A corn-soybean rotation planting method based on carbon sequestration and emission reduction

Abstract

The application discloses a corn-soybean rotation planting method based on carbon fixation and emission reduction, and belongs to the field of agricultural technology, and comprises the following steps: obtaining the soil surface layer thickness of a corn and soybean planting plot; setting a soil middle layer and a soil bottom layer of the corn and soybean planting plot; obtaining the plot crop type at a future time; obtaining the corn and soybean straw returning amount ratio of the current plot; obtaining the corn and soybean straw returning amount based on the straw returning amount ratio and mixing the soil of the soil surface layer; separating part of the soil from the soil middle layer of the current plot and uniformly mixing the straw mixed soil; burying the new bottom layer soil into the position of the soil bottom layer of the current plot, adjusting the soil bottom layer of the current plot into a new soil middle layer, and adjusting the soil middle layer of the current plot into a new soil surface layer. The problems of short straw returning straw decomposition time and unreasonable straw returning amount setting are solved. Thus, based on effective straw returning operation, carbon fixation and emission reduction of the corn-soybean rotation planting area are realized.

Description

Technical Field

[0001] This application belongs to the field of agricultural technology, and in particular relates to a corn-soybean rotation planting method based on carbon sequestration and emission reduction. Background Technology

[0002] Corn and soybeans are important economic crops in my country, widely cultivated in Northeast my country. Their biological characteristics ensure good intercropping and crop rotation potential, leading to their widespread adoption in current farming practices. Under the backdrop of smart agriculture, carbon sequestration and emission reduction in crop cultivation have become a priority. Therefore, research is underway on how to achieve carbon sequestration and emission reduction while maintaining yield in corn-soybean rotation. Currently, the main method developed for carbon sequestration and emission reduction in corn-soybean rotation includes straw return to the field. However, current straw return methods typically involve direct return to the field, which often results in short decomposition times for the straw, making it difficult to fully utilize the nutrients produced after decomposition. This necessitates frequent topdressing, hindering the achievement of carbon sequestration and emission reduction. Furthermore, inappropriate amounts of straw returned to the field can generate excessive greenhouse gases, reducing the effectiveness of carbon sequestration and emission reduction.

[0003] Therefore, how to reasonably extend the decomposition time of straw returned to the field, and at the same time reasonably set the amount of straw returned to the field, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the problems of unreasonable straw return amounts and insufficient straw decomposition time in existing corn-soybean rotation methods, this application discloses a corn-soybean rotation method based on carbon sequestration and emission reduction. Specifically, it includes:

[0005] A corn-soybean rotation method based on carbon sequestration and emission reduction, the method comprising the following steps:

[0006] Based on the root depth of corn and soybean, the topsoil thickness of corn and soybean planting plots was obtained respectively.

[0007] Based on the thickness of the topsoil of the corn and soybean planting plots, the middle and bottom soil layers of the corn and soybean planting plots were obtained respectively.

[0008] Based on the corn and soybean rotation cycle, obtain the types of crops that can be cultivated on the plot in the future;

[0009] Based on the type of crops to be cultivated on the plot in the future, obtain the ratio of straw returned to the field for corn and soybeans on the current plot.

[0010] Based on the ratio of corn and soybean straw returned to the field in the current plot, corn and soybean straw are obtained and mixed with the topsoil to obtain straw-mixed soil.

[0011] Separate a portion of the soil from the middle layer of the current plot and mix it evenly with the straw-mixed soil to obtain a new bottom layer soil;

[0012] The new subsoil is buried at the location of the current plot's subsoil layer to obtain a new subsoil layer. The current plot's subsoil layer is adjusted to become a new middle soil layer, and the current plot's middle soil layer is adjusted to become a new surface soil layer.

[0013] Optionally, obtaining the topsoil thickness of corn and soybean planting plots based on root depth includes:

[0014] Obtain the corn and soybean varieties planted in the corn and soybean rotation area, and obtain the root depth of the corn and soybean varieties;

[0015] Obtain the maximum root depth of the corn and soybean varieties, and set the maximum root depth of the corn and soybean varieties as the soil surface thickness of the current planting plot of corn and soybean.

[0016] Optionally, obtaining the middle and bottom soil layers of the corn and soybean planting plots based on the topsoil thickness includes:

[0017] To determine the maximum soil tillage depth that can be obtained within the corn and soybean rotation area;

[0018] The topsoil thickness of corn and soybeans is removed from the maximum soil tillage depth to obtain the straw return layer;

[0019] The straw return layer is divided into layers to obtain the middle and bottom soil layers of the current corn and soybean planting plots.

[0020] Optionally, the step of obtaining the future crop type for a plot of land based on the corn and soybean rotation cycle includes:

[0021] Obtain the rotation cycle of corn and soybeans, and obtain the future cultivated land plots of corn and soybeans in the future tillage-harvest cycle;

[0022] Establish the correspondence between the aforementioned tillage-harvest cycle and future cultivated plots of corn and soybeans to obtain the correspondence between plots and crops;

[0023] Based on the correspondence between the plots and crops, the types of crops to be cultivated for all plots in the future time period are obtained.

[0024] Optionally, obtaining the ratio of corn and soybean straw returned to the field for the current plot based on the future crop type of the plot includes:

[0025] Based on the crop type of the plot at the future time, obtain the future nutrient requirements of the soil surface corresponding to the crop type of the plot in the second tillage-harvest cycle.

[0026] Obtain the mass of various nutrients generated per unit weight of corn and soybean straw during the decomposition process;

[0027] Based on the mass of various nutrients generated during the decomposition process of corn and soybean straw per unit weight, and the required amount of each nutrient, the ratio of corn and soybean straw returned to the field for the current plot is obtained.

[0028] Optionally, the step of obtaining the corn and soybean straw return ratio for the current plot based on the mass of various nutrients generated during the decomposition process of the unit weight of corn and soybean straw, and the required amount of each nutrient, includes:

[0029] The amount of various nutrients required by a unit weight of corn and soybean straw returned to the field in the current plot, located in the bottom layer of the soil, and generated within a tillage-harvest cycle, is obtained to obtain the mass of various nutrients from the decomposition of corn and soybean straw in the bottom layer of the soil.

[0030] The amount of various nutrients required by a unit weight of corn and soybean straw returned to the field in the current plot, located in the middle layer of the soil, and generated within a tillage-harvest cycle, is obtained to obtain the mass of various nutrients from the decomposition of corn and soybean straw in the middle layer of the soil.

