Method for ecological restoration of acidified tobacco field soil

Abstract

The application relates to the field of agricultural technology and discloses an acidified tobacco field soil ecological restoration method, which comprises the following steps: firing tobacco residues and rice husks into wood ash, and applying the wood ash and a solid microbial agent to acidified tobacco field soil; planting leguminous plants and onions in the acidified soil; during the growth stage of the leguminous plants, picking the fruiting parts of the leguminous plants to obtain leguminous plant fruits and leguminous plant residues; turning the onions and the leguminous plant residues into green manure and pressing them into the acidified soil; processing the leguminous plant fruits into organic fertilizer, applying the organic fertilizer to the acidified soil, and completing the restoration of the acidification of the soil; the soil acidification restoration method provided by the application combines different measures to form a multi-level restoration strategy, improves the physical, chemical and biological properties of the soil from different angles, and effectively completes the restoration of the soil acidification.

Description

Technical Field

[0001] This invention relates to the field of agricultural technology, and in particular to a method for ecological restoration of acidified tobacco field soil. Background Technology

[0002] Continuous cropping of flue-cured tobacco over a long period leads to soil acidification in tobacco fields, resulting in decreased soil organic matter, increased harmful microorganisms, and exacerbated diseases. Soil acidification in tobacco fields refers to the process of excessive accumulation of acidic substances in the soil, leading to a decrease in soil pH. Because an acidic environment affects the availability of nutrients in the soil and adversely impacts tobacco roots and soil microorganisms, soil acidification in tobacco fields has a series of negative impacts on tobacco production and the agro-economy, including reduced nutrient availability, hindered tobacco root growth, impaired soil microbial activity, and increased tobacco diseases. Therefore, appropriate measures are needed to remediate acidified tobacco field soils.

[0003] Some existing methods for remediating acidified soils may have negative impacts on soil ecosystems. For example, overuse of chemicals or excessive application of certain remediation materials may damage soil microorganisms and other soil organisms. Some remediation methods may require regular maintenance or reapplication, otherwise soil acidity may increase again, leading to sustainability issues.

[0004] Therefore, in response to the problem of increasingly severe soil acidification caused by long-term continuous cropping of tobacco fields, there is an urgent need for a sustainable method for ecological restoration of acidified tobacco fields that will not harm the soil organisms, in order to maintain good soil health and sustainable development of tobacco production. Summary of the Invention

[0005] In view of this, the present invention proposes a method for ecological restoration of acidified tobacco field soil, comprising:

[0006] Tobacco residues and rice husks are burned into wood ash;

[0007] In the acidified tobacco fields where flue-cured tobacco was planted that year, wood ash and solid microbial agents were spread to neutralize the soil acidity, increase the pH value of the tobacco field soil, and the soil was plowed and ridged.

[0008] In the second year, legumes and onions were planted in the acidified soil;

[0009] During the growth stage of the legume, the fruit of the legume is harvested to obtain the legume fruit and the remaining legume plant.

[0010] The onions and the remaining legume plants are incorporated into the acidified soil as green manure;

[0011] The fruits of the legume plants are processed into organic fertilizer, which is then applied to the acidified soil to restore the soil acidification.

[0012] A preferred method for ecological restoration of acidified tobacco field soil includes:

[0013] Step 1: Burn tobacco residue and rice husks into wood ash;

[0014] Step 2 involves spreading wood ash and solid microbial agents in the acidified tobacco field soil where flue-cured tobacco was planted that year to neutralize the soil acidity, increase the pH value of the tobacco field soil, and then plowing and ridging the soil.

[0015] Step 3: Plant peanuts and onions in the second year;

[0016] Step 4: During the mature harvesting stage of peanuts and onions, harvest peanut pods and onion bulbs, and turn over the remaining plant residues as green manure into the acidified tobacco field soil to improve soil organic matter.

[0017] Step 5: When the peanut and onion plant residues are turned into the acidified soil as green manure, wood ash and solid microbial agents are also turned into the acidified soil at the same time to neutralize the soil acidity and increase the pH value of the tobacco field soil.

[0018] Step 6: The peanut pods are processed into biochar organic fertilizer, which is then applied as a base fertilizer to the acidified tobacco field soil during tobacco planting.

