A method for filling in the fallow period of Changwu Huai Bean

Abstract

This invention discloses a method for filling the fallow land with Changwu Huai beans, belonging to the field of planting technology. The method includes the following steps: (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai bean seeds that are free from pests and damage, and sow them by row sowing; (2) Root management: After the Changwu Huai beans emerge, the lateral roots are cut off 15-20 days later, and secretion-promoting granules are applied to the soil surface after the root cutting treatment, and then the secretion-promoting granules are plowed into the soil; (3) Post-planting management: Watering and pest and disease management are carried out on the Changwu Huai beans. Harvest or return to the field 3 months after planting, which solves the problem of harmful carboxylic acid accumulation caused by promoting the secretion of Changwu Huai beans roots.

Description

Technical Field

[0001] This invention relates to the field of fallow planting technology, and in particular to a fallow planting method for Changwu Huai beans. Background Technology

[0002] Continuous cropping can lead to crop rotation problems, deteriorating soil conditions, such as soil salinization, reduced fertility, and severe soil compaction. This increases the difficulty of crop cultivation, resulting in slow growth, reduced yields, and lower economic value of agricultural products. To mitigate the negative impacts of continuous cropping on the soil, fallow crops can be planted during the intervals between existing crops. These fallow crops can be harvested for animal feed or returned to the field. Compared to traditional bare land fallowing, introducing fallow crops offers multiple ecological benefits, including improving soil structure, promoting nutrient cycling, enhancing soil fertility and microbial activity, controlling soil erosion, and suppressing weed growth and pests.

[0003] Changwu Huaidou ， As a legume green manure, Changwu Huai soybean is rich in protein, vitamins, minerals, and other nutrients, giving it high economic value. It can be used as a fallow crop, planted during the gaps in existing crop planting, effectively improving soil properties and fertility. However, it typically requires returning Changwu Huai soybean to the field to effectively improve soil properties; its effect during the planting period is relatively small, and the improvement process takes a long time. Therefore, soil properties can be improved by promoting root secretions. This is because root secretions contain proteins, amino acids, and sugars that effectively promote plant growth and also promote the cycling and accumulation of organic carbon in the soil, increasing soil fertility and thus improving soil physical properties. However, with the release of root secretions, harmful carboxylic acids also gradually accumulate, inhibiting crop growth and potentially affecting the growth and yield of the next crop. Applying quicklime can remove harmful carboxylic acids from the soil, but excessive application of quicklime can negatively impact the soil's physical and chemical properties and hinder normal plant growth, resulting in poor treatment effects.

[0004] Therefore, this invention provides a method for filling fallow land with Changwu Huai beans, which promotes the release of root exudates of Changwu Huai beans while reducing the accumulation of harmful carboxylic acids, thereby improving the soil improvement effect of filling fallow land with Changwu Huai beans. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a method for filling in the fallow areas of Changwu Huai Bean, which solves the problem of harmful carboxylic acid accumulation caused by promoting root secretion of Changwu Huai Bean.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai bean seeds that are free from pests and damage, and sow them in rows with a plant spacing of 40-45cm and a row spacing of 10-12cm. The sowing amount is 4-5kg / mu.

[0008] (2) Root management: After the Changwu Huai Dou seedlings emerge, the lateral roots are cut off 15-20 days later. After the root cutting, secretion-promoting granules are applied to the soil surface and the soil is tilled again to mix the secretion-promoting granules evenly with the soil.

[0009] (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting.

[0010] Furthermore, the root cutting operation in step (2) is as follows: use a shovel to cut the lateral roots, and the number of lateral roots cut off shall not exceed 50% of the total number of lateral roots.

[0011] Damaging the roots of Changwu Huai Dou can effectively stimulate root regeneration, accelerate cell division at the wound site, and effectively promote the growth of lateral roots, thereby increasing the effective area of ​​root secretion and promoting the release of root secretions.

[0012] Furthermore, the amount of the secretion-promoting granules used is: per 1m 2 Use 15-20g of secretion-promoting granules in the soil.

[0013] Furthermore, the method for preparing the secretion-stimulating granules is as follows:

[0014] S1: Mix magnesium chloride and sodium silicate evenly and add them to water. Stir and react at 60-65℃ for 2-3 hours. Let it stand and cool to room temperature. Add sodium carbonate, stir and let it stand for another 3-5 hours. Filter, dry and pulverize to obtain the complex insoluble substance.

