Method for repairing acidified soil in cherry orchard based on intercropping of green manure plants

Abstract

The invention provides a method for repairing acidified soil in a cherry orchard based on intercropping of green manure plants, and belongs to the technical field of soil improvement. The method comprises the following steps: spreading a soil conditioner into the cherry orchard, sowing green manure plants among rows or plants of cherry trees, covering the cherry orchard with the green manure plants in a no-tillage manner after cutting, crushing the whole green manure plants in the next year, and then turning and pressing the green manure plants, the soil conditioner comprises biochar, a compound microbial agent, an organic fertilizer and a calcium magnesium phosphate fertilizer; the composite microbial inoculant comprises bacillus subtilis, bacillus amyloliquefaciens, pseudomonas aeruginosa and a microbial inoculant carrier. The method provided by the invention can significantly improve the nutrients of the cherry orchard soil, improve the soil structure, increase the pH value of the acidic soil, reduce the content of exchangeable acids, and play a role in improving the acidic soil of the cherry orchard.

Description

Technical Field

[0001] The present invention relates to the technical field of soil improvement, and in particular to a method for repairing acidified soil in a cherry orchard based on intercropping green manure plants. Background Art

[0002] Acidic soil is a general term for soil with low pH value, including red soil, yellow soil, brick red soil, red soil and gray soil. Acidic soil has high concentration of H + 、Al 3+ 、Mn 2+ and Fe 2+ Soil acidification can affect plant absorption and utilization of nutrients, mainly in the following aspects: 1. In acidic soils, due to the strong adsorption properties of aluminum ions, they can compete with exchangeable base ions for the negative charge on the colloid, causing the leaching of base ions such as calcium, magnesium, and potassium, and a decrease in base saturation; 2. Due to the increase in active iron and aluminum in acidic soils, phosphate ions can easily combine with them and form insoluble precipitates, reducing the effectiveness of phosphorus; 3. Bacteria and actinomycetes in the soil (such as nitrogen-fixing bacteria and cellulolytic bacteria) are suitable for growth and reproduction in neutral and slightly alkaline environments. Their activity gradually decreases in acidic soils, thereby affecting the decomposition of organic matter and soil fertility, while fungi dominate in strongly acidic soils, leading to serious plant diseases; 4. Due to the leaching of calcium, the soil aggregate structure and aggregates are reduced, resulting in the deterioration of soil physical properties and a decrease in water and fertilizer retention capacity; 5. Acidic soils reduce the effectiveness of soil nutrients, and the content of Al and other heavy metals is usually very high, which can also be toxic to plants. Therefore, it has become a limiting factor in the development of agricultural production.

[0003] Currently, the main methods for improving acidic soils include air pollution control, agricultural measures (such as crop rotation and intercropping), biological methods (biological acid removal), and chemical methods (amendments such as lime, industrial waste, and combined organic and inorganic fertilizers). While effective under certain conditions, these measures each have limitations: air pollution control cycles are long and costly, agricultural measures and biological methods are time-consuming and subject to climatic conditions, and chemical methods are labor-intensive and require large amounts of amendments. These methods are difficult to implement on a large scale and cannot meet the current needs for improving acidic soils in my country. While various amendments have some effect on acidic soils, lime is more effective. Lime has a good acid-reducing effect, but long-term lime application can lead to soil compaction and even re-acidification.

[0004] Cherry is a common fruit tree in my country, with an optimal pH of 6.0-7.0 for growth. However, the soil in cherry orchards is prone to acidity. This is primarily due to the combined effects of the cherry tree's physiological characteristics, management practices, and environmental factors: 1. During growth and nutrient absorption, cherry tree roots secrete organic acids (such as citric acid and malic acid) and hydrogen ions, which directly lower the pH of the rhizosphere soil. 2. Cherry trees typically absorb more cations (such as ammonium nitrogen, potassium ions, calcium ions, and magnesium ions) than anions (such as nitrate ions). To maintain charge balance within the plant, the roots release hydrogen ions into the soil in exchange for these cations, leading to soil acidification. 3. Cherry orchards often apply large amounts of nitrogen fertilizer to achieve high yields. Once applied, ammonium ions are absorbed by the plant or converted to nitrates through nitrification. However, the sandy or light loam soils commonly found in cherry orchards have weak buffering capacity, making acidification more likely to occur and manifest. Therefore, a method for remediating acidified soil in cherry orchards is crucial. Summary of the Invention