[0019] The above six steps complete the remediation of soil acidification in the tobacco fields.

[0020] Preferably, the tobacco residue is tobacco straw.

[0021] Preferably, the wood ash is made by burning a mixture of tobacco straw and rice husks.

[0022] Preferably, the application rate of the wood ash is 1000-1500 kg / hm². 2 .

[0023] Preferably, the solid microbial agent is an actinomycete agent, and the addition amount of the solid microbial agent is 45-60 kg / hm. 2 .

[0024] Preferably, after applying wood ash and solid microbial inoculants, the soil is tilled and ridged to a depth of 15-20cm.

[0025] Preferably, the time for plowing and ridging is in autumn and winter, with a ridge spacing of 60-80cm and a ridge height of 30-35cm.

[0026] Preferably, peanuts and onions are intercropped, with onions planted between two peanut plants.

[0027] Preferably, peanuts are sown with a row spacing of 60-80cm and a plant spacing of 25-30cm, with one row per ridge; onions are transplanted 1-1.5 months after peanut sowing, with onions planted between two peanut plants, with two rows per ridge.

[0028] Preferably, the harvested peanuts and onions contain plant residues mainly including peanut vines, peanut roots, onion stems, onion leaves, and onion roots.

[0029] Preferably, the wood ash, the solid microbial agent, and the plant residues of peanuts and onions are compacted into the acidified soil to a depth of 15-20 cm.

[0030] Preferably, the method for preparing the organic fertilizer is as follows: the peanut pods are made into biochar; calcium phosphate, zeolite powder, bone meal and the biochar are mixed to obtain a mixed powder, and polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain the biochar organic fertilizer.

[0031] Preferably, the method for preparing the biochar includes: drying the peanut pods to obtain dried pods, pulverizing the dried pods, and then coking them under anaerobic conditions to obtain the biochar.

[0032] Preferably, when the biochar organic fertilizer is applied as a base fertilizer to the acidified tobacco field soil during flue-cured tobacco planting, it includes: applying the biochar organic fertilizer to the acidified soil during ridging before transplanting the flue-cured tobacco, then ridging according to the required ridging specifications for flue-cured tobacco planting, and transplanting the tobacco seedlings.

[0033] More preferably, the application rate of the biochar organic fertilizer is 750-1200 kg / hm². 2 .

[0034] Compared with existing technologies, its advantages are as follows:

[0035] This invention provides a method for the ecological restoration of acidified tobacco field soil. By combining various measures such as multiple cropping rotation, comprehensive utilization of plant residues (burning them into wood ash or using them as green manure), microbial soil improvement, and biochar organic fertilizer, a multi-dimensional ecological restoration strategy is formed. This improves the physical, chemical, and biological properties of the soil from different angles, effectively restoring the acidification of tobacco field soil. Specifically:

[0036] A crop rotation system is adopted, consisting of flue-cured tobacco, peanuts (a legume), and onions (a lily family), with intercropping of peanuts and onions (a lily family), i.e., flue-cured tobacco → peanuts + onions, a 2-year, 3-crop planting pattern. This multi-cropping rotation system can solve the problem of continuous soil acidification caused by continuous tobacco cropping, while also helping to improve land productivity.

[0037] The choice of peanuts and onions is based on their positive effects on the soil. Peanuts, a legume, typically form a symbiotic relationship with rhizobia, fixing nitrogen and improving soil nitrogen content. Onions, onions, help increase soil organic matter and reduce the number of harmful soil microorganisms. Furthermore, peanut roots are relatively deep, branching, and have a complex network, while onion roots are shallower in the topsoil. Because of these different root systems, planting them together increases soil aeration, improving soil permeability and air circulation. The combined root system of peanuts and onions forms a good network structure in the soil, effectively retaining moisture and preventing water loss. The roots of peanuts and onions provide habitats for soil microorganisms, promoting their reproduction and activity, which in turn promotes the decomposition of soil organic matter and nutrient transformation. Onion root exudates and residues can inhibit the growth and reproduction of soil-borne pathogens such as bacterial wilt and root rot, reducing the number of soil-borne pathogens and thus mitigating the severe damage caused by soil acidification and reducing losses due to diseases during the tobacco growing season.

