CN112189395B - Method for biologically improving saline-alkali soil - Google Patents
Method for biologically improving saline-alkali soil Download PDFInfo
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- CN112189395B CN112189395B CN202010865150.4A CN202010865150A CN112189395B CN 112189395 B CN112189395 B CN 112189395B CN 202010865150 A CN202010865150 A CN 202010865150A CN 112189395 B CN112189395 B CN 112189395B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/005—Precision agriculture
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/40—Fabaceae, e.g. beans or peas
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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K2101/00—Agricultural use
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a method for biologically improving saline-alkali soil, which is mainly used for improving the saline-alkali soil by planting salt-tolerant plants such as alfalfa and the like in the saline-alkali soil, improving the land utilization rate and solving the problem of harm of salinization to the land. Wherein, the saline-alkali soil is comprehensively improved by physical, chemical and biological methods, and salt is reasonably discharged and is prevented from being returned by deep ploughing, deep scarification, biological fertilizer, microbial agent and alfalfa planting; and the acidity regulator is also utilized to reduce the salinity and pH value of the saline-alkali soil, so as to be beneficial to the growth of the alfalfa and achieve the effect of bioremediation of the saline-alkali soil.
Description
Technical Field
The invention belongs to the technical field of saline-alkali soil treatment, and particularly relates to a method for biologically improving saline-alkali soil.
Background
Saline-alkali soil is formed by redistributing and gathering easily soluble salts in soil to a surface layer under adverse natural conditions such as climate, terrain, soil texture, hydrology and the like. Of course, the unreasonable development of water and soil resources and extensive agricultural cultivation system are also important factors for producing salinization of soil.
At present, the saline-alkali soil improvement method mainly comprises a hydraulic engineering improvement method, an agricultural production improvement method, a chemical improvement method and a biological improvement method. The water conservancy project improvement method is mainly to bring the salt in the area outside through the water conservancy project measures such as irrigation and drainage, the agricultural improvement method is mainly to accelerate the salt sprinkling, enhance the soil moisture conservation and drought resistance capability and improve the nutrient condition of the soil through the measures such as deep ploughing, deep scarification, land leveling and the like; the chemical improvement method is to use chemical substances such as gypsum, acetic acid, citric acid and the like which have no harmful residues and are nontoxic to neutralize and improve the soil; the biological improvement method is to plant the crops according to the adaptability of the crops to saline-alkali, drought and waterlogging, reasonably arrange the crops according to the soil, improve the soil environment and exert the agricultural yield-increasing potential. Relatively, the water conservancy project improvement method treats the symptoms of the saline-alkali soil but not the root causes, the agricultural improvement cost is large, the capital is large, and the service life after treatment is short; although the chemical improvement takes effect quickly, the chemical improvement is easy to cause secondary pollution, and has high technical requirements on large capital investment and difficult large-area implementation; the biological improvement can obtain better ecological benefit and economic benefit, but the improvement period is longer, the effect is slower, however, only the biological improvement method can gradually change the physical characteristics of the soil, the soil structure is changed, the texture becomes loose, the air permeability and the water storage capacity are enhanced, the method is an economic and effective measure for repairing the salinized soil, and the final goal of repairing the saline-alkali soil is to realize the recovery and reconstruction of the vegetation.
The alfalfa, the Latin name, is perennial herb of Medicago sativa of Rosales, Leguminosae and Medicago, has thick and strong root, and developed rhizome after penetrating into soil layer. It is called the king of pasture due to its high yield, rich protein, good palatability, strong adaptability, etc. Alfalfa is a perennial plant, the general growth period can reach about 10 years, the luxuriant branches and leaves thereof can prevent rainwater from physically scouring soil and runoff on the ground in summer, the ground surface coverage is high in autumn and winter, the surface soil can not be eroded by strong wind, the wind and sand content in the air is reduced, and the alfalfa is known as 'water conservation pioneer' in loess plateau areas with serious water and soil loss. The alfalfa roots are developed and deeply buried, the root system can generally reach 3-5 meters, the longest root system can reach more than 10 meters, therefore, the alfalfa roots can absorb moisture in the deep layer of soil, the drought resistance is naturally high, a large number of root nodules growing on huge root systems can fix nitrogen biologically, 32.9 kilograms of nitrogen are fixed per mu, and the quantity of the nitrogen is equivalent to 2460 kilograms of ammonium sulfate, so that the soil fertility is greatly improved, the characteristics are very beneficial to rotation of a grassland, the yield and the quality of succeeding crops can be obviously improved, the fertilizer investment is reduced, and the environmental pollution caused by the large amount of the fertilizer investment is reduced.
In view of the above, the invention aims to improve the saline-alkali soil by planting alfalfa and other plants on the saline-alkali soil, improve the utilization rate of the soil and solve the problem of harm of salinization to the soil.
