Compound fertilizer and application thereof in high-oil soybean planting

Abstract

The invention belongs to the technical field of compound fertilizers, and particularly relates to a compound fertilizer and application thereof in high-oil soybean planting, and the method comprises the following steps: S1, selecting an area field for planting high-oil soybeans; s2, soil is detected through two methods, and the available phosphorus content of the soil is calculated according to a formula; s3, adjusting the proportion of nitrogen, phosphorus and potassium in the compound fertilizer, and preparing the compound fertilizer to apply a base fertilizer; s4, turning the planting soil to which the base fertilizer is applied; s5, high-oil soybean varieties are screened and sowed; s6, topdressing is applied from high-oil soybean branching to the initial stage of flowering; and S7, applying a foliar fertilizer to the soybeans after pod bearing in the growth process of the soybeans. According to the method, the available phosphorus content information of the soil is calculated by detecting the soil in the high-oil soybean planting land, and the proportion of nitrogen, phosphorus and potassium in the compound fertilizer is adjusted according to different available phosphorus contents in the soil, so that the growth of the high-oil soybeans is promoted, the yield of the high-oil soybeans is increased, and meanwhile, the fat content of the soybeans can be increased.

Description

Technical Field

[0001] The invention belongs to the technical field of compound fertilizers, and in particular relates to a compound fertilizer and application thereof in the planting of high-oil soybeans. Background Art

[0002] At present, during the planting process of high-oil soybeans, phosphorus fertilizer has a great influence on soybean fat accumulation, and compound fertilizers are usually used as base fertilizer, topdressing and foliar fertilizers during the planting stage. However, in each process of applying base fertilizer, topdressing and foliar fertilizer, the effective phosphorus content in the soil is different, and the effective phosphorus content in ordinary fertilizers is fixed and limited. When the effective phosphorus content in the soil is high during the fertilization stage, the effective phosphorus in ordinary fertilizers will not be absorbed by high-oil soybeans, and even too high effective phosphorus in the soil will affect the growth of high-oil soybeans, thereby affecting soybean fat accumulation; if the effective phosphorus content in the soil is low during the fertilization stage, the effective phosphorus in ordinary fertilizers may not be able to meet the growth needs of high-oil soybeans, resulting in a decrease in the yield of high-oil soybeans and a decrease in the fat content of high-oil soybeans. Summary of the invention

[0003] The purpose of the present invention is to provide a compound fertilizer and its application in the cultivation of high-oil soybeans, aiming to solve the problem proposed in the prior art that phosphorus-containing compound fertilizers are often used as base fertilizers, topdressing fertilizers and foliar fertilizers in the cultivation stage during the high-oil soybean cultivation process, but due to the unbalanced effective phosphorus content in the soil, ordinary fertilizers cannot be well absorbed and utilized by the soil and high-oil soybeans, thereby affecting the yield and fat content of the high-oil soybeans produced in the local soil.

[0004] To achieve the above object, the present invention provides the following technical solution: an application of a compound fertilizer in the cultivation of high-oil soybeans, comprising the following steps:

[0005] S1. Selecting a regional field where high-oil soybeans are planted, that is, obtaining planting land;

[0006] S2. The phosphorus content of the soil in the planting land is tested by the NaHCO3 method and the Bray method respectively, and the effective phosphorus content in the planting land is calculated according to the soil effective phosphorus calculation formula, and the data obtained by the two methods are compared and confirmed to obtain the soil effective phosphorus content data;

[0007] S3, adjusting the ratio of nitrogen, phosphorus and potassium in the compound fertilizer according to the soil effective phosphorus content data obtained in S2, and applying the prepared compound fertilizer to the planting land as a base fertilizer;

[0008] S4, turning over the planting soil after applying the base fertilizer, using a harrow to rake the compound fertilizer into the soil within 15cm-25cm, and watering the turned soil to allow the compound fertilizer to penetrate;

[0009] S5. When the soil is semi-dry, sow the selected high-quality high-oil soybean seeds in the planting land;

[0010] S6. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. A topdressing should be carried out from the branching to the early flowering of high-oil soybeans, which has a good yield-increasing effect. At this time, the compound fertilizer is diluted with clean water to form a medium-concentration compound fertilizer water and irrigated into the soil;

[0011] S7. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. Foliar fertilizer is applied to soybeans after they have formed pods during their growth process. At this time, the compound fertilizer is diluted with clean water to become a low-concentration compound fertilizer water and sprayed on the leaves of soybeans.