[0031] The masses of various nutrients generated by the decomposition of corn stalks in the middle layer of soil and the masses of various nutrients generated by the decomposition of corn stalks in the bottom layer of soil are summed separately. The masses of various nutrients generated by the decomposition of soybean stalks in the middle layer of soil and the masses of various nutrients generated by the decomposition of soybean stalks in the bottom layer of soil are summed separately to obtain the masses of various nutrients generated by the decomposition of corn and soybean straw during the decomposition process.

[0032] Based on the future nutrient requirements of the soil surface and the mass of various nutrients generated during the decomposition of corn and soybean straw, the ratio of corn and soybean straw returned to the field in the current plot is obtained.

[0033] Optionally, obtaining the ratio of corn and soybean straw returned to the field in the current plot based on the future nutrient requirements of the soil surface and the mass of various nutrients generated during the decomposition of corn and soybean straw includes:

[0034] Based on the mass of various nutrients generated during the decomposition process of corn and soybean straw returned to the field, and the future demand for various nutrients in the soil surface, a determinant equation is established.

[0035] Solve the determinant equation to obtain the alternative straw return ratio for corn and soybeans in the current plot;

[0036] Obtain all corn and soybean straw combinations configured according to the aforementioned alternative straw return ratio, and obtain the volume of the corn and soybean straw combinations after crushing and uniformly mixing.

[0037] The alternative straw return ratio is obtained when the volume of the crushed and uniformly mixed corn and soybean straw combination is not greater than the volume of the bottom soil layer of the current plot. The corresponding alternative straw return ratio is the ratio of corn and soybean straw return ratio of the current plot.

[0038] Optionally, the step of obtaining corn and soybean straw return-to-the-field ratios based on the current plot, and mixing it with the topsoil to obtain straw-mixed soil, includes:

[0039] Based on the ratio of corn and soybean straw returned to the field in the current plot, the weight of corn and soybean straw returned to the field is determined respectively.

[0040] The straw return to the field is configured based on the weight of the corn and soybean straw, and the straw is crushed and uniformly mixed to obtain mixed straw.

[0041] The topsoil of the current plot is evenly mixed with the mixed straw to obtain straw-mixed soil.

[0042] Optionally, separating a portion of soil from the middle layer of the current plot and uniformly mixing it with the straw-mixed soil to obtain a new bottom layer soil includes:

[0043] Identify the bottom region of the middle soil layer of the current plot, and separate the bottom layer of soil from the middle soil layer of the current plot to obtain the separated soil.

[0044] The separated soil and the straw-mixed soil are mixed evenly to obtain a new bottom soil.

[0045] Optionally, the step of burying the new subsoil at the location of the current plot's subsoil layer to obtain a new subsoil layer, adjusting the current plot's subsoil layer to a new middle soil layer, and adjusting the current plot's middle soil layer to a new topsoil layer includes:

[0046] The new subsoil is buried at the location of the current subsoil layer to form a new subsoil layer;

[0047] The current soil sublayer is laid on the new soil sublayer, and the current soil sublayer becomes the new soil middle layer.

[0048] The soil middle layer of the current plot is laid on the new soil middle layer, and the soil middle layer of the current plot becomes the new soil surface layer.

[0049] The beneficial effects of this application include:

[0050] 1. The decomposition time of straw returned to the field is extended. In the technical solution of this application, the straw returned to the field is buried in the bottom layer of the soil, and the bottom layer is adjusted to the middle layer in the following year, and it is adjusted to the top layer of the soil in the third year. Then it is actually used for planting corn or soybeans. The decomposition time of the straw returned to the field is no less than 2 years, which fully extends the decomposition time, effectively increases the quality of nutrients, and reduces greenhouse gas emissions.

[0051] 2. Achieving a reasonable arrangement of straw for returning to the field. In the technical solution of this application, corn straw and soybean straw are mixed. The nutrient content of these two types of straw is different. After mixing, it can effectively ensure that the straw returned to the field can provide all types of nutrients. The straw ratio is also designed to ensure a reasonable arrangement of straw for returning to the field.

[0052] 3. Achieves high decomposition of straw returned to the field. In the technical solution of this application, during the soil preparation of the bottom layer, the soil of the middle layer is also uniformly mixed in. The middle layer is essentially the bottom layer of soil laid in the previous year. After a year of decomposition, the content of microorganisms and decomposition promoters in the straw in it has been greatly increased. After mixing, it can play a good role in promoting the decomposition of straw in the new bottom layer of soil, thereby ensuring that the straw returned to the field is highly decomposed. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments of this application or the prior art will be briefly introduced below. Obviously, the following description is only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are used to provide a further understanding of this disclosure and constitute a part of the specification. They are used together with the following detailed description to explain this disclosure, but do not constitute a limitation of this disclosure. In the drawings:

[0054] Figure 1 A flowchart illustrating a corn-soybean rotation planting method based on carbon sequestration and emission reduction, provided in an embodiment of this application;

[0055] Figure 2A schematic diagram of soil layer distribution in a corn-soybean rotation planting method based on carbon sequestration and emission reduction provided in an embodiment of this application;

[0056] Figure 3 This is a schematic diagram of the plot distribution in a corn-soybean rotation planting method based on carbon sequestration and emission reduction, provided in an embodiment of this application. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, in the embodiments of this application, "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0058] Corn and soybeans are the main economic food crops in Northeast China. In recent years, farmers have begun to explore ways to jointly increase their yields, developing methods such as crop rotation and intercropping, and actively exploring straw return to the field. However, the overall climate in Northeast China is relatively dry, and the period of low temperatures is long each year. After straw is returned to the field, the decomposition time is short, which not only fails to fully release the nutrients in the straw, but also leads to excessive greenhouse gas production due to incomplete decomposition, making it difficult to achieve carbon sequestration and emission reduction. In addition, when rotating corn and soybeans, the proportion of straw returned to the field is the same in each plot, and the amount is entirely based on experience. This makes it difficult to fully realize the role of straw in promoting corn and soybean yields, and unreasonable straw return can easily hinder carbon sequestration and emission reduction efforts.

