Remediation Bacterial Agent for Buffering Soil Salinity in Arid Areas and Its Production and Application Methods

Abstract

The present invention discloses a soil salinization and alkali remediation agent for arid regions, and its production and application methods. The agent has a granular coating structure, formed by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a salinization and alkali-modifying microbial strain layer, a pH-sensitive material layer, a humate protective layer, and an acidic organic matter B layer, from the outside to the inside. The weight ratio of the layers from the outside to the inside is (0.5-1.5): (25-35): (3-9): (1-2): (0.5-1.5): (5-15). The sensitive material layer, the humate protective layer, and the acidic organic matter B layer are repeatedly coated according to the number of drip irrigations for crops, and the number of repeated coatings is positively correlated with the number of drip irrigations. The sensitive material is selected from a material that dissolves only when the ambient pH is ≥7, and the humate is selected from a humate that dissolves when the pH is ≥8. The present invention solves the problem of poor application effectiveness of traditional saline-alkali soil remediation agents.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizers, and in particular to a repairing bacterial agent for buffering soil salinity and alkali in arid areas, and a production and application method thereof. Background Art

[0002] The arid northern region is characterized by limited water resources, and saline-alkali soils exhibit a characteristic of water-salt movement: "alkali follows water." "Water-salt movement" refers to the movement of water and the salts it carries within a medium. The water-salt movement system consists of surface water, groundwater, and vegetation subsystems, and the salts in the soil move with the water. During evaporation, salts dissolved in water are transported to the soil surface. When the water evaporates, the salts accumulate in the surface soil. After drip irrigation, these surface salts are dissolved by fresh water and seep deeper into the soil. If, over a period of time, soil evaporation is high and the salts it carries accumulate to the surface, the soil becomes saline, which is detrimental to agricultural production and vegetation growth in saline-alkali lands. Therefore, it is necessary to carry out drip irrigation to suppress salt at the key nodes of crop germination and young tissue growth, reduce salt stress in the plow layer, and ensure normal crop production. However, in saline-alkali soils, alkaline solutions have a faster effect on crop stress than salt stress. Therefore, while using water to suppress salt, it is also necessary to quickly and effectively reduce the pH value of the plow layer. If the pH value of the plow layer is lowered by drip irrigation of acidic liquids, if there is too little acidic substance, it will be consumed in the surface plow layer and cannot act on the plow layer of the vegetation subsystem; if there is too much acidic substance, it will cause surface acid stress and harm the stems and leaves of plants. Therefore, it is necessary to apply a soil remediation bacterial agent that can release acidic substances under drip irrigation conditions at key crop growth nodes.

[0003] At present, traditional remediation bacterial agents for alleviating soil alkalinity often use simple acidic organic matter to make raw particles, or use slow-release materials to slowly release acidic substances; ① Products made of simple acidic organic matter will react with alkaline substances in the soil and be consumed in advance after being applied to the soil. Although the soil pH is reduced in a short period of time, after drip irrigation, the pH of the soil plow layer will rise again with the "water and salt movement"; ② Although the use of slow-release materials can solve the problem of premature consumption, its release rate is slow. On the one hand, there is consumption during the non-drip irrigation period, and on the other hand, the acidic substances cannot be released quickly during the drip irrigation period, resulting in poor application effect of saline-alkali soil remediation bacterial agents. Summary of the Invention

[0004] The purpose of the present invention is to provide a repair bacteria agent for buffering soil salinity and alkali in arid areas, which solves the problems faced by traditional soil alkalinity repair bacteria agent materials.