[0015] S2: Add polyglutamic acid to water and stir until homogeneous to obtain a polyglutamic acid solution. Then add sodium sulfite and arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add the composite insoluble substance. Stir until homogeneous to obtain a composite gel.

[0016] S3: Add the complex insoluble substance to the complex gel, dry it at 30-35℃ for 2-3 hours, and then pulverize it to obtain secretion-promoting granules.

[0017] Furthermore, in the preparation method S1 of the secretion-promoting granules, the particle size of the complex insoluble material is 0.1-0.2 mm.

[0018] Furthermore, in the preparation method S1 of the secretion-promoting granules, the mass ratio of magnesium chloride, sodium silicate, and sodium carbonate is (3-3.5):(4-5):(2-2.2).

[0019] Furthermore, in the preparation method S3 of the secretion-promoting granules, the mass ratio of polyglutamic acid, sodium sulfite, arginine, polyvinyl alcohol, and the complex insoluble substance is (1.2-1.5):(1-1.2):(0.8-1.2):(3-4):(4-5).

[0020] Furthermore, in the preparation method S3 of the secretion-promoting granules, the particle size of the secretion-promoting granules is 0.2-0.5 cm.

[0021] Adding exudate-promoting granules to the soil can effectively increase root exudates, thereby enhancing the activity of soil microorganisms and improving the soil's physical and chemical properties. The addition of polyglutamic acid to these granules promotes the division and growth of plant root cells, thus promoting root growth and development, effectively increasing root area, and allowing more exudates to be released from the roots. Simultaneously, the added sodium sulfite effectively enhances root vitality, maintaining root cells at a high level of activity, promoting the release of exudates from root cells, and increasing the exudate secretion rate. The addition of arginine to the composite gel further enhances root vitality and promotes the release of root exudates.

[0022] Increased root exudate release raises soil organic matter content and fertility. However, phenolic acids such as p-hydroxybenzoic acid, ferulic acid, coumaric acid, and syringic acid accumulate in the soil, inhibiting plant growth and potentially affecting subsequent crop growth if not addressed promptly. Therefore, this invention utilizes exudate-promoting granules to effectively adsorb free ferulic acid, coumaric acid, and other harmful carboxylic acids in the soil. These granules then react with sodium carbonate to remove the harmful carboxylic acids. However, direct addition of sodium carbonate to the soil increases pH, altering its physicochemical properties and leading to excessive absorption by *Phyllostachys edulis* roots, which inhibits plant growth. Therefore, this invention employs a polyvinyl alcohol (PVA) composite gel to encapsulate the sodium carbonate-containing insoluble compound, preventing leakage. Furthermore, sodium carbonate promotes PVA gel formation and enhances its stability, preventing the exudate-promoting granules from decomposing too quickly and exposing the internal insoluble compound, which could lead to sodium carbonate entering the soil and negatively impacting plants. In addition, if the loading efficiency of sodium carbonate directly loaded onto the precipitate is low, sodium carbonate is added when magnesium silicate precipitate formed by the reaction of magnesium chloride and sodium silicate crystallizes, so that they are mixed and crystallized, and sodium carbonate is directly loaded into the magnesium silicate crystals to obtain a complex insoluble substance.

[0023] Beneficial effects:

[0024] This invention involves pruning the lateral roots of *Changwu Huai Dou* (a type of soybean) and then treating them in conjunction with secretion-promoting granules. This promotes root secretion, thereby improving soil fertility and properties. The improved soil exhibits better physical properties, resulting in better crop growth and increased yields. Therefore, this invention can significantly promote agricultural development and increase agricultural profits. Furthermore, the secretion-promoting granules are biodegradable in the soil and do not pollute the environment. This method is simple, easy to operate, and worthy of widespread application. Detailed Implementation

[0025] The present invention will be described in detail below with reference to specific embodiments:

[0026] Example 1: A method for filling in the fallow land with Changwu Huai Beans

[0027] Preparation of secretion-stimulating granules:

[0028] S1: Mix 3g magnesium chloride and 4g sodium silicate evenly and add them to 120ml of water. Stir and react at 60℃ for 2 hours. Let stand and cool to room temperature. Add 2g sodium carbonate, stir evenly and let stand for 3 hours. Filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0029] S2: Add 1.2g of polyglutamic acid to 100ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1g of sodium sulfite and 0.8g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 3g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 4g of the composite insoluble substance. Stir until homogeneous to obtain a composite gel.