Disclosure of Invention
The invention aims to provide a method for biologically improving saline-alkali soil, which is mainly used for improving the saline-alkali soil by planting alfalfa and other plants in the saline-alkali soil, improving the land utilization rate and solving the problem of harm of salinization to the land.
In order to achieve the purpose, the invention provides the following technical scheme, and the method for biologically improving the saline-alkali soil comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 3-5 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 5-10 days;
(3) applying the acidity regulator into the soil in the step (2) along with water according to the concentration of 0.5-10%, and watering thoroughly until the water penetrates into the surface layer and is slightly dry; applying an amount of an acidity regulator until the pH of the soil at a depth of 10-20cm reaches 8.0 or less;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 3-5 days;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 60-80cm, a black film is coated on the drip irrigation pipes after the drip irrigation pipes are laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing alfalfa seeds, covering a film, and carrying out field management of weeding and fertilizing.
Further, the soil conditioner comprises 30-40 parts of a biological organic fertilizer, 30-40 parts of desulfurized gypsum, 15-20 parts of humic acid, 5-15 parts of EDTA chelated zinc, 2-4 parts of monopotassium phosphate, 3-5 parts of pyroligneous liquor, 30-45 parts of plant ash, 5-15 parts of kaolin and 15-18 parts of a water-retaining agent;
further, the acidity regulator is one or more of citric acid, acetic acid and lactic acid;
further, the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcaligenes halophilus and bacillus mucilaginosus, and the viable count is more than or equal to 1 × 109Preferably, the weight ratio of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, bacillus halophilus and bacillus mucilaginosus is 0.8-1.2: 0.1-0.3: 0.1 to 0.3;
further, the microelement solution is EDTA-Mn 50-60 μ M/L, ferric sulfate 30-40 μ M/L, boric acid 20-30 μ M/L, sodium molybdate 10-20 μ M/L, sodium selenate 10-15 μ M/L, copper chloride 10-20 μ M/L;
further, the sowing of the alfalfa is that the sowing row spacing is 20-30cm, the sowing depth is 1-2cm, and the sowing quantity is 1-1.5kg per mu;
further, the film in the step (6) is removed in combination with intertillage and topdressing in the field management process.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the saline-alkali soil is comprehensively improved by physical, chemical and biological methods, and salt is reasonably removed and is prevented from being returned by deep ploughing and deep scarification, biological fertilizer and microbial agent and planting alfalfa; particularly, the acidity regulator is used for reducing the salt content and the pH value of the saline-alkali soil so as to be beneficial to the growth of the alfalfa and achieve the effect of bioremediation of the saline-alkali soil;
(2) the microorganisms in the microbial agent can play a role in assisting in resisting salt and alkali, participate in the formation of soil fertility, including the transformation of substances and energy in soil, the formation and decomposition of humus, the release of nutrients, the fixation of nitrogen and the like, can improve soil hardening, stimulate the soil vitality, provide extra hormones and antibiotics for natural plant growth, inhibit fungi and nematodes in soil and plant root diseases and insect pests, and fundamentally reduce the use amount of pesticides and improve the quality of alfalfa;
(3) according to the invention, the soil conditioner is added before planting after soil preparation, so that not only can the fertility of the soil be improved, but also the alfalfa can grow better, and further the saline-alkali soil can be better improved to form a virtuous circle; the cost is saved, the soil is not barren, hardened and salinized, and the trend of energy conservation, environmental protection and sustainable development is met;
(4) according to the invention, the technology of film-covering drip irrigation is adopted in the growth stage of the alfalfa, the capillary directly conveys water to the roots of the crops in a dripping shape, the root area is uniformly, regularly and quantitatively infiltrated, the water-salt environment of the soil in the root area is obviously improved, the growth of the alfalfa is further promoted, and the saline-alkali soil is further repaired.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A method for biologically improving saline-alkali soil comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 5 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 10 days; the soil conditioner comprises 40 parts of a biological organic fertilizer, 40 parts of desulfurized gypsum, 20 parts of humic acid, 15 parts of EDTA chelated zinc, 4 parts of monopotassium phosphate, 5 parts of wood vinegar, 45 parts of plant ash, 15 parts of kaolin and 18 parts of a water-retaining agent;
(3) applying an acidity regulator into the soil in the step (2) along with water according to the concentration of 5%, and watering thoroughly until the water penetrates into the surface layer and is slightly dry; applying an acidity regulator citric acid in an amount until the pH of the soil reaches below 8.0 at a depth of 10-20 cm;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 3 days; the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, halophilic bacillus and bacillus mucilaginosus, and the viable count is more than or equal to 1 multiplied by 109And each ml of the mixture is prepared from azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcalophilus halophilus and bacillus mucilaginosus in a weight ratio of 0.8:0.8:0.8:0.8:0.3:0.3: 0.3: 0.1; the microelement solution comprises EDTA-Mn 60 muM/L, ferric sulfate 40 muM/L, boric acid 20 muM/L, sodium molybdate 10 muM/L, sodium selenate 15 muM/L and copper chloride 20 muM/L;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 80cm, the drip irrigation pipes are covered with black films after being laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing the alfalfa seeds, wherein the sowing row spacing is 20cm, the sowing depth is 2cm, and the sowing quantity is 1.4kg per mu; and covering a film, and carrying out weeding and fertilizing field management, wherein the film is removed in the field management process in combination with intertillage and topdressing.