[0059] To address the aforementioned problems, this application discloses a corn-soybean rotation planting method based on carbon sequestration and emission reduction, such as... Figure 1 The diagram shown is a flowchart of a corn-soybean rotation planting method based on carbon sequestration and emission reduction provided in an embodiment of this application. The method includes the following steps:

[0060] S110. Based on the root depth of corn and soybean, obtain the topsoil thickness of corn and soybean planting plots respectively.

[0061] S120. Based on the thickness of the topsoil of the corn and soybean planting plots, obtain the middle soil layer and bottom soil layer of the corn and soybean planting plots respectively.

[0062] S130. Based on the corn and soybean rotation cycle, obtain the crop type to be cultivated on the plot in the future.

[0063] S140. Based on the type of crop to be cultivated in the plot at the future time, obtain the ratio of straw returned to the field for corn and soybeans in the current plot.

[0064] S150. Based on the ratio of corn and soybean straw returned to the field in the current plot, obtain corn and soybean straw returned to the field, and mix it with the topsoil to obtain straw-mixed soil.

[0065] S160. Separate a portion of the soil from the middle layer of the current plot and mix it evenly with the straw-mixed soil to obtain a new bottom layer soil.

[0066] S170. The new bottom soil is buried at the position of the bottom soil layer of the current plot to obtain a new bottom soil layer. The bottom soil layer of the current plot is adjusted to a new middle soil layer, and the middle soil layer of the current plot is adjusted to a new top soil layer.

[0067] The beneficial effects of the above steps are that they can extend the decomposition time of straw returned to the field, while ensuring the reasonable setting of the ratio and amount of straw returned to the field, thereby fully improving the rationality of the straw returned to the field, so as to achieve the effect of carbon sequestration and emission reduction while increasing yield.

[0068] The following will explain the specific details of all the above steps:

[0069] As described in step S110, the purpose of this step is to determine the root depth of corn and soybeans during cultivation, thereby determining the thickness of the topsoil layer based on the root depth, which lays the foundation for subsequent soil stratification. Specifically:

[0070] S111. Obtain the corn and soybean varieties planted in the corn and soybean rotation area, and obtain the root depth of the corn and soybean varieties.

[0071] The purpose of this step is that, given the large area of ​​corn and soybean cultivation in Northeast China, it is possible to consider adopting widespread corn and soybean rotation and intercropping methods for large plots. Overall, the root depth distribution of corn and soybean is different, and the root depth of corn and soybean will be distributed in a certain range. Based on the parameters of this range, the soil surface parameters can be determined.

[0072] This includes obtaining the varieties of corn and soybeans that are typically planted throughout the region, and obtaining the root depth of different varieties.

[0073] In addition, the root depth of the new variety can be obtained based on the experimental information of the new variety.

[0074] S112. Obtain the maximum root depth of the corn and soybean varieties, and set the maximum root depth of the corn and soybean varieties as the soil surface thickness of the corn and soybean planting plot.

[0075] The purpose of this step is to determine the appropriate topsoil thickness for different crop types based on root depth parameters of corn and soybean varieties.

[0076] The maximum root depth values ​​for corn and soybean varieties were determined based on information about different varieties, rather than by obtaining the maximum root depth value of a single plant.

[0077] Among them, the maximum root depth can be directly used as the thickness of the soil surface layer where corn and soybeans are located during cultivation.

[0078] In some embodiments, the maximum root depth of corn and soybean can be extended by a certain depth, and the distance between the ground surface and this depth range can be determined. The area between these two is the soil surface layer, and the distance is the thickness of the soil surface layer.

[0079] The beneficial effect of step S110 is that by determining the root depth of corn and soybeans, the thickness of the soil surface layer can be determined, thus achieving a reasonable determination of the soil surface layer thickness.

[0080] As described in step S120, the purpose of this step is to determine the middle and subsoil layers based on the determination of the topsoil layer, so as to ensure that the position of the soil layers can be adjusted when implementing crop rotation. Specifically:

[0081] S121. Obtain the maximum soil tillage depth that can be obtained within the corn and soybean rotation area.

[0082] The purpose of this step is to determine the tillage depth, since deep tillage of the entire land is not permitted in areas where corn and soybeans are rotated. Considering that mechanized operations are required during rotational planting, the maximum soil tillage depth can be determined directly, thus determining the depth of the entire soil layer.

[0083] The maximum soil tillage depth can be set based on the soil tillage machinery parameters.

[0084] The maximum soil tillage depth can be determined based on the soil subsurface environment of the rotational tillage area.

[0085] In some embodiments, the maximum soil tillage depth can be determined directly by agricultural production process technicians.

[0086] S122. Remove the topsoil thickness of corn and soybeans from the maximum soil tillage depth to obtain the straw return layer.

[0087] The purpose of this step is that, considering the overall depth of the soil layer and the decomposition time of the straw, this application believes that it is better to divide the soil layer of the entire area into three levels. Based on the acquisition of the soil surface layer, the other soil levels are determined.

[0088] The maximum soil tillage depth is taken as the entire planting soil layer to obtain the overall soil layer depth.

[0089] By directly removing the topsoil layer at the maximum depth, a straw return layer can be obtained.

[0090] The straw return layer refers to the layer where straw is mainly returned to the field for decomposition. Based on the distribution results, the straw return layer includes the middle soil layer and the bottom soil layer.

[0091] S123. The straw return layer is divided into layers to obtain the middle soil layer and bottom soil layer of the current corn and soybean planting plot.

[0092] The purpose of this step is to separate the subsoil and middle soil layers in the land to obtain specific strata.

[0093] After obtaining the straw return layer, the straw return layer can be divided equally to directly obtain the middle soil layer and the bottom soil layer.

[0094] In some embodiments, the thickness of the straw-returned layer is adjusted according to the type of crop to be planted in the future. It is important to note that the future timeframe in this method refers to the type of crop to be planted in the third year. For example, if soybeans are planted this year, corn the following year, and soybeans are planted again in the third year, then the thickness of the bottom layer for this year can be less than the thickness of the middle layer. Figure 2 The diagram shown is a schematic representation of soil layer distribution in a corn-soybean rotation planting method based on carbon sequestration and emission reduction provided in this application embodiment. The dashed box indicates the type of crop planted on the plot represented by the box. Both corn and soybean plots are divided into three layers: topsoil, middle soil, and bottom soil. It is also evident that the topsoil thickness of the soybean plot is less than that of the corn plot. Of course, the specific distribution of each layer needs to be determined based on the type of crop to be planted in the future. In addition, the dashed arrows indicate the direction of transmission of each soil layer.