[0005] In view of this, the present invention provides a method for repairing acidified soil in a cherry orchard based on intercropping green manure plants, thereby solving the problem of soil acidification in cherry orchards.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for repairing acidified soil in a cherry orchard based on intercropping green manure plants, comprising the following steps:

[0008] A method for remediating acidified soil in a cherry orchard based on intercropping green manure plants comprises the following steps:

[0009] S1. From September to October, rotary till the acidic soil in the cherry orchard and dry it for 5 to 8 days;

[0010] S2. Apply soil conditioner to the soil and till the soil to mix the soil and soil conditioner;

[0011] S3. Apply basal fertilizer and irrigate until the soil moisture content reaches 50-60% of the soil water holding capacity;

[0012] S4. Sow green manure plants between rows or between cherry trees. Mow the trees when the grass layer reaches 40-50 cm in height and before flowering, leaving 7-10 cm of stubble. After mowing, cover the cherry orchard with the green manure plants. In March of the following year, crush the entire green manure plant to obtain a powder. Press the powder into the soil and irrigate regularly to maintain soil moisture at 60-70% of its water holding capacity for 20-30 days.

[0013] The soil conditioner comprises the following components by weight: 20-30 parts of biochar, 1-2 parts of composite microbial agent, 30-50 parts of organic fertilizer, and 10-20 parts of calcium magnesium phosphate fertilizer;

[0014] The composite bacterial agent comprises Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and a bacterial agent carrier.

[0015] Preferably, the depth of the rotary tillage is 20 to 30 cm.

[0016] Preferably, the mass ratio of the Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and the bacterial agent carrier is 0.8-1.2:1.4-1.6:0.8-1.2:4-5.

[0017] Preferably, the bacterial agent carrier is zeolite powder, diatomaceous earth, bentonite or peat; the effective viable bacteria count of the bacterial agent is 3 to 8×10 9 CFU / g.

[0018] Preferably, the green manure plants include at least one of Chinese milk vetch, vetch, rattail grass and arrow-tongue pea.

[0019] Preferably, the green manure plants are sown in rows or broadcasting, with a seed sowing rate of 3 to 4 kg per mu.

[0020] Preferably, the covering thickness of the green manure plants in S3 is 20 to 30 cm.

[0021] Preferably, the application amount of the soil conditioner is 180-220 kg / mu.

[0022] Preferably, the base fertilizer is a nitrogen, phosphorus and potassium compound fertilizer, and the amount of base fertilizer applied is 50 to 80 kg per mu.

[0023] Preferably, the length of the powder is 2 to 4 cm, and the amount of powder pressed is 0.8 to 1.2 t / mu.

[0024] By adopting the above technical solution, the present invention has the following beneficial effects: The method of the present invention comprises the following steps: spreading a soil conditioner in a cherry orchard, sowing green manure plants between rows or between cherry trees, mowing the green manure plants and covering them in the cherry orchard without tillage, and the following year crushing the green manure plants and turning them over. The soil conditioner comprises biochar, a composite microbial agent, organic fertilizer, and calcium magnesium phosphate fertilizer; the composite agent comprises Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa, and an agent carrier. The method of the present invention can significantly increase soil nutrients in the cherry orchard, improve soil structure, increase the pH value of acidic soil, and reduce the exchangeable acid content, thereby improving the acidic soil in the cherry orchard. DETAILED DESCRIPTION

[0025] The present invention provides a method for repairing acidified soil in a cherry orchard based on intercropping green manure plants, comprising the following steps:

[0026] S1. From September to October, rotary till the acidic soil in the cherry orchard and dry it for 5 to 8 days;

[0027] S2. Apply soil conditioner to the soil and till the soil to mix the soil and soil conditioner;

[0028] S3. Apply basal fertilizer and irrigate until the soil moisture content reaches 50-60% of the soil water holding capacity;

[0029] S4. Sow green manure plants between rows or between cherry trees. Mow the trees when the grass layer reaches 40-50 cm in height and before flowering, leaving 7-10 cm of stubble. After mowing, cover the cherry orchard with the green manure plants. In March of the following year, crush the entire green manure plant to obtain a powder. Press the powder into the soil and irrigate regularly to maintain soil moisture at 60-70% of its water holding capacity for 20-30 days.