[0005] To achieve the above object, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a remediation bacterial agent for buffering soil salinity and alkali in arid areas. The remediation bacterial agent has a granular coating structure, which is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a salt-alkali improving microbial strain layer, a pH-sensitive material layer, a humate protective layer, and an acidic organic matter B layer from the outside to the inside, and the weight ratio of each layer from the outside to the inside is (0.5-1.5): (25-35): (3-9): (1-2): (0.5-1.5): (5-15); wherein the sensitive material layer, the humate protective layer, and the acidic organic matter B layer are repeatedly coated according to the number of drip irrigation times of crops, and the number of repeated coatings is positively correlated with the number of drip irrigation times; the sensitive material is a material that dissolves only when the environmental pH is ≥7, and the humate is a humate that dissolves when the pH is ≥8 (all humates are alkaline-soluble, and humates with different moduli have different alkaline solubility nodes).

[0007] Specifically, the present invention provides a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas. The soil remediation bacterial agent is prepared by preparing corresponding soil remediation bacterial agents for different crops, different soil salinity and alkali levels, and different irrigation water salinity and alkali levels, and is applied around the crop rhizosphere as a base application. The rhizosphere environment of the crop is improved through the initial release of acidic substances and beneficial microorganisms, ensuring normal crop emergence and timely release of acidic substances during each drip irrigation during the growth period to improve the rhizosphere environment. At the same time, the coating structure of the remediation bacterial agent is adjusted according to the number of irrigation times during the growth period of different crops; the dosage is adjusted according to the thickness of the tillage layer of different crops and the soil pH to ensure the corresponding number of acidic substance releases, thereby solving the problem of poor application effect of traditional saline-alkali soil remediation bacterial agents.

[0008] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the hydrolysis coating material is selected from one or more of gum arabic, gelatin, and peach gum.

[0009] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the acidic organic matter A and the acidic organic matter B are selected from one or more of citric acid, sulfinic acid, and sulfuric acid.

[0010] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the salt-alkali improving microbial strain is Bacillus, which is selected from one or more of Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens, and Bacillus velez.

[0011] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the sensitive material is acrylic resin No. III.

[0012] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the sensitive material layer, humate protective layer and acidic organic matter B layer are repeatedly coated 3 to 5 times according to the number of drip irrigation water for crops, and after repeated coating, the weight of each acidic organic matter B layer increases from the inside to the outside.

[0013] The present invention also provides a method for producing a repairing bacterial agent for buffering soil salinity and alkali in arid areas, the method comprising the following steps:

[0014] S1. Determine the salinity and water-salt movement capacity of the soil and irrigation water in the site to be remediated. Based on the results, set the proportion of acidic organic matter in each layer to ensure that there is sufficient acidic material to adjust the soil pH value during each drip irrigation.

[0015] S2. Granulate the acidic organic matter B to obtain fertilizer granules A, and keep them dry during granulation to prevent them from affecting the outer humate protective layer;

[0016] S3, embedding and granulating humate in the outer layer of the fertilizer granules A to form a humate protective layer, thereby obtaining fertilizer granules B;

[0017] S4. Coating the outer layer of the fertilizer granule B with a pH-sensitive material to form a pH-sensitive material layer, thereby obtaining a fertilizer granule C;

[0018] S5. Coating the outer layer of the fertilizer granules C with acidic organic matter B to form an acidic organic matter B layer, thereby obtaining fertilizer granules D;

[0019] S6. Repeat the coating process of steps S3 to S5 on the outer layer of the fertilizer granule D, wherein the weight of each acidic organic matter layer B increases from the inside to the outside and the outermost layer is a pH sensitive material layer, thereby obtaining a fertilizer granule E;

[0020] S7, sequentially coating the outer layer of the fertilizer granules E with a salt-alkali-modifying microbial strain and an acidic organic matter A to form a salt-alkali-modifying microbial strain layer and an acidic organic matter A layer, respectively, thereby obtaining fertilizer granules F;

[0021] S8, coating the outer layer of the fertilizer granules F with a hydrolyzed coating material to form a hydrolyzed coating material layer, completing the coating to obtain fertilizer granules G;

[0022] S9. Drying and cooling the fertilizer particles G to obtain a repairing bacterial agent for buffering soil salinity and alkali in arid areas.

[0023] Furthermore, a method for producing a repair bacterial agent for buffering soil salinity and alkali in arid areas: the drying temperature in step S9 is 55-65° C., and the drying time is 120-240 minutes.