[0095] The beneficial effect of step S120 is that by dividing the soil into subsoil and middle soil layers, the vertical stratification parameters of the entire soil can be obtained, which can better adapt to the soil thickness requirements of the crop types cultivated in corn and soybean rotation plots.

[0096] As described in step S130, the purpose of this step is that, for corn and soybean rotation areas, the crops planted on the plots may change annually. Therefore, to ensure that the soil surface layer is compatible with the crop at the appropriate planting time, it is necessary to determine the future crop type for the plots to be cultivated, in order to specifically determine the corresponding soil layer configuration scheme. Specifically:

[0097] S131. Obtain the rotation cycle of corn and soybean, and obtain the future cultivated plots of corn and soybean in the future cultivation-harvest cycle.

[0098] The purpose of this step is to determine the plots of land where corn and soybeans will be cultivated in the future, which is equivalent to determining the types of crops to be cultivated on different plots in different time periods.

[0099] Specifically, based on the plot distribution plan within the entire corn and soybean planting area, the corn and soybean planting plots for the future cultivation-harvest cycle are determined.

[0100] The so-called cultivation-harvest cycle refers to the entire period from sowing to harvesting of corn or soybeans. Of course, a cultivation-harvest cycle can also be considered as one year.

[0101] Among them, such as Figure 3 The diagram shown is a plot distribution diagram in a corn-soybean rotation planting method based on carbon sequestration and emission reduction provided in an embodiment of this application. It can be clearly seen that the areas of intercropped soybean and corn plots are different. Usually, the area ratio of soybean to corn plots is 1:2. In agricultural production, the commonly used scheme is 2 rows of soybeans and 4 rows of corn, or 3 rows of soybeans and 6 rows of corn. Therefore, in specific processing, it is necessary to determine the future cultivated plots according to the rotation cycle, rather than simply alternating the crop types on the same plot.

[0102] S132. Establish the correspondence between the aforementioned tillage-harvest cycle and the future cultivated plots of corn and soybeans to obtain the correspondence between plots and crops.

[0103] The purpose of this step, considering the overall technical objective of this application, is to ensure that the types and amounts of nutrients in the topsoil of the planted crop can support its needs when the corresponding crop is planted on the plot. Therefore, the correspondence between future corn and soybean planting plots and crops is determined here.

[0104] This involves obtaining the order of all crops planted within each tillage-harvest cycle in the future.

[0105] Among them, based on the order of crop cultivation in each plot, the types of crops to be planted in each plot in the future are determined.

[0106] This requires determining the correspondence between plots of land and crops to be planted in the future.

[0107] If the current time period is used as the base time, then it is necessary to determine the types of crops to be planted in the plots in the second year. In other words, in all the established plot and crop correspondences, it is necessary to establish the correspondence between each plot and the crops to be planted in the second year in the future.

[0108] The so-called plot-to-crop correspondence refers to the types of crops that need to be planted on a plot of land in the future.

[0109] S133. Based on the correspondence between the plots and crops, obtain the types of crops to be cultivated on all plots in the future time period.

[0110] The purpose of this step is to determine the crop types to be cultivated in all plots within the entire corn-soybean rotation area over the future time period.

[0111] Based on the obtained correspondence between land parcels and crops, the types of crops to be cultivated in the future can be directly determined.

[0112] Among these methods, the depth relationships of each soil layer can be determined based on the types of crops to be cultivated in the future.

[0113] In some embodiments, after determining the type of crop to be cultivated in the future, the corresponding soil thickness information is set synchronously. As shown in Table 1:

[0114] ;

[0115] Where N represents the information for that year. Since this application obtains soil information based on adjustments to soil layer location, it is also necessary to determine the crop information planted last year in order to formulate a crop planting plan for future periods. The parameters H1~H3 and L1~L3 represent the three soil layer thicknesses corresponding to the planting processes of corn and soybean, respectively.

[0116] The beneficial effect of step S130 is that by determining the types of crops planted on each plot in each tillage-harvest cycle within a future time period, it is possible to better set the soil layer thickness information and the quality requirements of various nutrients in the soil surface layer within the future time period.

[0117] As described in step S140, the purpose of this step is to determine the nutrient requirements of the topsoil at the time the crop type will be determined in the future, after identifying the crop type to be grown on the plot. This allows for the deduction of information regarding straw return to the soil subsoil at the current time point. Specifically:

[0118] S141. Based on the crop type of the plot at the future time, obtain the future nutrient requirements of the soil surface corresponding to the crop type of the plot in the second future tillage-harvest cycle.

[0119] The purpose of this step is to determine the nutrient requirements of the crops to be planted based on the relationship between plots and crop types within the relevant tillage-harvest cycle over a future time period.

[0120] This involves determining the appropriate crop for each plot of land in the future.

[0121] In this application, the decomposition time of straw underground is 2 years. This means that, starting from the current time point, the straw buried in the soil layer during the current cultivation-harvest cycle will reach the soil surface during the second cultivation-harvest cycle. Therefore, it is necessary to obtain the crop type of the plot in the second cultivation-harvest cycle and determine the nutrient requirements of the soil surface when the cycle arrives.

[0122] The so-called future soil surface layer refers to the soil surface layer at the time of the second tillage-harvest cycle.

[0123] This requires determining the nutrient requirements of the crop during its growth process based on the type of crop grown on the plot. These nutrients include nitrogen, phosphorus, potassium, and organic matter.

[0124] In some embodiments, it may be sufficient to obtain only the total amount or proportion of various nutrients required by the topsoil layer during the seedling stage of the crop type.

[0125] S142. Obtain the mass of various nutrients generated per unit weight of corn and soybean straw during the decomposition process.

[0126] The purpose of this step is to obtain the amount of nutrients that can be generated per unit weight of corn and soybean straw during the decomposition process, and to use this parameter for subsequent proportioning analysis.

[0127] Among them, the analysis of the decomposition process of corn straw returned to the field can be based on experimental field methods to determine the quality of various nutrients that can be provided in the soil bottom layer and middle layer environment, and finally reach the soil surface.

[0128] Among them, the analysis of the decomposition process of soybean straw can be based on experimental field experiments to determine the quality of various nutrients that can be provided in the bottom and middle soil environments and finally reach the soil surface.