[0030] S3: Dry the composite gel at 30°C for 2 hours, and then pulverize it to obtain secretion-promoting particles of about 0.2 cm.

[0031] Changwu Huai Bean Filling-in-the-Leave Planting:

[0032] (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai bean seeds that are free from pests and damage, and sow them in rows with a plant spacing of 40cm and a row spacing of 10cm. The sowing amount is 5kg / mu.

[0033] (2) Root management: 15 days after the emergence of Changwu Huai soybean seedlings, use a shovel to cut the lateral roots, removing 50% of the total number of lateral roots. Then, plow the soil with the secretion-promoting granules, and plow again to mix the granules evenly with the soil. The amount of secretion-promoting granules used each time is per 1m³. 2 Use 15g of secretion-promoting granules;

[0034] (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting.

[0035] Example 2: Method Two for Filling the Loose Planting Area of ​​Changwu Huai Beans

[0036] Preparation of secretion-stimulating granules:

[0037] S1: Mix 3.2g magnesium chloride and 4.5g sodium silicate evenly and add them to 128ml of water. Stir and react at 62℃ for 2.2h. Let stand and cool to room temperature, add 2.1g sodium carbonate, stir and let stand for another 4h. Filter, dry and pulverize to obtain a complex insoluble substance of about 0.15mm.

[0038] S2: Add 1.35g of polyglutamic acid to 116ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1.1g of sodium sulfite and 1g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 3.5g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 4.5g of the composite insoluble substance. Stir until homogeneous to obtain a composite gel.

[0039] S3: Dry the composite gel at 32°C for 2.5 hours, and then pulverize it to obtain secretion-promoting particles of about 0.3 cm.

[0040] Changwu Huai Bean Filling-in-the-Leave Planting:

[0041] (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai bean seeds that are free from pests and damage, and sow them in rows with a plant spacing of 42cm and a row spacing of 11cm. The sowing amount is 4.5kg / mu.

[0042] (2) Root management: 18 days after the emergence of Changwu Huai soybean seedlings, use a shovel to cut the lateral roots, removing 50% of the total number of lateral roots. Then, plow the soil with the secretion-promoting granules, and plow again to mix the granules evenly with the soil. The amount of secretion-promoting granules used each time is per 1m³. 2 Use 15g of secretion-promoting granules;

[0043] (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting.

[0044] Example 3: Method Three for Filling the Loose Planting Area of ​​Changwu Huai Beans

[0045] Preparation of secretion-stimulating granules:

[0046] S1: Mix 3.5g magnesium chloride and 5g sodium silicate evenly and add them to 140ml of water. Stir and react at 65℃ for 2.5h. Let stand and cool to room temperature, add 2.2g sodium carbonate, stir and let stand for another 5h. Filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0047] S2: Add 1.5g of polyglutamic acid to 133ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1.2g of sodium sulfite and 1.2g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 4g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 5g of the composite insoluble substance. Stir until homogeneous to obtain a composite gel.

[0048] S3: Dry the composite gel at 35°C for 3 hours, and then pulverize it to obtain secretion-promoting particles of about 0.5 cm.

[0049] Changwu Huai Bean Filling-in-the-Leave Planting:

[0050] (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai beans that are free from pests and damage, and sow them in rows with a plant spacing of 42cm and a row spacing of 12cm. The sowing amount is 4kg / mu.

[0051] (2) Root management: 20 days after the emergence of Changwu Huai soybean seedlings, use a shovel to cut the lateral roots, removing no more than 50% of the total number of lateral roots. Then, plow the soil with the secretion-promoting granules, and plow again to mix the granules evenly with the soil. The amount of secretion-promoting granules used each time is per 1m³. 2 Use 15g of secretion-promoting granules;

[0052] (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting.