Example 2
A method for biologically improving saline-alkali soil comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 4 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 8 days; the soil conditioner comprises 30 parts of a biological organic fertilizer, 35 parts of desulfurized gypsum, 20 parts of humic acid, 15 parts of EDTA chelated zinc, 4 parts of monopotassium phosphate, 5 parts of wood vinegar, 45 parts of plant ash, 5 parts of kaolin and 16 parts of a water-retaining agent;
(3) applying the acidity regulator into the soil in the step (2) along with water according to the concentration of 10%, and watering thoroughly until the water penetrates into the surface layer and is slightly dry; applying acidity regulator acetic acid until pH of soil with depth of 10-20cm reaches below 8.0;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 5 days; the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, halophilic bacillus and bacillus mucilaginosus, and the viable count is more than or equal to 1 multiplied by 109And each ml of the mixture is prepared from azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcalophilus halophilus and bacillus mucilaginosus in a weight ratio of 0.8:0.8:0.8:0.8:0.3:0.3: 0.3: 0.2; the microelement solution is EDTA-Mn 55 MuM/L, ferric sulfate 35 MuM/L, boric acid 24 MuM/L, sodium molybdate 12 MuM/L, sodium selenate 14 MuM/L, copper chloride 18 MuM/L;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 70cm, the drip irrigation pipes are covered with black films after being laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing the alfalfa seeds, wherein the sowing row spacing is 30cm, the sowing depth is 1cm, and the sowing quantity is 1.2kg per mu; and covering a film, and carrying out weeding and fertilizing field management, wherein the film is removed in the field management process in combination with intertillage and topdressing. Example 3
A method for biologically improving saline-alkali soil comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 4 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 7 days; the soil conditioner comprises 35 parts of a biological organic fertilizer, 35 parts of desulfurized gypsum, 20 parts of humic acid, 15 parts of EDTA chelated zinc, 4 parts of monopotassium phosphate, 5 parts of wood vinegar, 45 parts of plant ash, 5 parts of kaolin and 17 parts of a water-retaining agent;
(3) applying the acidity regulator into the soil in the step (2) along with water according to the concentration of 0.5%, and completely watering until the water penetrates into the surface layer and is slightly dry; applying the amount of lactic acid serving as an acidity regulator until the pH of the soil with the depth of 10-20cm is below 8.0;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 5 days; the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, halophilic bacillus and bacillus mucilaginosus, and the viable count is more than or equal to 1 multiplied by 109Preferably, the weight ratio of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcaligenes halophilus and bacillus mucilaginosus is 1:0.8:1:0.8:0.3:0.3: 0.3: 0.2; the microelement solution is EDTA-Mn 55 MuM/L, ferric sulfate 30 MuM/L, boric acid 20 MuM/L, sodium molybdate 12 MuM/L, sodium selenate 14 MuM/L, copper chloride 18 MuM/L;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 60cm, the drip irrigation pipes are covered with black films after being laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing the alfalfa seeds, wherein the row spacing of the sowing is 20cm, the sowing depth is 1cm, and the sowing quantity is 1.1kg per mu; and covering a film, and carrying out weeding and fertilizing field management, wherein the film is removed in the field management process in combination with intertillage and topdressing.
Example 4
A method for biologically improving saline-alkali soil comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 5 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 9 days; the soil conditioner comprises 30 parts of biological organic fertilizer, 35 parts of desulfurized gypsum, 15 parts of humic acid, 8 parts of EDTA chelated zinc, 3 parts of monopotassium phosphate, 5 parts of wood vinegar, 45 parts of plant ash, 5 parts of kaolin and 16 parts of water retention agent
(3) Applying the acidity regulator into the soil in the step (2) along with water according to the concentration of 7%, and watering thoroughly until the water penetrates into the surface layer and is slightly dry; applying acidity regulator acetic acid until pH of soil with depth of 10-20cm reaches below 8.0;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 4 days; the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, halophilic bacillus and bacillus mucilaginosus, and the viable count is more than or equal to 1 multiplied by 109Preferably, the weight ratio of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcaligenes halophilus and bacillus mucilaginosus is 0.8:0.8:0.8:0.3:0.1: 0.2; the microelement solution is EDTA-Mn 55 MuM/L, ferric sulfate 35 MuM/L, boric acid 24 MuM/L, sodium molybdate 12 MuM/L, sodium selenate 14 MuM/L, copper chloride 18 MuM/L;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 80cm, the drip irrigation pipes are covered with black films after being laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing the alfalfa seeds, wherein the sowing row spacing is 25cm, the sowing depth is 2cm, and the sowing quantity is 1.3kg per mu; and covering a film, and carrying out weeding and fertilizing field management, wherein the film is removed in the field management process in combination with intertillage and topdressing.