[0129] In the analysis of the various nutrients that corn and soybean straw can provide by returning them to the field, laboratory simulations can also be used for measurement.

[0130] In the experimental field-based measurements, considering that the straw returned to the field needs to be evenly mixed with the topsoil, and that the topsoil must contain various nutrients, it is also necessary to measure the quality of various nutrients in the topsoil. The measurement results are then discarded when the straw is finally transferred to the topsoil to accurately measure the quality of nutrients that the straw can provide.

[0131] S143. Based on the mass of various nutrients generated during the decomposition process of the corn and soybean straw per unit weight, and the demand for each of the various nutrients, obtain the ratio of corn and soybean straw returned to the field in the current plot.

[0132] The purpose of this step is to ensure that, by determining the ratio of corn and soybean straw returned to the field, the straw, after decomposition, reaches the soil surface in a way that perfectly matches the needs of future crop types.

[0133] The so-called ratio of corn and soybean straw returned to the field in the current plot refers to the ratio of corn and soybean straw among the straw returned to the field after the crops in the current plot are harvested.

[0134] This involves determining the required amount of nutrients and the amount of various nutrients that a unit weight of straw can provide in order to determine the appropriate ratio of straw to be returned to the field.

[0135] The beneficial effect of step S140 is that by determining the straw ratio, it can be fully guaranteed that after two years of decomposition, the quality of various nutrients provided by the straw returning to the field can meet the growth requirements of corn and soybeans.

[0136] To better illustrate the technical method of step S143, step S143 will now be described in detail:

[0137] S1431. Obtain the nutrient requirements of corn and soybean straw per unit weight in the current plot, located in the bottom layer of the soil, and generated within one tillage-harvest cycle, so as to obtain the mass of various nutrients from the decomposition of corn and soybean straw in the bottom layer of the soil.

[0138] The purpose of this step is to determine the amount of various nutrients required when a unit weight of corn and soybean straw decomposes in the bottom layer of the soil.

[0139] As described in step S142, the quality of various nutrients produced by straw returning to the field after decomposition in the bottom layer of the soil after a period of tillage and harvest can be obtained based on laboratory simulation or experimental field test.

[0140] S1432. Obtain the nutrient requirements of corn and soybean straw per unit weight in the current plot, located in the middle layer of the soil, and generated within one tillage-harvest cycle, so as to obtain the mass of various nutrients from the decomposition of corn and soybean straw in the middle layer of the soil.

[0141] The purpose of this step is to determine the amount of various nutrients required when a unit weight of corn and soybean straw decomposes in the middle layer of soil.

[0142] As described in step S142, the quality of various nutrients produced by straw returning to the field after decomposition in the middle layer of the soil after a tillage-harvest period can be obtained based on laboratory simulation or experimental field test.

[0143] S1433. Sum the mass of various nutrients from the decomposition of corn stalks in the middle layer of soil and the mass of various nutrients from the decomposition of corn stalks in the bottom layer of soil, and sum the mass of various nutrients from the decomposition of soybean stalks in the middle layer of soil and the mass of various nutrients from the decomposition of soybean stalks in the bottom layer of soil, to obtain the mass of various nutrients generated by the decomposition of corn and soybean straw during the decomposition process.

[0144] The purpose of this step is to directly obtain the mass of various nutrients that corn and soybean straw can produce individually during the two tillage-harvest cycles by analyzing the amount of nutrients that can be produced during the decomposition of corn and soybean straw in the middle and bottom layers of the soil.

[0145] Among them, the amount of various nutrients generated during the two tillage-harvest cycles in the decomposition of corn stalks was established.

[0146] Among them, the amount of various nutrients generated during the two tillage-harvest cycles in the decomposition of soybean straw was established.

[0147] In the specific analysis of the amount generated, it is necessary to establish a correspondence between straw type and the type of nutrient itself in order to obtain the mass of various nutrients. For example, the forms of corn straw-potassium element-a, corn straw-phosphorus element-b, and soybean straw-nitrogen element-c were established to obtain the correspondence between straw type-element type-nutrient mass.

[0148] S1433. Based on the future nutrient requirements of the soil surface and the mass of various nutrients generated during the decomposition of corn and soybean straw, obtain the ratio of corn and soybean straw returned to the field in the current plot.

[0149] The purpose of this step is to calculate the specific ratio of various nutrients that can be provided per unit weight of corn and soybean straw, thereby obtaining the amount of corn and soybean straw to be added in the current soil subbase construction.

[0150] In this case, once the future nutrient requirements of the soil surface layer are determined, the determination results of the quantities of various nutrients can be obtained.

[0151] To better illustrate the specific steps of S1433, the technical solution for this part will be explained in detail below. Specifically:

[0152] S14331. Based on the mass of various nutrients generated during the decomposition process of the corn and soybean straw returned to the field, and the future demand for various nutrients in the soil surface, establish a set of equations.

[0153] The purpose of this step is to establish a system of equations to determine the future requirements for the quality of various nutrients in the soil surface and the correlation between the quantities of various nutrients.

[0154] The established system of equations can be expressed as:

[0155] ;

[0156] in, T 1 ~ T n This indicates the future demand for various nutrients in the topsoil layer; M c1 ~ M cn This indicates the mass of nutrients generated during the decomposition of corn stalks, corresponding to various types of nutrients in the future soil surface. P c1 ~ P cn This indicates the corresponding amount of corn stalk input based on the quality of nutrients generated during the corn stalk decomposition process and the future demand for various nutrients in the soil surface. M s1 ~ M sn This indicates the mass of nutrients generated during the decomposition of soybean straw, corresponding to various types of nutrients in the future soil surface. P s1~ P sn This indicates the corresponding amount of corn straw input based on the quality of nutrients generated during the soybean straw decomposition process and the future demand for various nutrients in the soil surface.

[0157] S14332. Solve the system of equations to obtain the alternative straw return ratio for corn and soybeans in the current plot.

[0158] The purpose of this step is to solve the equations after they have been constructed in order to obtain the possible straw return ratio for the field.

[0159] Based on the above equations, each of the relevant ( P c1 , P s1 )to( P cn , P sn Multiple data sets of combined types.

[0160] Among them, based on the requirements of each nutrient in the future soil surface, the input of corn and soybean straw can be obtained in multiple sets of data.