[0053] Comparative Example 1:

[0054] This comparative example is compared with Example 1, the only difference being that sodium sulfite, polyglutamic acid, and arginine are not added during the preparation of the secretion-promoting granules. The specific method is as follows:

[0055] S1: Mix 3g magnesium chloride and 4g sodium silicate evenly and add them to 120ml of water. Stir and react at 60℃ for 2 hours. Let stand and cool to room temperature. Add 2g sodium carbonate, stir evenly and let stand for 3 hours. Filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0056] S2: Add 3g of polyvinyl alcohol to 100ml of water, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 4g of the composite insoluble substance. Stir evenly to obtain the composite gel.

[0057] S3: Dry the composite gel at 30°C for 2 hours, and then pulverize it to obtain secretion-promoting particles of about 0.2 cm.

[0058] The method for filling in the fallow land with Changwu Huai beans in this comparative example is the same as that in Example 1.

[0059] Comparative Example 2:

[0060] This comparative example is compared with Example 1, the only difference being that sodium carbonate is not added during the preparation of the secretion-promoting granules. The specific method is as follows:

[0061] S1: Mix 3g magnesium chloride and 4g sodium silicate evenly and add them to 120ml of water. Stir and react at 60℃ for 2 hours, let stand and cool to room temperature, let stand for 3 hours, filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0062] S2: Add 1.2g of polyglutamic acid to 100ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1g of sodium sulfite and 0.8g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 3g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 4g of the composite insoluble substance. Stir until homogeneous to obtain a composite gel.

[0063] S3: Dry the composite gel at 30°C for 2 hours, and then pulverize it to obtain secretion-promoting particles of about 0.2 cm.

[0064] The method for filling in the fallow land with Changwu Huai beans in this comparative example is the same as that in Example 1.

[0065] Comparative Example 3:

[0066] This comparative example is compared with Example 1, the only difference being that sodium carbonate is not loaded into the complex insoluble material during the preparation of the secretion-promoting granules, but is instead prepared by soaking, as detailed below:

[0067] S1: Mix 3g magnesium chloride and 4g sodium silicate evenly and add them to 120ml of water. Stir and react at 60℃ for 2 hours. Let stand and cool to room temperature. Stir evenly and let stand for 3 hours. Filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0068] S2: Add 2g of sodium carbonate to 120ml of solution and stir until homogeneous to obtain sodium carbonate solution. Then add the complex sparingly soluble substance to the sodium carbonate solution and soak for 3h. After filtration and drying, obtain the complex sparingly soluble substance of sodium carbonate loaded with sodium carbonate.

[0069] S3: Add 1.2g of polyglutamic acid to 100ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1g of sodium sulfite and 0.8g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 3g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add 4g of the composite insoluble substance of sodium carbonate loaded with sodium carbonate. Stir until homogeneous to obtain a composite gel.

[0070] S4: Dry the composite gel at 30°C for 2 hours, and then pulverize it to obtain secretion-promoting particles of about 0.2 cm.

[0071] Comparative Example 4:

[0072] This comparative example is compared with Example 1, the only difference being that no complex poorly soluble substance was added during the preparation of the secretion-promoting granules. The specific method is as follows:

[0073] S1: Add 1.2g of polyglutamic acid to 100ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1g of sodium sulfite and 0.8g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 3g of polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, and stir until homogeneous to obtain a composite gel.

[0074] S2: Dry the composite gel at 30°C for 2 hours, and then pulverize it to obtain secretion-promoting particles of about 0.2 cm.

[0075] The method for filling in the fallow land with Changwu Huai beans in this comparative example is the same as that in Example 1.

[0076] Comparative Example 5:

[0077] This comparative example is compared with Example 1, the only difference being that the secretion-stimulating particles are not prepared into a gel state. The specific method is as follows:

[0078] S1: Mix 3g magnesium chloride and 4g sodium silicate evenly and add them to 120ml of water. Stir and react at 60℃ for 1.5h. Let stand and cool to room temperature, add 2g sodium carbonate, stir evenly and let stand for 15min, filter, dry and pulverize to obtain a complex insoluble substance of about 0.1mm.

[0079] S2: Add 1.2g of polyglutamic acid to 100ml of water and stir until homogeneous to obtain a polyglutamic acid solution. Then add 1g of sodium sulfite and 0.8g of arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add 4g of the complex insoluble substance to the mixed solution and soak for 1h. After filtration, dry at 30℃ for 2h to obtain secretion-promoting granules.