[0030] The soil conditioner comprises the following components by weight: 20-30 parts of biochar, 1-2 parts of composite microbial agent, 30-50 parts of organic fertilizer, and 10-20 parts of calcium magnesium phosphate fertilizer;

[0031] The composite bacterial agent comprises Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and a bacterial agent carrier.

[0032] From September to October, the acidic soil in the cherry orchard is rotary tilled and air-dried. The tillage depth is 20 to 30 cm, preferably 23 to 27 cm, and more preferably 25 cm. The air-drying time is 5 to 8 days, preferably 6 to 7 days, in order to reduce the accumulation of reducing substances in the soil, inhibit pests and diseases, and promote microbial activity. A soil conditioner is then applied to the soil and plowed to mix the soil and soil conditioner. The soil conditioner comprises the following components by weight: 20-30 parts biochar, 1-2 parts composite microbial inoculant, 30-50 parts organic fertilizer, and 10-20 parts calcium magnesium phosphate fertilizer. In the soil conditioner of the present invention, the biochar is preferably present in an amount of 22-28 parts by weight, more preferably 25 parts by weight; the composite microbial inoculant is preferably present in an amount of 1.3-1.8 parts by weight, more preferably 1.5 parts by weight; the organic fertilizer is preferably present in an amount of 35-45 parts by weight, more preferably 40 parts by weight; and the calcium magnesium phosphate fertilizer is present in an amount of 12-18 parts by weight, more preferably 15 parts by weight. There are no particular limitations on the organic fertilizer and biochar described herein; they can be purchased or prepared using conventional methods in the art. The application rate of the soil conditioner is 180-220 kg / mu, preferably 190-210 kg / mu, and more preferably 200 kg / mu.

[0033] The composite microbial agent of the present invention comprises Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and an agent carrier; the mass ratio of the Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and the agent carrier is 0.8-1.2:1.4-1.6:0.8-1.2:4-5, preferably 1:1.5:1:4.5. The Bacillus subtilis is preferably purchased from the General Microorganism Center of the China Culture Collection Administration Committee, with the deposit number CGMCC No.11624. This strain has acid resistance and denitrification, and has a good repair effect on acidic soil; the Bacillus amyloliquefaciens is purchased from the General Microorganism Center of the China Culture Collection Administration Committee, with the deposit number GMCC NO.8230. This strain has multiple functions such as nitrogen fixation, phosphorus solubilization, potassium solubilization, disease prevention and growth promotion; the Pseudomonas aeruginosa is purchased from the General Microorganism Center of the China Culture Collection Administration Committee, with the deposit number CGMCCNO.28121. This strain has a high cellulose degradation rate and promotes the decomposition of green manure plant straw, that is, it promotes the decomposition of green manure returned to the field, improves the efficiency of returning green manure to the field, and also has the function of disease prevention and growth promotion. The above three strains have complementary functions and good synergy, and can effectively improve the acidic soil in the cherry orchard and improve soil fertility.

[0034] In the present invention, the bacterial agent carrier is zeolite powder, diatomaceous earth, bentonite or peat; the effective viable bacteria count of the bacterial agent is 3 to 8×10 9 CFU / g, preferably 4 to 7 × 10 9 CFU / g, more preferably 5×10 9 CFU / g.