[0038] The ash produced from burning tobacco stalks and rice husks is alkaline. Applying it once a year can neutralize soil acidity, thereby increasing the soil pH and improving acidified soil. At the same time, making ash from tobacco stalks allows for the comprehensive utilization of straw, reducing waste of straw resources and also reducing the spread of pathogenic microorganisms associated with tobacco stalks.

[0039] Solid microbial inoculants, especially actinomycete inoculants, can increase the population of beneficial soil microorganisms, thereby inhibiting pathogenic microorganisms and reducing the occurrence of soil-borne diseases; they also help increase the diversity and activity of soil microorganisms and improve the soil ecosystem. Applying microbial inoculants together with green manure (plant residues) can accelerate the decomposition of green manure and increase soil organic matter.

[0040] Wood ash, microbial inoculants, and onion and peanut plant residues, when added to the soil as green manure, help increase soil organic matter content, improve soil structure, and provide nutrients needed for plant growth. Simultaneously, onion and peanut plant residues, as green manure, enhance soil organic matter, improve soil buffering capacity, and stabilize soil pH.

[0041] By processing peanut pods into biochar and combining it with ammonium nitrate, potassium sulfate, calcium phosphate, zeolite powder, and bone meal to create a mixed powder, organic matter and nutrients necessary for soil improvement and crop growth can be provided. The prepared biochar organic fertilizer contains the mixed powder, which is encapsulated in polybutylene succinate (PBS) to allow for the slow release of nutrients, providing the organic matter and nutrients needed by tobacco. Furthermore, the actinomycete inoculant has a certain decomposition effect on PBS, enabling the release of the mixed powder in the organic fertilizer. Attached Figure Description

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0043] Figure 1 A flowchart illustrating the experimental process of an ecological restoration method for acidified tobacco field soil provided in an embodiment of the present invention. Detailed Implementation

[0044] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Figure 1 A flowchart illustrating the experimental process of an ecological restoration method for acidified tobacco field soil provided in an embodiment of the present invention.

[0046] Example 1

[0047] A method for ecological restoration of acidified tobacco field soil includes:

[0048] Tobacco straw and rice husks are burned to produce wood ash; during tilling of acidified tobacco fields, the wood ash and solid microbial inoculant are spread and then tilled and ridged; the solid microbial inoculant is an actinomycete inoculant, added at a rate of 45 kg / hm. 2 The amount of wood ash added is 1000 kg / hm². 2 .

[0049] In the second year, peanuts and onions were planted in acidified soil; one month after the peanuts were sown, the onions were transplanted (intercropping); the peanuts were planted with a row spacing of 60cm and a plant spacing of 25cm, and the onions were planted between two peanut plants.

[0050] During the peanut harvest, the peanut fruits are picked to obtain peanut pods and peanut remnants; during the onion harvest, the onion bulbs are picked to obtain onion bulbs and onion remnants.

[0051] Wood ash, solid microbial inoculants, and onion and peanut residues were incorporated into the acidified soil as green manure to a depth of 15 cm. The solid microbial inoculant was an actinomycete inoculant, added at a rate of 45 kg / hm². 2The amount of wood ash added is 1000 kg / hm². 2 .

[0052] Peanut pods are dried to obtain dried peanut pods. The dried peanut pods are crushed and then coked under anaerobic conditions to obtain biochar. Calcium phosphate, zeolite powder, bone meal and biochar are mixed in a weight ratio of 6:2:3:14 to obtain a mixed powder. Polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain biochar organic fertilizer.

[0053] When tilling and ridging the tobacco field, biochar organic fertilizer is applied as a base fertilizer in strips into the acidified soil at a rate of 750 kg / hm². 2 This completes the remediation of soil acidification.

[0054] Example 2

[0055] A method for ecological restoration of acidified tobacco field soil includes:

[0056] Tobacco straw and rice husks are burned to produce wood ash; during tilling of acidified tobacco fields, the wood ash and solid microbial inoculant are spread and then tilled and ridged; the solid microbial inoculant is an actinomycete inoculant, added at a rate of 60 kg / hm². 2 The amount of wood ash added is 1500 kg / hm². 2 .