Tests are carried out according to the method for biologically improving the saline-alkali soil in the embodiments 1 to 4, the improvement condition of the saline-alkali soil is tested, and the specific results are shown in the table 1:
TABLE 1
Therefore, by the biological improvement method, the total salt content and the pH value of the saline-alkali soil are obviously reduced, the total nitrogen content and the organic matter content are obviously increased, and the soil quality is obviously improved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for biologically improving saline-alkali soil is characterized by comprising the following steps: the method comprises the following steps:
(1) deeply ploughing and deeply loosening the saline-alkali soil to break the soil, wherein the soil breaking depth is 25-35cm, and exposing the saline-alkali soil for 3-5 days;
(2) applying a soil conditioner, deep ploughing and deep scarification again for turning the soil, wherein the soil breaking depth is 25-35 cm; treating for 5-10 days;
(3) applying the acidity regulator into the soil in the step (2) along with water according to the concentration of 0.5-10%, and watering thoroughly until the water penetrates into the surface layer and is slightly dry; applying an amount of an acidity regulator until the pH of the soil at a depth of 10-20cm reaches 8.0 or less;
(4) continuously applying a microbial agent and a trace element solution to the soil in the step (3) for 3-5 days;
(5) laying drip irrigation pipes, wherein the laying direction of the drip irrigation pipes is parallel to the short side of the land, the distance between every two adjacent drip irrigation pipes is 60-80cm, a black film is coated on the drip irrigation pipes after the drip irrigation pipes are laid, and the salt content in the soil is dissolved in a fresh water drip irrigation salt spraying mode, so that the total salt content of the soil is reduced to below 8.0 g/kg;
(6) sowing alfalfa seeds, covering a film, and carrying out field management of weeding and fertilizing.
2. The method for biologically improving saline-alkali soil according to claim 1, wherein the method comprises the following steps: the soil conditioner comprises 30-40 parts of a biological organic fertilizer, 30-40 parts of desulfurized gypsum, 15-20 parts of humic acid, 5-15 parts of EDTA chelated zinc, 2-4 parts of monopotassium phosphate, 3-5 parts of wood vinegar, 30-45 parts of plant ash, 5-15 parts of kaolin and 15-18 parts of a water-retaining agent.
3. The method for biologically improving saline-alkali soil according to claim 1, wherein the method comprises the following steps: the acidity regulator is one or more of citric acid, acetic acid and lactic acid.
4. The method for biologically improving saline-alkali soil according to claim 1, wherein the method comprises the following steps: the microbial agent is powder of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, halophilic bacillus and bacillus mucilaginosus, and the viable count is more than or equal to 1 multiplied by 109One per ml.
5. The method for biologically improving saline-alkali soil according to claim 4, wherein the method comprises the following steps: the weight ratio of azotobacter chroococcum, trichoderma koningii, beauveria bassiana, bacillus licheniformis, streptomyces fradiae, bacillus thuringiensis, alcaligenes halophilus and bacillus mucilaginosus is (0.8-1.2)/(0.1-0.3): 0.1 to 0.3.
6. The method for biologically improving saline-alkali soil according to claim 1, wherein the method comprises the following steps: the microelement solution is EDTA-Mn 50-60 μ M/L, ferric sulfate 30-40 μ M/L, boric acid 20-30 μ M/L, sodium molybdate 10-20 μ M/L, sodium selenate 10-15 μ M/L, and cupric chloride 10-20 μ M/L.
7. The method for biologically improving saline-alkali soil according to claim 1, wherein the method comprises the following steps: the sowing of the alfalfa is characterized in that the sowing row spacing is 20-30cm, the sowing depth is 1-2cm, and the sowing quantity is 1-1.5kg per mu.
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| CN113412697B (en) * | 2021-07-28 | 2023-03-14 | 青岛万慧源环保科技有限公司 | Improvement method of saline-alkali soil |
| CN113973654A (en) * | 2021-11-05 | 2022-01-28 | 宁夏农林科学院农业资源与环境研究所（宁夏土壤与植物营养重点实验室） | Method for improving emergence rate of alfalfa planting in moderate saline-alkali soil in northern arid area |
| CN116210390A (en) * | 2023-04-21 | 2023-06-06 | 西北农林科技大学 | Method for rapidly improving saline-alkali soil |
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