[0035] After applying a soil conditioner and plowing the land, the present invention applies base fertilizer and irrigates the land until the soil moisture content reaches 50-60% of the soil water holding capacity. The base fertilizer is a nitrogen, phosphorus, and potassium compound fertilizer, and the amount of base fertilizer applied is 50-80 kg / mu, preferably 60-70 kg / mu, and more preferably 65 kg / mu. After fertilization, irrigation is performed until the soil moisture content reaches 50-60% of the soil water holding capacity, more preferably 52-58%, and more preferably 55%. Green manure plants are sown between the rows or between the cherry trees, and the green manure plants include at least one of Chinese milk vetch, vetch, rattail grass, and pea. The green manure plants are sown in rows or broadcast, with a seed sowing rate of 3-4 kg / mu, preferably 3.2-3.8 kg / mu, and more preferably 3.5 kg / mu; the first mowing is performed when the grass layer reaches a height of 40-50 cm and has not yet bloomed, leaving a stubble of 7-10 cm; after mowing, the green manure plants are covered in the cherry orchard; the thickness of the green manure plant covering is 20-30 cm, preferably 22-28 cm, and more preferably 25 cm. In March of the following year, the entire green manure plant is crushed to obtain a powder, the length of the powder being 2-4 cm, preferably 2.5-3.5 cm, and more preferably 3 cm; the powder is then pressed into the soil, with a pressing amount of 0.8-1.2 t / mu, preferably 0.9-1.1 t / mu, and more preferably 1 t / mu. Irrigate regularly to make the soil moisture content 60-70% of the soil water holding capacity, more preferably 63-68%, more preferably 65%; maintain it for 20-30 days, more preferably 22-27 days, more preferably 25 days.

[0036] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0037] The Bacillus subtilis in the examples of the present invention was purchased from the General Microorganism Center of China National Culture Collection Administration of Microorganisms with a deposit number of CGMCC No. 11624; the Bacillus amyloliquefaciens was purchased from the General Microorganism Center of China National Culture Collection Administration of Microorganisms with a deposit number of GMCC NO. 8230; and the Pseudomonas aeruginosa was purchased from the General Microorganism Center of China National Culture Collection Administration of Microorganisms with a deposit number of CGMCC NO. 28121.

[0038] The organic fertilizer in the embodiment of the present invention was purchased from Hebei Fengnong Organic Fertilizer Manufacturing Co., Ltd., the calcium magnesium phosphate fertilizer was purchased from Jinan Yuanmao Chemical Co., Ltd., and the biochar was purchased from Anhui Changxin Biomass Energy Co., Ltd.

[0039] Example 1

[0040] 20 kg of biochar, 1 kg of composite microbial agent, 30 kg of organic fertilizer, and 10 kg of calcium magnesium phosphate fertilizer were mixed evenly to obtain a soil conditioner. The composite microbial agent was prepared by mixing Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa, and diatomaceous earth in a mass ratio of 0.8:1.4:0.8:4, with an effective viable bacterial count of 4.5 × 10 9 CFU / g.

[0041] In early September, the acidic soil in the cherry orchard was rotary-tilled to a depth of 20 cm and aired for five days. A soil conditioner was then applied to the soil at a rate of 180 kg / mu and the soil was tilled to mix with the conditioner. A 15-15-15 nitrogen, phosphorus, and potassium compound fertilizer was applied to the cherry orchard at a rate of 80 kg / mu. Milk vetch was then sown in rows between the cherry trees at a rate of 3 kg / mu. The first mowing was performed when the grass layer reached 40-50 cm in height and before flowering, leaving a 7 cm stubble. After mowing, the stubble was mulched in the cherry orchard at a thickness of 20 cm. In March of the following year, the entire milk vetch plant was crushed into 2-4 cm long powder. This powder was then pressed into the soil at a rate of 0.8 t / mu. Regular irrigation was carried out to maintain soil moisture at 60% of the soil water holding capacity for 20 days.

[0042] Example 2

[0043] 25 kg of biochar, 1.5 kg of composite microbial agent, 40 kg of organic fertilizer, and 15 kg of calcium magnesium phosphate fertilizer were mixed evenly to obtain a soil conditioner. The composite microbial agent was prepared by mixing Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa, and bentonite in a mass ratio of 1:1.5:1:4.5, with an effective viable bacterial count of 5 × 10 9 CFU / g.