[0161] This requires obtaining a set of data on the input amounts of all corn and soybeans for each nutrient, based on its future nutrient requirements for the soil surface.

[0162] S14333. Obtain all corn and soybean straw combinations configured according to the alternative straw return ratio, and obtain the volume of the corn and soybean straw combinations after crushing and uniformly mixing.

[0163] The purpose of this step is to configure corn and soybean straw based on the obtained alternative straw return ratios, and to conduct volume analysis on the crushed and uniformly mixed straw to lay the foundation for judging each array.

[0164] Among them, the amount of straw required to configure all the alternative straw ratios according to the obtained data sets is obtained, and the volume is obtained.

[0165] For all the obtained ratio data sets, this application is not intended to guarantee that all nutrient quality can be fully provided by straw based entirely on straw returning to the field. Rather, it allows for the existence of a certain nutrient that is higher or lower than the required nutrient quality in the selected straw ratio, but the probability of this occurring should be minimized to the greatest extent possible.

[0166] Before determining the volume, it is necessary to pre-select the appropriate ratio of straw to be returned to the field. Specifically, based on soybean straw or corn straw, a limit value is set for that type of straw. For example, the selected amount of corn straw is... P cc Then, for all arrays, the amount of corn stalks to be added is the amount of soybean stalks to be added when that value is selected.

[0167] In this process, after obtaining the amount of corn stalks applied and determining the amount of soybean stalks applied across all arrays based on this value, the average amount of soybean stalks applied can be obtained, as shown in the equation:

[0168] ;

[0169] in, This indicates the amount of soybean straw used; T i Indicating the future topsoil layer i The required amount of various nutrients; M ci Indicating the future topsoil layer i The mass of the corresponding nutrients generated during the decomposition process of corn stalks for each type of nutrient; P cc This indicates the selected amount of corn stalks to be used; M si Indicating the future topsoil layer i The mass of the corresponding nutrients generated during the decomposition process of soybean straw for each type of nutrient; i An index representing the type of nutrient; n This represents the total index of nutrient types.

[0170] In some embodiments, the parameters can also be adjusted before using the above equations. P cc To perform analysis and obtain the effects of this value on all generated [products / services]. P si The variances are calculated, and the value corresponding to the smallest variance is selected. P cc And based on this value, we obtain Calculation results.

[0171] S14334. Obtain the alternative straw return ratio corresponding to the crushed and uniformly mixed volume of the corn and soybean straw combination, which is not greater than the soil bottom volume of the current plot. The corresponding alternative straw return ratio is the ratio of corn and soybean straw return ratio of the current plot.

[0172] The purpose of this step is to select the best ratio scheme in large-scale corn-soybean rotation areas, even after screening in step S14333, considering the characteristics of the terrain and land itself, ensuring that the land is flat. Therefore, this step can achieve the reasonable determination of the ratio parameters.

[0173] When determining the ratio of candidate straw to be returned to the field, it is necessary to obtain the volumes of both and determine the volume produced after crushing and uniform mixing.

[0174] The resulting volume needs to be compared with the volume of the bottom layer of soil in the current plot. If the former is found to be larger than the latter, it means that returning the soil to the field will encroach on the position of other soil layers, so it needs to be removed from the alternative mix ratios.

[0175] The process of determining the subsoil volume of the current plot requires obtaining the thickness of the topsoil layer based on the crop type to be planted in the next tillage-harvest cycle. Since the plot area is known, the volume can be determined. In other words, determining the subsoil volume of the current plot requires determining the ratio of corn and soybean straw returned to the field based on the future crop type.

[0176] As described in step S150, the purpose of this step is to treat the soil in the subsoil layer of the current site so that it can be directly buried within the already determined subsoil layer area. Specifically:

[0177] S151. Based on the ratio of corn and soybean straw returned to the field in the current plot, determine the weight of corn and soybean straw returned to the field respectively.

[0178] The purpose of this step is to determine the amount of straw to be applied and to obtain the corresponding amount of straw based on the determined result.

[0179] The weight of corn and soybean straw returned to the field was obtained based on the ratio of straw returned to the field and the data obtained.

[0180] Alternatively, the obtained straw can be directly mixed to facilitate subsequent crushing and mixing.

[0181] S152. Based on the weight of the corn and soybean straw returned to the field, the straw is configured and crushed and uniformly mixed to obtain mixed straw.

[0182] The purpose of this step is to process the straw before it is returned to the field, thereby facilitating subsequent straw return operations.

[0183] The corn stalks and soybean stalks obtained were pulverized and then mixed evenly after pulverization.

[0184] One method involves compressing the straw after crushing and mixing to prevent the volume of the straw from exceeding the bottom layer of the soil.

[0185] The length of the crushed straw can be set according to existing research results or the experience of technicians.

[0186] S153. The topsoil of the current plot is evenly mixed with the mixed straw to obtain straw-mixed soil.

[0187] The purpose of this step is to improve the soil's nutrient content and to fully increase the nutrient content of the topsoil in the future, which requires the preparation of a new soil subsoil.

[0188] After harvesting the current plot, all the topsoil of the current plot is obtained directly.

[0189] This process involves mixing the topsoil with the crushed and mixed straw, ensuring that the soil and the straw are thoroughly mixed.

[0190] In order to ensure that the obtained straw-mixed soil can be completely buried in the bottom layer of the soil, appropriate pressure can be applied to the straw-mixed soil to reduce its volume.

[0191] In some embodiments, considering that the soil in the deeper layers of the land is already in a hard state, pressure needs to be applied to the straw-mixed soil in all cases to ensure that the new soil sublayer can support other soil layers.

[0192] The beneficial effect of step S150 is that after obtaining the new ratio of straw returned to the field in the bottom layer of the soil, the straw needs to be treated and the treated straw is mixed evenly with the current top layer of soil to ensure that the nutrients in the top layer of soil are evenly distributed in the future.

[0193] As described in step S160, the purpose of this step is that the straw returned to the field in the middle layer of the soil has essentially undergone two years of decomposition, resulting in more decomposition-promoting microorganisms and more decomposition accelerators. Therefore, if a portion of the soil in the middle layer is evenly mixed with the bottom layer soil, the decomposition of the returned straw in the new bottom layer soil can be better promoted. Specifically:

[0194] S161. Determine the bottom region of the middle soil layer of the current plot, and separate the bottom layer of soil from the middle soil layer of the current plot to obtain the separated soil.