[0080] experiment:

[0081] (1) Sowing: Idle fields after wheat harvest were selected as experimental fields and divided into 9 independent experimental fields, each with an area of ​​50m². 2 The soil conditions in each experimental field are the same. After the land is deeply plowed with a deep plowing machine, Changwu Huai soybean seeds that are free from pests and damage are selected and sown in rows with a plant spacing of 40cm and a row spacing of 10cm. The sowing rate is 5kg / mu.

[0082] (2) Root management: 15 days after the emergence of Changwu Huai soybean seedlings, use a shovel to cut the lateral roots, removing 50% of the total number of lateral roots. Then, plow the soil with the secretion-promoting granules, and plow again to mix the granules evenly with the soil. The amount of secretion-promoting granules used each time is per 1m³. 2 Use 15g of secretion-promoting granules;

[0083] (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting.

[0084] Based on the above method, the following experiment was conducted:

[0085] 1. Experimental group 1 used the secretion-promoting granules prepared in Example 1;

[0086] 2. Control groups 1-5 used the secretion-promoting granules prepared in comparative examples 1-5;

[0087] 3. Control group 6 did not use secretion-stimulating granules. The specific steps (2) are as follows:

[0088] (2) Root management: 15 days after the emergence of Changwu Huai Dou seedlings, use a shovel to cut the lateral roots. The number of lateral roots cut off is 50% of the total number of lateral roots.

[0089] 4. Control group 7 did not undergo root cutting treatment. The specific steps (2) are as follows:

[0090] (2) Root management: 15 days after the emergence of Changwu Huai soybean seedlings, plow the secretion-promoting granules into the soil, and plow the soil again to mix the secretion-promoting granules evenly with the soil. The amount of secretion-promoting granules used each time is per 1m³. 2 Use 15g of secretion-promoting granules;

[0091] 5. Control group 8 did not use secretion-promoting granules, nor did it undergo root cutting.

[0092] Before sowing, the contents of soil organic carbon, microbial biomass carbon, and harmful carboxylic acids (p-hydroxybenzoic acid and ferulic acid) in the 0-10cm soil layer of the experimental field were measured. Among them, organic carbon = 10.67g / kg, microbial biomass carbon = 68.2mg / kg, ferulic acid = 5.42mg / kg, and p-hydroxybenzoic acid = 8.85mg / kg.

[0093] Two months after sowing, 50 Changwu Huai soybean plants were randomly selected, and their plant height was measured. Soil organic carbon and harmful carboxylic acids (p-hydroxybenzoic acid and ferulic acid) were also tested again. The results are shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] Analysis of Table 1 yields the following results:

[0098] 1. Compared with experimental group 1, control group 1 did not add sodium sulfite, polyglutamic acid, or arginine during the preparation of the exudate-promoting granules. This resulted in a lower root growth rate, a smaller exudate secretion area, and a lower exudate rate. Since the release of root exudates can increase the activity of soil microorganisms, thereby increasing microbial biomass carbon and organic carbon content, the lower microbial biomass carbon and organic carbon content in control group 1 further affected crop growth, leading to a lower plant height for Changwu Huai soybeans in control group 1.

[0099] 2. Compared to experimental group 1, control group 2 did not add sodium carbonate during the preparation of the secretion-promoting granules. The decomposition rate of the secretion-promoting granules was faster, and they were unable to remove organic acids. Therefore, control group 2 had a reduced effect on organic acid treatment, resulting in affected crop growth and lower plant height. Compared to experimental group 1, control group 3 did not load sodium carbonate onto the complex insoluble material; instead, it used an immersion method to adsorb sodium carbonate. The loading rate of sodium carbonate on the complex insoluble material was lower, resulting in a lower adsorbed sodium carbonate content and a reduced treatment rate for harmful carboxylic acids, leading to a higher content of harmful carboxylic acids in the soil.

[0100] 3. Compared with experimental group 1, no compound insoluble substances were added during the preparation of secretion-promoting granules in control group 4. The harmful carboxylic acids released by the roots could be adsorbed by the compound gel. However, after the compound gel decomposed, it could no longer treat the harmful carboxylic acids in the soil, resulting in lower levels of ferulic acid and p-hydroxybenzoic acid in control group 4, which affected crop growth. Therefore, the plant height of Changwu Huai Bean was lower.