[0044] In mid-September, the acidic soil in the cherry orchard was rotary-tilled to a depth of 25 cm and aired for six days. Then, a soil conditioner was applied at a rate of 200 kg / mu and the soil was tilled to mix with the conditioner. A 15-15-15 nitrogen, phosphorus, and potassium compound fertilizer was applied at a rate of 65 kg / mu. Then, 3.5 kg / mu of glossy vetch seeds were broadcast between the cherry trees. The first mowing was performed when the grass layer reached a height of 40-50 cm and before flowering, leaving an 8 cm stubble. After mowing, the stubble was mulched in the cherry orchard to a depth of 25 cm. In March of the following year, the glossy vetch plants were crushed into 2-4 cm long powder. This powder was then pressed into the soil at a rate of 1 ton / mu. Regular irrigation was carried out to maintain the soil moisture content at 65% of the soil water holding capacity for 25 days.

[0045] Example 3

[0046] 30 kg of biochar, 2 kg of composite microbial agent, 50 kg of organic fertilizer, and 20 kg of calcium magnesium phosphate fertilizer were mixed evenly to obtain a soil conditioner. The composite microbial agent was prepared by Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa, and peat in a mass ratio of 1.2:1.6:1.2:5, and the effective viable bacteria count was 6 × 10 9 CFU / .

[0047] In early October, the acidic soil in the cherry orchard was rotary-tilled to a depth of 30 cm and aired for 8 days. A soil conditioner was then applied to the soil at a rate of 220 kg / mu and the soil was tilled to mix with the conditioner. A 15-15-15 nitrogen, phosphorus, and potassium compound fertilizer was applied to the cherry orchard at a rate of 50 kg / mu. Then, 4 kg / mu of sedge grass seeds were broadcast between the cherry trees. The first mowing was performed when the grass layer reached 40-50 cm in height and before flowering, leaving a 10 cm stubble. After mowing, the sedge grass was mulched in the cherry orchard to a thickness of 30 cm. In March of the following year, the entire sedge grass plant was crushed into 2-4 cm long powder. This powder was then pressed into the soil at a rate of 1.2 t / mu. Regular irrigation was carried out to maintain the soil moisture content at 70% of the soil water holding capacity for 30 days.

[0048] Comparative Example 1

[0049] Different from Example 2, no composite bacterial agent was added to the soil conditioner.

[0050] Comparative Example 2

[0051] The difference from Example 2 is that the composite bacterial agent does not contain Bacillus amyloliquefaciens and Pseudomonas aeruginosa, but is supplemented with an equal amount of Bacillus subtilis.

[0052] Comparative Example 3

[0053] The difference from Example 2 is that the composite bacterial agent does not contain Bacillus amyloliquefaciens and Bacillus subtilis, but is supplemented with an equal amount of Pseudomonas aeruginosa.

[0054] Comparative Example 4

[0055] The difference from Example 2 is that the composite bacterial agent does not contain Pseudomonas aeruginosa and Bacillus subtilis, but is supplemented with an equal amount of Bacillus amyloliquefaciens.

[0056] Comparative Example 5

[0057] The difference from Example 2 is that Aspergillus niger is used instead of Bacillus amyloliquefaciens. Aspergillus niger was purchased from the General Microbiology Center of the China Culture Collection Administration Committee with the deposit number CGMCC No. 22469. This strain has the ability to fix nitrogen, solubilize phosphorus and potassium and promote plant growth.

[0058] Comparative Example 6

[0059] The difference from Example 2 is that Vetch was not planted.

[0060] Experimental example

[0061] The experiment was conducted on September 10, 2023, in a cherry orchard at the Big Cherry Technology R&D Center base in Fushan District, Yantai City. The experiment was divided into 10 groups, and soil remediation was carried out according to the methods in Examples 1 to 3 and Comparative Examples 1 to 6, respectively. A cherry orchard without any treatment was used as a control. The area of each group was 1 mu. On March 22, 2024, the whole green manure plant was crushed and turned over. On October 8, 2024, soil samples were randomly selected from 5 points in each group to measure the content of soil organic matter, total nitrogen, available phosphorus, available potassium, as well as soil porosity, soil bulk density, soil pH and exchangeable acidity. The results are shown in Tables 1 and 2.

