 1.

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