[0012] As a preferred compound fertilizer of the present invention and its application in high-oil soybean cultivation, the calculation formula for soil available phosphorus in S2 is: The calculation formula for soil available phosphorus is: effective phosphorus content (unit: mg / kg) = phosphorus content (unit: mg / kg) × soil available phosphorus saturation coefficient.

[0013] As a preferred compound fertilizer of the present invention and its application in high-oil soybean planting, if the effective phosphorus content of the soil in S2 is less than 10-20 mg / kg, it is low phosphorus; if the effective phosphorus content of the soil is 20-50 mg / kg, it is medium phosphorus; if the effective phosphorus content of the soil is higher than 50 mg / kg, it is high phosphorus.

[0014] As a preferred compound fertilizer of the present invention and its application in high-oil soybean cultivation, if the calculated result of the effective phosphorus content in the soil in S3 is low phosphorus, the phosphorus in the compound fertilizer is 1.5 times that of nitrogen and potassium; if the calculated result of the effective phosphorus content in the soil is medium phosphorus, the phosphorus in the compound fertilizer is 1 times that of nitrogen and potassium; if the calculated result of the effective phosphorus content in the soil is high phosphorus, the phosphorus in the compound fertilizer is 0.5 times that of nitrogen and potassium.

[0015] As a preferred embodiment of the compound fertilizer of the present invention and its application in high-oil soybean planting, the fertilization method in S3 adopts a land preparation fertilization method.

[0016] As a preferred composite fertilizer of the present invention and its application in high-oil soybean planting, the soil turning depth in S4 is between 15-25 cm.

[0017] As a preferred embodiment of the compound fertilizer of the present invention and its application in high-oil soybean planting, the harrowing machine in S4 adopts a vertical and horizontal cross harrowing method.

[0018] As a preferred composite fertilizer of the present invention and its application in high-oil soybean planting, the frequency of foliar fertilizer application in S7 is: once every 7-10 days, and sprayed continuously 2-3 times.

[0019] A compound fertilizer comprising the following ingredients:

[0020] Nitrogen 14g / kg, phosphorus 7-21g / kg, potassium 14g / kg, diammonium phosphate 12g / kg, potassium sulfate 12g / kg, trace elements 11g / kg, nitrate phosphorus 5.7g / kg, potassium oxide 4.5g / kg, organic matter 4g / kg, spirotetramat suspension 0.8g / kg.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The soil in the high-oil soybean planting land is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil. The ratio of nitrogen, phosphorus and potassium in the compound fertilizer is adjusted according to the different effective phosphorus contents in the soil, thereby promoting the growth of high-oil soybeans, increasing the yield of high-oil soybeans, and at the same time increasing the fat content of soybeans. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a logical schematic diagram of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 The present invention provides the following technical solution: a compound fertilizer and its application in high-oil soybean planting, comprising the following steps:

[0027] S1. Selecting a regional field where high-oil soybeans are planted, that is, obtaining planting land;

[0028] S2. The soil in the planting land is tested by the NaHCO3 method and the Bray method respectively, and the effective phosphorus content in the planting land is calculated according to the soil effective phosphorus calculation formula, and the data obtained by the two methods are compared and confirmed to obtain the soil effective phosphorus content data;

[0029] The calculation formula of soil available phosphorus is: available phosphorus content (unit: mg / kg) = phosphorus content (unit: mg / kg) × soil available phosphorus saturation coefficient;

[0030] S3, adjusting the ratio of nitrogen, phosphorus and potassium in the compound fertilizer according to the soil effective phosphorus content data obtained in S2, and applying the prepared compound fertilizer to the planting land as a base fertilizer;

[0031] S4. Turn over the soil after applying the base fertilizer, rake the compound fertilizer into the soil within 15cm-25cm by harrowing the soil, and water the turned soil to make the compound fertilizer penetrate.