[0195] The purpose of this step is to obtain a portion of the middle layer of soil in the current plot and separate it.

[0196] Among them, a certain thickness from bottom to top in the current soil middle layer is considered to be the bottom area of ​​the soil middle layer.

[0197] The subsequent settings for the bottom area can be determined based on experience, and this application does not impose any restrictions.

[0198] In the specific bottom area separation, a soil replacement tillage machine can be used to adjust the soil collection thickness in the middle layer of the soil, and the remaining soil after collection is regarded as part of the new bottom layer of soil, and the two parts of soil are thoroughly mixed.

[0199] S162. The separated soil and the straw-mixed soil are mixed evenly to obtain a new bottom soil.

[0200] The purpose of this step is to obtain new subsoil and ensure that the rate of decomposition of straw returned to the field in this soil is increased.

[0201] After obtaining the separated soil, the separated soil and the straw-mixed soil are thoroughly and evenly mixed to obtain the new bottom soil.

[0202] In the process of soil mixing and treatment, various types of agricultural machinery that have been developed so far, as well as soil replacement tillage machines among agricultural machinery, can be used to treat the soil.

[0203] The beneficial effect of step S160 is that when some of the soil in the middle layer of the soil is mixed into the straw-mixed soil, the microorganisms and decomposition promoters in the middle layer of the soil can be fully utilized to increase the decomposition rate of the straw returned to the field in the new bottom soil.

[0204] As described in step S170, the purpose of this step is to apply the new subsoil, after it has been obtained, to the corn-soybean rotation planting area to establish a new soil layer. Specifically:

[0205] S171. The new subsoil is buried at the location of the current subsoil layer to form a new subsoil layer.

[0206] The purpose of this step is to fill in a new soil subbase.

[0207] In this method, the newly obtained subsoil is directly placed into the subsoil layer of the current plot, and the newly constructed area becomes the new subsoil layer.

[0208] In some embodiments, after the new soil subbase is constructed, it is necessary to carry out a certain degree of compaction to ensure that the new soil subbase can effectively support the middle and top layers of the soil.

[0209] S172. Lay the current soil sublayer on the new soil sublayer, and the current soil sublayer becomes the new soil middle layer.

[0210] The purpose of this step is to construct other layers after the new soil sublayer has been obtained, with the primary layer being the middle soil layer.

[0211] This process involves excavating the subsoil layer of the current plot using machinery such as a soil replacement tillage machine, and then laying a new subsoil layer on top of it.

[0212] In some embodiments, rotary tillage is performed on the bottom layer of the current plot to loosen the soil and improve the permeability of the middle layer of the soil, thus preventing poor drainage in subsequent crop cultivation due to poor permeability of the middle layer of the soil.

[0213] S173. Lay the middle layer of soil of the current plot on the new middle layer of soil, and the middle layer of soil of the current plot becomes the new top layer of soil.

[0214] The purpose of this step is to construct a new topsoil layer after the new middle soil layer has been obtained.

[0215] In this process, the middle layer of soil in the current plot is excavated by relevant machinery, such as a soil replacement tillage machine, and after a new middle layer of soil is laid, the middle layer of soil in the current plot is directly placed on the new middle layer of soil to obtain a new soil surface layer.

[0216] After obtaining the new topsoil, it means that the plot needs to be cultivated for corn or soybeans. Therefore, the middle layer of the current plot, that is, the new topsoil, needs to be rotary tilled to loosen the soil. By improving the permeability of the middle layer of the soil, the poor permeability of the new topsoil can be avoided, which would lead to reduced crop yields in subsequent crop cultivation.

[0217] The beneficial effect of step S170 is that by adjusting the position between the various soil layers, it can be ensured that the straw returned to the field can decompose over a longer period of time, while ensuring that the nutrients contained in the soil surface layer match the growth needs of the crops.

[0218] The beneficial effects of this application include:

[0219] 1. The decomposition time of straw returned to the field is extended. In the technical solution of this application, the straw returned to the field is buried in the bottom layer of the soil, and the bottom layer is adjusted to the middle layer in the following year, and it is adjusted to the top layer of the soil in the third year. Then it is actually used for planting corn or soybeans. The decomposition time of the straw returned to the field is no less than 2 years, which fully extends the decomposition time, effectively increases the quality of nutrients, and reduces greenhouse gas emissions.

[0220] 2. Achieving a reasonable arrangement of straw for returning to the field. In the technical solution of this application, corn straw and soybean straw are mixed. The nutrient content of these two types of straw is different. After mixing, it can effectively ensure that the straw returned to the field can provide all types of nutrients. The straw ratio is also designed to ensure a reasonable arrangement of straw for returning to the field.

[0221] 3. Achieves high decomposition of straw returned to the field. In the technical solution of this application, during the soil preparation of the bottom layer, the soil of the middle layer is also uniformly mixed in. The middle layer is essentially the bottom layer of soil laid in the previous year. After a year of decomposition, the content of microorganisms and decomposition promoters in the straw in it has been greatly increased. After mixing, it can play a good role in promoting the decomposition of straw in the new bottom layer of soil, thereby ensuring that the straw returned to the field is highly decomposed.

[0222] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to computer program instructions. The aforementioned computer program can be stored in a non-volatile storage medium, and when executed, it performs the steps of the above method embodiments. Alternatively, if the integrated unit of the present invention is implemented as a software functional module and sold or used as an independent product, it can also be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the embodiments of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a non-volatile storage medium and includes several instructions to cause an electronic device (which may be a personal computer, server, network device, etc.) to execute all or part of the methods described in the various embodiments of the present invention.