[0057] In the second year, peanuts and onions were planted in acidified soil; 1.5 months after peanuts were sown, onions were transplanted (intercropping); peanuts were planted with a row spacing of 80cm and a plant spacing of 30cm, and onions were planted between two peanut plants.

[0058] During the peanut harvest, the peanut fruits are picked to obtain peanut pods and peanut remnants; during the onion harvest, the onion bulbs are picked to obtain onion bulbs and onion remnants.

[0059] Wood ash, solid microbial inoculants, and onion and peanut residues were incorporated into the acidified soil as green manure to a depth of 20 cm. The solid microbial inoculant was an actinomycete inoculant, added at a rate of 60 kg / hm². 2 The amount of wood ash added is 1500 kg / hm². 2 .

[0060] Peanut pods are dried to obtain dried peanut pods. The dried peanut pods are crushed and then coked under anaerobic conditions to obtain biochar. Calcium phosphate, zeolite powder, bone meal and biochar are mixed in a weight ratio of 8:2:6:16 to obtain a mixed powder. Polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain biochar organic fertilizer.

[0061] When tilling and ridging the tobacco field, biochar organic fertilizer is applied as a base fertilizer in strips into the acidified soil at a rate of 1200 kg / hm². 2 This completes the remediation of soil acidification.

[0062] Example 3

[0063] A method for ecological restoration of acidified tobacco field soil includes:

[0064] Tobacco straw and rice husks are burned to produce wood ash; during tilling of acidified tobacco fields, the wood ash and solid microbial inoculant are spread and then tilled and ridged; the solid microbial inoculant is an actinomycete inoculant, added at a rate of 50 kg / hm². 2 The amount of wood ash added is 1200 kg / hm². 2 .

[0065] In the second year, peanuts and onions were planted in acidified soil; 1.3 months after peanut sowing, onions were transplanted (intercropping); peanuts were planted with a row spacing of 70cm and a plant spacing of 27cm, and onions were planted between two peanut plants.

[0066] During the peanut harvest, the peanut fruits are picked to obtain peanut pods and peanut remnants; during the onion harvest, the onion bulbs are picked to obtain onion bulbs and onion remnants.

[0067] Wood ash, solid microbial inoculants, and onion and peanut residues were incorporated into the acidified soil as green manure to a depth of 17 cm. The solid microbial inoculant was an actinomycete inoculant, added at a rate of 50 kg / hm². 2 The amount of wood ash added is 1200 kg / hm². 2 .

[0068] Peanut pods are dried to obtain dried peanut pods. The dried peanut pods are crushed and then coked under anaerobic conditions to obtain biochar. Calcium phosphate, zeolite powder, bone meal and biochar are mixed in a weight ratio of 7:2:4:15 to obtain a mixed powder. Polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain biochar organic fertilizer.

[0069] When tilling and ridging the tobacco field, biochar organic fertilizer is applied as a base fertilizer in strips into the acidified soil at a rate of 1000 kg / hm². 2 This completes the remediation of soil acidification.

[0070] Example 4

[0071] A method for remediating acidified tobacco field soil includes:

[0072] Tobacco straw and rice husks are burned to produce wood ash; during plowing of acidified tobacco fields, the wood ash and solid microbial inoculant are spread and then plowed and ridged; the solid microbial inoculant is an actinomycete inoculant, added at a rate of 52 kg / hm. 2 The amount of wood ash added is 1300 kg / hm². 2 .

[0073] In the second year, peanuts and onions were planted in acidified soil; onions were transplanted (intercropping) 1.2 months after peanut sowing; peanuts were planted with a row spacing of 65cm and a plant spacing of 25cm, and onions were planted between two peanut plants.

[0074] During the peanut harvest, the peanut fruits are picked to obtain peanut pods and peanut remnants; during the onion harvest, the onion bulbs are picked to obtain onion bulbs and onion remnants.

[0075] Wood ash, solid microbial inoculants, and onion and peanut residues were incorporated into the acidified soil as green manure to a depth of 18 cm. The solid microbial inoculant was an actinomycete inoculant, added at a rate of 52 kg / hm². 2 The amount of wood ash added is 1300 kg / hm². 2 .