[0101] 4. Compared with experimental group 1, control group 5 did not prepare the secretion-promoting particles into a gel state. The sodium carbonate in the secretion-promoting particles would directly enter the soil, affecting the soil pH and being directly absorbed by the crops, thus inhibiting crop growth and reducing plant height.

[0102] 5. Compared to experimental group 1, control group 6, without the use of secretion-promoting granules, had a slower rate of root exudate release. However, due to root damage, the release of root exudates was increased, and the harmful carboxylic acids released from the roots could not be effectively treated, resulting in higher levels of ferulic acid and p-hydroxybenzoic acid in the soil, further affecting plant growth. Compared to experimental group 1, control group 7, without root damage, released less root exudate. This is because root damage effectively stimulates root growth and promotes root exudation. Therefore, control group 7, without root damage, had lower organic carbon content and soil microbial biomass carbon. Simultaneously, the reduced root exudates also lowered the content of harmful carboxylic acids in the soil. Compared to experimental group 1, control group 8, without lateral root removal or the addition of secretion-promoting granules, showed slower root growth and lower vitality in *Sophora flavescens*, resulting in less root exudate release, lower organic carbon content, and lower soil microbial biomass carbon.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A method for filling in the fallow period of Changwu Huai soybean, characterized in that, The method includes the following steps: (1) Sowing: After deep plowing the land with a deep plowing machine, select Changwu Huai beans that are free from pests and damage, and sow them by row sowing. (2) Root management: After the Changwu Huai Dou seedlings emerge, the lateral roots are cut off 15-20 days later. After the root cutting, secretion-promoting granules are applied to the soil surface and then the secretion-promoting granules are tilled into the soil. (3) Post-planting management: Watering and pest and disease management of Changwu Huai beans. Harvest or return to the field 3 months after planting. The method for preparing the secretion-stimulating granules is as follows: S1: Mix magnesium chloride and sodium silicate evenly and add them to water. Stir and react at 60-65℃ for 2-3 hours. Let it stand and cool to room temperature. Add sodium carbonate, stir and let it stand for another 3-5 hours. Filter, dry and pulverize to obtain the complex insoluble substance. S2: Add polyglutamic acid to water and stir until homogeneous to obtain a polyglutamic acid solution. Then add sodium sulfite and arginine to the polyglutamic acid solution and stir until homogeneous to obtain a mixed solution. Then add polyvinyl alcohol to the mixed solution, heat and stir until the polyvinyl alcohol dissolves, then cool to room temperature and add the composite insoluble substance. Stir until homogeneous to obtain a composite gel. S3: Add the complex insoluble substance to the complex gel, dry it at 30-35℃ for 2-3 hours, and then pulverize it to obtain secretion-promoting granules.

2. The method for filling in the fallow land with Changwu Huai soybeans according to claim 1, characterized in that, The root cutting operation in step (2) is as follows: use a shovel to cut the lateral roots, and the number of lateral roots cut off shall not exceed 50% of the total number of lateral roots.

3. A method for filling in fallow areas with Changwu Huai beans according to claim 2, characterized in that, The dosage of the secretion-stimulating granules is: per 1m 2 Use 15-20g of secretion-promoting granules in the soil.

4. A method for filling in fallow areas with Changwu Huai beans according to claim 3, characterized in that, In the preparation method S1 of the secretion-promoting granules, the particle size of the complex insoluble material is 0.1-0.2 mm.

5. A method for filling in fallow areas with Changwu Huai soybeans according to claim 4, characterized in that, In the preparation method S1 of the secretion-promoting granules, the mass ratio of magnesium chloride, sodium silicate, and sodium carbonate is (3-3.5):(4-5):(2-2.2).

6. A method for filling in fallow areas with Changwu Huai soybeans according to claim 5, characterized in that, In the preparation method S3 of the secretion-promoting granules, the mass ratio of polyglutamic acid, sodium sulfite, arginine, polyvinyl alcohol, and the complex insoluble substance is (1.2-1.5):(1-1.2):(0.8-1.2):(3-4):(4-5).

7. A method for filling in fallow areas with Changwu Huai soybeans according to claim 6, characterized in that, In the preparation method S3 of the secretion-promoting granules, the particle size of the secretion-promoting granules is 0.2-0.5 cm.

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