[0032] S5. When the soil is semi-dry, sow the selected high-quality high-oil soybean seeds in the planting land;

[0033] S6. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. A topdressing should be carried out from the branching to the early flowering of high-oil soybeans, which has a good yield-increasing effect. At this time, the compound fertilizer is diluted with clean water to form a medium-concentration compound fertilizer water and irrigated into the soil;

[0034] S7. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. Foliar fertilizer is applied to soybeans after they have formed pods during their growth process. At this time, the compound fertilizer is diluted with clean water to become a low-concentration compound fertilizer water and sprayed on the leaves of soybeans.

[0035] Table 1 Effect of available phosphorus content in compound fertilizer and available phosphorus content in soil on high oil soybean yield

[0036]

[0037] According to Table 1, when the effective phosphorus content in the compound fertilizer increases from 7 mg / kg to 21 mg / kg, the yield of high-oil soybean generally increases, and three groups of soils with different effective phosphorus contents are extracted for testing, which shows that increasing the effective phosphorus content in the compound fertilizer helps to increase the yield of high-oil soybean. This is because phosphorus is one of the important nutrients for soybean growth and an important element for fat metabolism. It participates in a variety of metabolic processes in plants and has an important influence on the growth, development and yield formation of soybeans.

[0038] However, when the available phosphorus content in the soil is high (such as 30 mg / kg), the effect of continuing to increase the available phosphorus content in compound fertilizers on the yield of high-oil soybeans may be weakened. This may be because there is already enough phosphorus in the soil, and the absorption and utilization efficiency of phosphorus by soybeans has reached saturation. Therefore, the available phosphorus content in compound fertilizers and the available phosphorus content in the soil have an interactive effect on the yield of high-oil soybeans. Under the same soil available phosphorus content, increasing the available phosphorus content in compound fertilizers can increase the yield of high-oil soybeans.

[0039] Under the same effective phosphorus content of compound fertilizer, increasing the effective phosphorus content in the soil can also increase the yield of high-oil soybeans. This shows that in actual production, we need to comprehensively consider both fertilizer and soil factors and formulate scientific fertilization strategies to increase the yield of high-oil soybeans.

[0040] Table 2 Fat content of high-oil soybean and common soybean under different concentrations of compound fertilizer:

[0041]

[0042] As can be seen from Table 2, the change in fat content (%) is a hypothetical increase or decrease range, which is used to illustrate the potential impact of different concentrations of compound fertilizer on the fat content of oil soybeans and ordinary soybeans. The change in fat content of high-oil soybeans and ordinary soybeans can be clearly seen according to different waste concentrations. The fertilizer concentration is expressed in hm2 per hectare. 2 ) administered, and the fat content growth rate was expressed as a percentage (%), representing the increase ratio of fat content relative to the control group.

[0043] Table 3 Effect of available phosphorus content in different soils and additional foliar fertilizer on fat content in high-oil soybean cultivation:

[0044]

[0045] It is worth noting that, as shown in Table 3, the application of foliar fertilizer can provide additional nutrition for soybeans, especially during the critical period of soybean growth, which helps to promote the accumulation of nutrients such as fat. However, the effect of foliar fertilizer on fat content may be different under different soil available phosphorus content. In low-phosphorus soils, the application of foliar fertilizer may bring about a more significant increase in fat content; in high-phosphorus soils, since the soil itself already contains more phosphorus, the effect of additional foliar fertilizer may be relatively weak.

[0046] It is worth noting that according to the changes in fat content in soil with different available phosphorus contents before and after foliar fertilizer application in Table 3, the fat content has obvious changes after the application of foliar fertilizer.

[0047] Preferably, the calculation formula for soil available phosphorus in S2 is: The calculation formula for soil available phosphorus is: effective phosphorus content (unit: mg / kg) = phosphorus content (unit: mg / kg) × soil available phosphorus saturation coefficient.