[0076] Peanut pods are dried to obtain dried peanut pods. The dried peanut pods are crushed and then coked under anaerobic conditions to obtain biochar. Calcium phosphate, zeolite powder, bone meal and biochar are mixed in a weight ratio of 6:2-6:14 to obtain a mixed powder. Polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain bio-organic fertilizer.

[0077] When tilling and ridging the tobacco field, biochar organic fertilizer is applied as a base fertilizer in strips into the acidified soil at a rate of 1100 kg / hm². 2 This completes the remediation of soil acidification.

[0078] Example 5

[0079] A method for remediating acidified tobacco field soil includes:

[0080] Tobacco straw and rice husks are burned to produce wood ash; during tilling of acidified tobacco fields, the wood ash and solid microbial inoculant are spread and then tilled and ridged; the solid microbial inoculant is an actinomycete inoculant, added at a rate of 55 kg / hm. 2 The amount of wood ash added is 1400 kg / hm². 2 .

[0081] In the second year, peanuts and onions were planted in acidified soil; 1.1 months after peanut sowing, onions were transplanted (intercropping); peanuts were planted with a row spacing of 75cm and a plant spacing of 30cm, and onions were planted between two peanut plants.

[0082] During the peanut harvest, the peanut fruits are picked to obtain peanut pods and peanut remnants; during the onion harvest, the onion bulbs are picked to obtain onion bulbs and onion remnants.

[0083] Wood ash, solid microbial inoculants, and onion and peanut residues were incorporated into the acidified soil as green manure to a depth of 19 cm. The solid microbial inoculant was an actinomycete inoculant, added at a rate of 55 kg / hm². 2 The amount of wood ash added is 1400 kg / hm². 2 .

[0084] Peanut pods are dried to obtain dried peanut pods. The dried peanut pods are crushed and then coked under anaerobic conditions to obtain biochar. Calcium phosphate, zeolite powder, bone meal and biochar are mixed in a weight ratio of 6:2:5:15 to obtain a mixed powder. Polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain biochar organic fertilizer.

[0085] When tilling and ridging the tobacco field, biochar organic fertilizer is applied as a base fertilizer in strips into the acidified soil at a rate of 950 kg / hm². 2 This completes the remediation of soil acidification.

[0086] Experimental Example 1

[0087] In the third year after soil acidification remediation, the soil physicochemical properties of Examples 1-5 and the blank control (tobacco field with continuous cropping) were tested. Specifically, the organic matter content, available nitrogen content, available phosphorus content, available potassium content, pH value, soil bulk density and soil porosity were tested. The test results are shown in Table 1.

[0088] Table 1 Soil physicochemical properties

[0089]

[0090] As can be seen from the above test results, compared with blank acidified soil, the soil acidification ecological restoration method of Examples 1-5 of the present invention can effectively increase the content of organic matter, available nitrogen, available phosphorus, available potassium, pH value and soil porosity in the soil.

[0091] Experimental Example 2

[0092] In the third year after soil acidification remediation, the soil microbial enzyme activities of the soils in Examples 1-5 and the blank control (continuously cropped tobacco field) were tested. Specifically, the soil urease activity, phosphatase activity, catalase activity and sucrase activity were tested. The test results are shown in Table 2.

[0093] Table 2 Soil enzyme activity

[0094]

[0095] As can be seen from the above test results, compared with the blank acidified soil, the soil acidification ecological restoration method of Examples 1-5 of the present invention can effectively improve the activity of urease, phosphatase, catalase and sucrase in the soil.

[0096] Understandably, peanuts have relatively deep, branching, and complex root systems, while onions have shallower roots in the topsoil. Planting them together creates a multi-layered root network, increasing soil aeration and improving soil permeability and air circulation. The complex root network of peanuts and onions helps retain soil moisture effectively and slows water loss. Maintaining soil moisture is beneficial for maintaining soil humidity, improving water use efficiency for plant growth, and resisting drought. The roots of peanuts and onions provide excellent habitats for soil microorganisms. This microbial-rich environment promotes microbial reproduction and activity, thereby promoting the decomposition of organic matter and nutrient transformation in the soil. This plays a crucial role in the health of the soil ecosystem and nutrient cycling.