[0223] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A corn-soybean rotation planting method based on carbon sequestration and emission reduction, characterized in that, The method comprises the following steps: Based on the root depth of corn and soybean, the soil surface layer thickness of corn and soybean planting plots is obtained respectively; Based on the soil surface layer thickness of corn and soybean planting plots, the soil middle layer and the soil bottom layer of corn and soybean planting plots are obtained respectively; Based on the corn and soybean rotation cycle, the plot cultivation crop type at future time is obtained; Based on the plot cultivation crop type at future time, the corn and soybean straw returning amount ratio of the current plot is obtained, comprising: Based on the plot cultivation crop type at future time, the future soil surface layer nutrient demand amount corresponding to the plot cultivation crop type at the second future cultivation-harvest cycle is obtained; The amount of various nutrients generated by unit weight of corn and soybean straw returned to the field during the decomposition process is obtained; Based on the amount of various nutrients generated by unit weight of corn and soybean straw returned to the field during the decomposition process and the various nutrient demand amount, the corn and soybean straw returning amount ratio of the current plot is obtained; Based on the corn and soybean straw returning amount ratio of the current plot, corn and soybean straw is obtained, which is mixed with the soil surface layer soil to obtain straw mixed soil; Part of the soil in the soil middle layer of the current plot is separated and uniformly mixed with the straw mixed soil to obtain new bottom layer soil; The new bottom layer soil is buried in the position of the soil bottom layer of the current plot to obtain a new soil bottom layer, and the soil bottom layer of the current plot is adjusted to the new soil middle layer, and the soil middle layer of the current plot is adjusted to the new soil surface layer.

2. The method according to claim 1, wherein the method is characterized by, The method comprises the following steps: Based on the root depth of corn and soybean, the soil surface layer thickness of corn and soybean planting plots is obtained respectively; The corn and soybean varieties planted in the corn and soybean rotation area are obtained, and the root depth of the corn and soybean varieties is obtained; 3. The method according to claim 1, wherein the method is characterized by, The maximum root depth of the corn and soybean varieties is obtained, and the maximum root depth of the corn and soybean varieties is set as the soil surface layer thickness of the corn and soybean planting plot. The method comprises the following steps: The maximum soil plowing depth in the corn and soybean rotation area is obtained; The soil surface layer thickness of corn and soybean is removed from the maximum soil plowing depth to obtain a straw returning layer; 4. The method according to claim 1, wherein the method is characterized by, The straw returning layer is layered to obtain the soil middle layer and the soil bottom layer of the current corn and soybean planting plot. The method comprises the following steps: The corn and soybean rotation cycle is obtained, and the corn and soybean future cultivation plot in the future cultivation-harvest cycle is obtained; The correspondence between the cultivation-harvest cycle and the corn and soybean future cultivation plot is established to obtain the plot and crop correspondence; Based on the plot and crop correspondence, the cultivation crop type of all plots in the future time period is obtained.

5. The method according to claim 1, wherein the method is characterized by, The method comprises the following steps: obtaining the quality of each type of nutrient generated by the corn and soybean straw returned to field in unit weight during the decomposition process, and the demand of each type of nutrient, and obtaining the ratio of the corn and soybean straw returned to field in the current land, including: respectively obtaining the demand of each type of nutrient generated by the corn and soybean straw returned to field in unit weight in the current land, which is located in the bottom layer of soil and generated in one tillage-harvesting cycle, to obtain the quality of each type of nutrient generated by the corn and soybean straw returned to field in the bottom layer of soil during the decomposition process; respectively obtaining the demand of each type of nutrient generated by the corn and soybean straw returned to field in unit weight in the current land, which is located in the middle layer of soil and generated in one tillage-harvesting cycle, to obtain the quality of each type of nutrient generated by the corn and soybean straw returned to field in the middle layer of soil during the decomposition process; summing up the quality of each type of nutrient generated by the corn straw returned to field in the middle layer of soil and the quality of each type of nutrient generated by the corn straw returned to field in the bottom layer of soil respectively, and summing up the quality of each type of nutrient generated by the soybean straw returned to field in the middle layer of soil and the quality of each type of nutrient generated by the soybean straw returned to field in the bottom layer of soil respectively, to obtain the quality of each type of nutrient generated by the corn and soybean straw returned to field in the current land during the decomposition process; obtaining the ratio of the corn and soybean straw returned to field in the current land based on the demand of each type of nutrient in the future top layer of soil and the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process.

6. The corn-soybean rotation planting method based on carbon sequestration and emission reduction according to claim 5, characterized in that, The method comprises the following steps: obtaining the ratio of the corn and soybean straw returned to field in the current land based on the demand of each type of nutrient in the future top layer of soil and the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process, including: establishing an equation group based on the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process and the demand of each type of nutrient in the future top layer of soil; solving the equation group to obtain the ratio of the corn and soybean straw returned to field in the current land; obtaining all combinations of the corn and soybean straw returned to field according to the ratio of the corn and soybean straw returned to field, and obtaining the volume of the crushed and uniformly mixed corn and soybean straw combination; obtaining the ratio of the corn and soybean straw returned to field in the current land based on the demand of each type of nutrient in the future top layer of soil and the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process.

7. The method according to claim 1, wherein the method is characterized by, The method comprises the following steps: obtaining the ratio of the corn and soybean straw returned to field in the current land based on the demand of each type of nutrient in the future top layer of soil and the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process, including: respectively determining the weight of the corn and soybean straw returned to field based on the ratio of the corn and soybean straw returned to field in the current land; configuring the corn and soybean straw returned to field based on the weight of the corn and soybean straw returned to field, and crushing and uniformly mixing the corn and soybean straw returned to field to obtain mixed straw; uniformly mixing the top layer of soil in the current land and the mixed straw to obtain straw mixed soil.

8. The method according to claim 1, wherein the method is characterized by, The method comprises the following steps: obtaining the ratio of the corn and soybean straw returned to field in the current land based on the demand of each type of nutrient in the future top layer of soil and the quality of each type of nutrient generated by the corn and soybean straw returned to field in the decomposition process. determining a bottom region of a bottom layer of soil in the current plot of land, and separating the bottom layer of soil from the middle layer of soil in the current plot of land to obtain separated soil; uniformly mixing the separated soil and the straw mixed soil to obtain new bottom layer soil.

9. The method according to claim 1, wherein the method is characterized by, the step of burying the new bottom layer soil to a position of the bottom layer of soil in the current plot of land to obtain a new bottom layer of soil, the bottom layer of soil in the current plot of land being adjusted to a new middle layer of soil, and the middle layer of soil in the current plot of land being adjusted to a new top layer of soil, comprises: burying the new bottom layer soil to a position of the bottom layer of soil in the current plot of land to form a new bottom layer of soil; laying the bottom layer of soil in the current plot of land on the new bottom layer of soil, the bottom layer of soil in the current plot of land becoming a new middle layer of soil; laying the middle layer of soil in the current plot of land on the new middle layer of soil, the middle layer of soil in the current plot of land becoming a new top layer of soil.

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