[0048] Preferably, if the soil available phosphorus content in S2 is less than 10-20 mg / kg, it is low phosphorus; if the soil available phosphorus content is 20-50 mg / kg, it is medium phosphorus; if the soil available phosphorus content is higher than 50 mg / kg, it is high phosphorus.

[0049] Preferably, in S3, if the calculated soil available phosphorus content is low phosphorus, the phosphorus in the compound fertilizer is 1.5 times the nitrogen and potassium; if the calculated soil available phosphorus content is medium phosphorus, the phosphorus in the compound fertilizer is 1 times the nitrogen and potassium; if the calculated soil available phosphorus content is high phosphorus, the phosphorus in the compound fertilizer is 0.5 times the nitrogen and potassium;

[0050] Preferably, the fertilization method in S3 adopts the land preparation fertilization method, in which the fertilizer is evenly spread on the soil surface, and then deep plowing is performed to fully mix the fertilizer with the soil. This method is suitable for areas with low soil fertility, and can improve soil fertility and increase crop yields.

[0051] Preferably, the soil turning depth in S4 is between 15-25 cm.

[0052] Preferably, the harrow in S4 adopts a vertical and horizontal cross harrowing method.

[0053] Preferably, the frequency of foliar fertilizer application in S7 is: once every 7-10 days, and spray 2-3 times continuously.

[0054] Preferably, a compound fertilizer comprises the following ingredients:

[0055] Nitrogen 14g / kg, phosphorus 7-21g / kg, potassium 14g / kg, diammonium phosphate 12g / kg, potassium sulfate 12g / kg, trace elements 11g / kg, nitrate phosphorus 5.7g / kg, potassium oxide 4.5g / kg, organic matter 4g / kg, spirotetramat suspension 0.8g / kg;

[0056] It should be noted that the phosphorus value in this compound fertilizer is formulated based on the test results of the soil in the planting land using the NaHCO3 method. During the seedling stage, soybeans have a relatively low demand for phosphorus, and as soybeans enter the growth and flowering stages, the demand for phosphorus gradually increases. During the growth stage, phosphorus helps promote the growth and development of soybean plants; during the flowering stage, phosphorus plays a key role in flower bud differentiation and flowering and fruiting.

[0057] Embodiment 2:

[0058] The soil in the planting land is tested by the NaHCO3 method. The NaHCO3 method is another commonly used method for determining soil available phosphorus. Its principle is to use alkaline NaHCO3 solution to convert the phosphorus element in the soil into a soluble form.

[0059] The specific steps are as follows:

[0060] 1. Take an appropriate amount of soil sample and mix it with a certain proportion of NaHCO3 solution. The following steps are included:

[0061] S1. Selecting a regional field where high-oil soybeans are planted, that is, obtaining planting land;

[0062] S2. The soil in the planting land is tested by the NaHCO3 method and the Bray method respectively, and the effective phosphorus content in the planting land is calculated according to the soil effective phosphorus calculation formula, and the data obtained by the two methods are compared and confirmed to obtain the soil effective phosphorus content data;

[0063] It should be noted that when conducting soil testing, the plum blossom point method can be used for sampling, sampling five points in total, namely the center point and the four corners;

[0064] It is also important to note that before sampling, the section should be repaired and cleaned, the top layer of loose soil should be removed, and the edge of the field, roadside, shed side and the place where fertilizer is piled should be avoided;

[0065] In terms of tools, use rust-free sampling tools, avoid using metal utensils for sampling, and promptly fill in the location, time, and sample number of the soil sample after sampling is completed;

[0066] S3, adjusting the ratio of nitrogen, phosphorus and potassium in the compound fertilizer according to the soil effective phosphorus content data obtained in S2, and applying the prepared compound fertilizer to the planting land as a base fertilizer;

[0067] S4, turning over the planting soil after applying the base fertilizer, using a harrow to rake the compound fertilizer into the soil within 15cm-25cm, and watering the turned soil to allow the compound fertilizer to penetrate;

[0068] S5. When the soil is semi-dry, sow the selected high-quality high-oil soybean seeds in the planting land;

[0069] S6. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. A topdressing should be carried out from the branching to the early flowering of high-oil soybeans, which has a good yield-increasing effect. At this time, the compound fertilizer is diluted with clean water to form a medium-concentration compound fertilizer water and irrigated into the soil;