[0024] The present invention also provides an application method of a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas: according to the thickness of the tillage layer of different crops, the above-mentioned soil remediation bacterial agent is applied in holes in the rhizosphere soil with a tillage layer thickness of ±5 cm around the drip line of drip irrigation to ensure that it takes effect around the rhizosphere of the crop; wherein the application amount of the remediation bacterial agent is 150 to 450 kg / mu, and its specific amount can be determined according to the salinization degree of the local soil and irrigation water and the thickness of the tillage layer to ensure that the release of acidic organic matter in each layer can buffer the pH of the tillage layer to below 7.

[0025] Furthermore, a method for applying a repair bacterial agent for buffering soil salinity and alkali in arid areas is provided: the crops include but are not limited to wheat, barley, sorghum, corn, soybean, cotton, sugar beet, sweet potato, potato, tomato, and pepper; wherein the thickness of the tillage layer of wheat, barley, sorghum, corn, and soybean is 5.0 to 15.0 cm, the thickness of the tillage layer of cotton, sugar beet, sweet potato, and potato is 15.0 to 25.0 cm, and the thickness of the tillage layer of tomato and pepper is 25.0 to 40.0 cm.

[0026] Beneficial effects of the present invention:

[0027] (1) The soil remediation agent for buffering soil salinity and alkali in arid areas provided by the present invention can release sufficient acidic organic matter at key drip irrigation nodes during different crop growth periods, rapidly reducing the soil pH value. When the soil pH value is adjusted to neutral, the release stops. The soil remediation agent of the present invention is targeted at the characteristics of shallow drip irrigation crop areas in arid northern China, where water resources are scarce and saline-alkali soil hinders the movement of water and salt, with alkali following water and water removing salt. The agent is applied to the tillage layer and, through controlled release, releases acidic substances at the key drip irrigation stage of crop growth, neutralizing soil alkalinity and protecting crop roots.

[0028] (2) The remediation agent of the present invention is applied to the rhizosphere soil of the tillage layer around the drip line of drip irrigation before sowing. When watering for the first time after sowing, the acidic organic matter in the outermost layer can quickly reduce the soil pH value and provide organic nutrients to the soil-improving microorganisms. The microorganisms are active in the soil, reducing soil salt stress, thereby ensuring crop emergence. Since sensitive materials are insoluble in an environment with a pH value of less than 7, after the acidic organic matter improves the soil, the remaining substances of the remediation agent particles are protected in the soil and cannot be released.

[0029] (3) Humate is characterized by its stable solid chemical properties. After dissolving in an alkaline solution, it forms an alkaline organic solution. Therefore, a layer of humate is wrapped between the acidic organic matter and the pH-sensitive material. This can not only protect the pH-sensitive material from being acid-lyzed in solid form, but also ensure that a saline-alkali environment is formed during the next drip irrigation. After the pH-sensitive material dissolves, the acidic organic material is released in water. After reacting with the alkaline solution, the acidic organic matter exists in the soil in the form of a neutral organic solution. This leaves no residue, preventing secondary pollution, and increases soil organic matter, further improving the soil environment. Under the combined action of microorganisms and acidic organic matter, the soil texture and ecological environment are gradually improved. Without affecting the normal production of crops, repeated applications can fundamentally solve the soil salinity problem. DETAILED DESCRIPTION

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] This Example 1 provides a soil remediation agent for buffering salinity and alkali in arid areas for moderately saline-alkali soil in Xiaohekou Village, Jinta County, Gansu Province (wheat planting is performed after remediation). The soil remediation agent has a granular coating structure, which is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a saline-alkali-modifying microbial strain layer, a pH-sensitive material layer, a humate protective layer, and an acidic organic matter B layer from the outside to the inside. The weight ratio of the layers from the outside to the inside is 1:30:6:1.5:1:10.