[0097] Adding plant residues such as wood ash, onion, and peanut residues as green manure, as well as biochar organic fertilizer prepared through mixed powders, can provide abundant organic matter, thereby increasing the soil's organic matter content. Organic matter plays a vital role in soil water and fertilizer retention capacity, microbial ecosystems, and plant growth. The addition of plant residues in green manure and organic fertilizers helps improve soil structure, increase the stability of soil aggregates, improve soil permeability and aeration, slow down water and nutrient loss, and thus improve the overall soil texture. In particular, increased soil organic matter enhances soil buffering capacity, which helps maintain the stability of increased soil pH. The various plant residues, mineral elements, and organic matter contained in green manure and organic fertilizers can provide abundant nutrients for plants, promoting healthy plant growth, which is of great significance for repairing damaged soil and promoting vegetation recovery. The addition of solid microbial agents, especially actinomycete agents, helps increase the diversity and activity of soil microorganisms. Microorganisms play a key role in the soil in decomposing organic matter, fixing nitrogen, and promoting nutrient cycling; therefore, enhancing microbial activity helps maintain the balance of the soil ecosystem. By encapsulating polybutylene succinate, the mixed powder in organic fertilizer can slowly release nutrients, which helps to provide plants with the organic matter and nutrients they need, reduce nutrient loss, and improve nutrient utilization efficiency.

[0098] In summary, this invention utilizes a multi-cropping system of three crops every two years, the resource utilization of straw, and the improvement of soil by microbial agents. It fully leverages the growth characteristics of different crops and the soil-improving properties of different residual plants. This solution not only repairs acidified soil but also comprehensively considers multiple aspects such as soil structure, water management, and microbial activity, creating a more favorable ecological environment for the soil.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for ecological restoration of acidified tobacco field soil, characterized in that, include: Tobacco residues and rice husks are burned into wood ash; In the acidified tobacco fields where flue-cured tobacco was planted that year, wood ash and solid microbial agents were spread to neutralize the soil acidity, increase the pH value of the tobacco field soil, and the soil was plowed and ridged. In the second year, legumes and onions were planted in the acidified soil; During the growth stage of the legume, the fruit of the legume is harvested to obtain the legume fruit and the remaining legume plant. The onions and the remaining legume plants are incorporated into the acidified soil as green manure; The fruits of the legume plants are processed into organic fertilizer, which is then applied to the acidified soil to restore the soil acidification. When planting legumes and onions in acidified soil, the method includes: sowing the onions 1-1.5 months after sowing the legumes; The method for preparing the organic fertilizer is as follows: The fruits of the aforementioned legumes were processed into biochar; Calcium phosphate, zeolite powder, bone meal and biochar are mixed to obtain a mixed powder, and polybutylene succinate is used as an encapsulating material to encapsulate the mixed powder to obtain the organic fertilizer. The method for preparing the biochar includes: The fruits of the legume plant are dried to obtain dried fruits, and the dried fruits are crushed and then coked under anaerobic conditions to obtain the biochar. The legume in question is peanut; The solid microbial agent is an actinomycete agent.

2. The method for ecological restoration of acidified tobacco field soil according to claim 1, characterized in that, The legumes are planted with a row spacing of 60-80cm and a plant spacing of 25-30cm, and the onions are planted between two legumes.

3. The method for ecological restoration of acidified tobacco field soil according to claim 1, characterized in that, When the onions and legume residues are incorporated into the acidified soil as green manure, wood ash and solid microbial agents are also incorporated into the acidified soil.

4. The method for ecological restoration of acidified tobacco field soil according to claim 3, characterized in that, The wood ash, the solid microbial agent, the legume residues and / or the onion are compacted into the acidified soil to a depth of 15-20 cm.

5. The method for ecological restoration of acidified tobacco field soil according to claim 1, characterized in that, When applying the organic fertilizer to the acidified soil to remediate the soil acidification, the process includes: After the onions and legume residues are incorporated into the acidified soil as green manure for 2-4 days, the organic fertilizer is applied to the acidified soil.

6. The method for ecological restoration of acidified tobacco field soil according to claim 1, characterized in that, The fruit of the legume is a peanut pod.

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