[0070] S7, testing the soil by NaHCO3 method and Bray method respectively to calculate the effective phosphorus content in the soil, and preparing compound fertilizer according to the test results, and applying foliar fertilizer to the soybean after the soybean pods are formed during the growth process. At this time, the compound fertilizer is diluted with clean water to form a low-concentration compound fertilizer water and sprayed on the leaves of the soybean to make the phosphorus in the soil react with NaHCO3;

[0071] 2. After a certain period of reaction, wash the soil sample with water to separate the soluble phosphorus from the water;

[0072] 3. Analyze the phosphorus content in water through the soil available phosphorus calculation formula and calculate the available phosphorus content in the soil.

[0073] The soil in the planting land is tested by the Bray method, which is a commonly used method for determining available phosphorus in soil. Its principle is to use acidic Bray extract to convert phosphorus in the soil into a soluble form. The specific steps are as follows:

[0074] 1. Take an appropriate amount of soil sample and mix it with a certain proportion of acidic Bray extract to make the phosphorus in the soil react with the Bray extract;

[0075] 2. After a certain period of reaction, wash the soil sample with water to separate the soluble phosphorus from the water;

[0076] 3. Analyze the phosphorus content in water through the soil available phosphorus calculation formula and calculate the available phosphorus content in the soil.

[0077] In contrast, the results of the NaHCO3 method are relatively stable, but there is interference with elements such as iron and aluminum in the soil; the results of the Bray method are relatively accurate, but it is not applicable to soils with high pH values. However, calculating the available phosphorus in the planting soil by two different methods can improve the accuracy of the results;

[0078] It should be noted that the soil in the planting land is tested by the NaHCO3 method and the Bray method before applying base fertilizer, topdressing and foliar fertilizer to soybeans, so that the ratio of nitrogen, phosphorus and potassium in the compound fertilizer can be adjusted according to the different effective phosphorus content in the soil.

[0079] Working Principle: When using the compound fertilizer and its application in high-oil soybean planting, first select a field in the area where high-oil soybeans are planted, then test the soil in the planting land by the NaHCO3 method and the Bray method respectively, and calculate the effective phosphorus content in the planting land according to the soil effective phosphorus calculation formula, and compare and confirm the data obtained by the two methods. At this time, if the calculated result of effective phosphorus in the soil is less than 10-20 mg / kg, it is set as low phosphorus. When the soil is low phosphorus, the phosphorus in the compound fertilizer ratio is 1.5 times that of nitrogen and potassium. At this time, the contents of nitrogen, phosphorus and potassium are: Nitrogen 14g / kg, phosphorus 21g / kg, potassium 14g / kg. If the calculated result of effective phosphorus in the soil is between 20-50mg / kg, it is set as medium phosphorus. When the soil is medium phosphorus, the phosphorus in the compound fertilizer ratio is 1 times of nitrogen and potassium. At this time, the contents of nitrogen, phosphorus and potassium are: nitrogen 14g / kg, phosphorus 14g / kg, potassium 14g / kg. If the calculated result of effective phosphorus in the soil is higher than 50mg / kg, it is set as high phosphorus. When the soil is high phosphorus, the phosphorus in the compound fertilizer ratio is 0.5 times of nitrogen and potassium. At this time, the contents of nitrogen, phosphorus and potassium are: nitrogen 14g / kg, phosphorus 7g / kg, potassium 1 4g / kg, then apply the prepared compound fertilizer to the planting land as base fertilizer, and use a harrow to rake the compound fertilizer into the soil within 15cm-25cm, then water the tilled soil to allow the compound fertilizer to penetrate. The advantage of deep application is that soybeans are deep-rooted crops, and their taproots need to have rich nutrients in the root distribution layer in order to better absorb and utilize various nutrients. At the same time, deep application can also reduce nutrient loss. When the soil is semi-dry, sow the selected high-oil variety soybean seeds in the planting land. The selected high-oil soybeans need to remove rotten and inferior ones. After growth and flowering, the soil in the planting land is tested again using the NaHCO3 method and the Bray method, and the phosphorus content in the ingredients is proportional according to the results. Then, it is diluted with clean water and topdressed for the high-oil soybean in the planting area. When applying topdressing, it should be combined with tillage and irrigation to ensure fertilizer efficiency. When spreading, avoid spreading fertilizer on the leaves to prevent burning of the leaves. Finally, after the high-oil soybean is podding, the soil in the planting land is tested using the NaHCO3 method and the Bray method, and the phosphorus content in the ingredients is proportional according to the results. Then, it is diluted with clean water and sprayed 2-3 times every 7-10 days to apply foliar fertilizer.