[0062] Table 1 Soil nutrient indexes of each group

[0063] Group Organic matter (g / kg) Total nitrogen (g / kg) Available phosphorus (mg / kg) Fast-acting potassium (mg / kg) Example 1 24.86 1.52 75.48 185.70 Example 2 25.33 1.57 81.32 192.26 Example 3 26.17 1.64 88.69 203.89 Comparative Example 1 20.85 1.30 63.75 156.03 Comparative Example 2 22.08 1.41 68.80 163.89 Comparative Example 3 21.39 1.35 65.23 158.17 Comparative Example 4 21.75 1.37 66.71 160.23 Comparative Example 5 22.91 1.44 70.55 168.32 Comparative Example 6 21.88 1.39 68.10 163.19 control group 18.63 1.21 56.52 140.28

[0064] As can be seen from Table 1, the contents of organic matter, total nitrogen, available phosphorus and available potassium in the cherry orchard soil in the embodiment of the present invention are significantly increased compared with the control group, indicating that the method of the present invention can improve soil nutrients, and its effect on improving soil fertility is better than that of using each strain alone, indicating that the strains can synergistically improve soil fertility.

[0065] Table 2 Structure, pH value and exchangeable acidity of soils in each group

[0066]

[0067]

[0068] As can be seen from Table 2, the soil porosity, soil bulk density, and pH value of the cherry orchard in the embodiment of the present invention are all significantly improved compared with the control group, indicating that the method of the present invention can effectively increase the pH value of acidic soil, reduce the exchangeable acid content, and play a role in improving the acidic soil in the cherry orchard.

[0069] It can be seen from the above embodiments that the present invention provides a method for repairing acidified soil in a cherry orchard based on intercropping green manure plants. The method of the present invention can effectively improve the acidic soil in a cherry orchard.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for repairing acidified soil in a cherry orchard based on intercropping green manure plants, characterized in that: The following steps are involved: S1. From September to October, rotary till the acidic soil in the cherry orchard and dry it for 5 to 8 days; S2. Apply soil conditioner to the soil and till the soil to mix the soil and soil conditioner; S3. Apply basal fertilizer and irrigate until the soil moisture content reaches 50-60% of the soil water holding capacity; S4. Sow green manure plants between rows or between cherry trees. Mow the trees when the grass layer reaches 40-50 cm in height and before flowering, leaving 7-10 cm of stubble. After mowing, cover the cherry orchard with the green manure plants. In March of the following year, crush the entire green manure plant to obtain a powder. Press the powder into the soil and irrigate regularly to maintain soil moisture at 60-70% of its water holding capacity for 20-30 days. The soil conditioner comprises the following components by weight: 20-30 parts of biochar, 1-2 parts of composite microbial agent, 30-50 parts of organic fertilizer, and 10-20 parts of calcium magnesium phosphate fertilizer; The composite bacterial agent comprises Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and a bacterial agent carrier.

2. The repair method according to claim 1, characterized in that: The depth of the rotary tillage is 20 to 30 cm.

3. The repair method according to claim 1, characterized in that: The mass ratio of the Bacillus subtilis, Bacillus amyloliquefaciens, Pseudomonas aeruginosa and the bacterial agent carrier is 0.8-1.2:1.4-1.6:0.8-1.2:4-5.

4. The repair method according to claim 3, characterized in that: The bacterial agent carrier is zeolite powder, diatomaceous earth, bentonite or peat; the effective viable bacteria count of the bacterial agent is 3 to 8×10 9 CFU / g.

5. The repair method according to claim 1, characterized in that: The green manure plants include at least one of Chinese milk vetch, vetch, rattail grass and arrow-tongue pea.

6. The repair method according to claim 1, characterized in that: The green manure plants are sown in row sowing or broadcast sowing, and the sowing amount of seeds is 3-4 kg / mu.

7. The repair method according to claim 1, characterized in that: The covering thickness of the green manure plants in S3 is 20 to 30 cm.

8. The repair method according to claim 1, characterized in that: The application amount of the soil conditioner is 180-220 kg / mu.

9. The repair method according to claim 1, characterized in that: The base fertilizer is a nitrogen, phosphorus and potassium compound fertilizer, and the application amount of the base fertilizer is 50 to 80 kg / mu.

10. The repair method according to claim 1, characterized in that: The length of the powder is 2 to 4 cm, and the turning amount of the powder is 0.8 to 1.2 t / mu.

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