[0080] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Application of a compound fertilizer in high-oil soybean planting, characterized in that: The following steps are involved: S1. Selecting a regional field where high-oil soybeans are planted, that is, obtaining planting land; S2. The soil in the planting land is tested by the NaHCO3 method and the Bray method respectively, and the effective phosphorus content in the planting land is calculated according to the soil effective phosphorus calculation formula, and the data obtained by the two methods are compared and confirmed to obtain the soil effective phosphorus content data; S3, adjusting the ratio of nitrogen, phosphorus and potassium in the compound fertilizer according to the soil effective phosphorus content data obtained in S2, and applying the prepared compound fertilizer to the planting land as a base fertilizer; S4, turning over the planting soil after applying the base fertilizer, using a harrow to rake the compound fertilizer into the soil within 15cm-25cm, and watering the turned soil to allow the compound fertilizer to penetrate; S5. When the soil is semi-dry, sow the selected high-oil soybean seeds in the planting land; S6. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. A topdressing should be carried out from the branching to the early flowering of high-oil soybeans, which has a good yield-increasing effect. At this time, the compound fertilizer is diluted with clean water to form a medium-concentration compound fertilizer water and irrigated into the soil; S7. The soil is tested by the NaHCO3 method and the Bray method to calculate the effective phosphorus content in the soil, and compound fertilizer is prepared according to the test results. Foliar fertilizer is applied to soybeans after they have formed pods during their growth process. At this time, the compound fertilizer is diluted with clean water to become a low-concentration compound fertilizer water and sprayed on the leaves of soybeans.

2. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: The calculation formula for the available phosphorus in the soil in S2 is: The calculation formula for the available phosphorus in the soil is: Available phosphorus content (unit: mg / kg) = phosphorus content (unit: mg / kg) × soil available phosphorus saturation coefficient.

3. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: If the effective phosphorus content of the soil in S2 is less than 10-20 mg / kg, it is low phosphorus; if the effective phosphorus content of the soil is 20-50 mg / kg, it is medium phosphorus; if the effective phosphorus content of the soil is higher than 50 mg / kg, it is high phosphorus.

4. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: In S3, if the calculated result of the effective phosphorus content in the soil is low phosphorus, the phosphorus in the compound fertilizer is 1.5 times that of nitrogen and potassium; if the calculated result of the effective phosphorus content in the soil is medium phosphorus, the phosphorus in the compound fertilizer is 1 times that of nitrogen and potassium; if the calculated result of the effective phosphorus content in the soil is high phosphorus, the phosphorus in the compound fertilizer is 0.5 times that of nitrogen and potassium.

5. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: The fertilization method in S3 adopts the land preparation and fertilization method.

6. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: The soil turning depth in S4 is between 15-25 cm.

7. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: The harrow in S4 adopts a vertical and horizontal cross harrowing method.

8. The use of a compound fertilizer in high-oil soybean planting according to claim 1, characterized in that: The frequency of foliar fertilizer application in S7 is: once every 7-10 days, and sprayed 2-3 times continuously.

9. A compound fertilizer comprising any one of claims 1 to 8, characterized in that: Includes the following ingredients: Nitrogen 14g / kg, phosphorus 7-21g / kg, potassium 14g / kg, diammonium phosphate 12g / kg, potassium sulfate 12g / kg, trace elements 11g / kg, nitrate phosphorus 5.7g / kg, potassium oxide 4.5g / kg, organic matter 4g / kg, spirotetramat suspension 0.8g / kg.

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