[0033] The sensitive material layer, the humate protective layer, and the acidic organic matter B layer are repeatedly coated five times according to the number of drip irrigation times of the crop, and the weight of each acidic organic matter B layer increases from the inside to the outside after repeated coating. Specifically, the weight ratio of the acidic organic matter B from the inside to the outside during the five repeated coatings is 10:10:15:20:30;

[0034] Among them, the hydrolysis coating material is gum arabic; the acidic organic matter A is citric acid; the saline-alkali improved microbial strains are Bacillus subtilis (effective live bacteria count 100 billion / g) and Bacillus licheniformis (effective live bacteria count 100 billion / g); the sensitive material is a material that dissolves only when the environmental pH is ≥7, specifically acrylic resin No. III; the humate is potassium humate that dissolves at pH 8; the acidic organic matter B is citric acid.

[0035] Example 2

[0036] Provided is a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas. The soil remediation bacterial agent has a granular coating structure, which is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a salt-alkali improving microbial strain layer, a pH-sensitive material layer, a humate protective layer, and an acidic organic matter B layer from the outside to the inside, and the weight ratio of the layers from the outside to the inside is 0.5:25:3:1:0.5:5;

[0037] The sensitive material layer, the humate protective layer and the acidic organic matter B layer are repeatedly coated four times according to the number of drip irrigation times of the crop, and the weight of each acidic organic matter B layer increases from the inside to the outside after repeated coating;

[0038] Among them, the hydrolysis coating material is gelatin; the acidic organic matter A is sulfinic acid; the saline-alkali improving microbial strain is Bacillus amyloliquefaciens; the sensitive material is a material that dissolves only when the environmental pH is ≥7, specifically acrylic resin No. III; the humate is potassium humate that dissolves at pH 8; and the acidic organic matter B is sulfinic acid.

[0039] Example 3

[0040] Provided is a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas. The soil remediation bacterial agent has a granular coating structure, which is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a salt-alkali improving microbial strain layer, a pH-sensitive material layer, a humate protective layer, and an acidic organic matter B layer from the outside to the inside, and the weight ratio of the layers from the outside to the inside is 1.5:35:9:2:1.5:15;

[0041] The sensitive material layer, the humate protective layer and the acidic organic matter B layer are repeatedly coated three times according to the number of drip irrigation times of the crop, and the weight of each acidic organic matter B layer increases from the inside to the outside after repeated coating;

[0042] Among them, the hydrolysis coating material is peach gum; the acidic organic matter A is sulfur carboxylic acid; the salt-alkali improving microbial strain is Bacillus velez; the sensitive material is a material that dissolves only when the environmental pH is ≥7, specifically acrylic resin No. III; the humate is potassium humate that dissolves when the pH is 8; the acidic organic matter B is sulfur carboxylic acid.

[0043] Example 4

[0044] A production method is provided for the soil remediation bacterial agent of Example 1. The production method of the soil remediation bacterial agent for buffering soil salinity and alkali in arid areas comprises the following steps:

[0045] S1. Determine the salinity and water-salt movement capacity of the soil and irrigation water in the site to be remediated. Based on the results, set the proportion of acidic organic matter in each layer to ensure that there is sufficient acidic material to adjust the soil pH value during each drip irrigation.

[0046] Specifically: the soil texture of the site is saline fluvo-aquic soil, with a water-salt movement flux of 10 cm. The pH value of the soil at a depth of 0 to 15 cm is about 8.78, and the pH value of the soil at a depth of 15 to 25 cm is about 8.51. The irrigation water is well water, and its pH value is about 8.41. Wheat is dripped 7 times throughout its growth period, of which the last two times are during the filling and maturity stages. The root system is basically not affected by salt and alkali. Therefore, the soil remediation agent is designed to be released 5 times. According to the alkalinity of the soil plow layer and the distribution of soil alkalinity, the ratio of acidic organic matter B from the inside to the outside is designed to be 10:10:15:20:30;

[0047] S2. Granulate 10.0 parts of acidic organic matter B (citric acid) in a drum granulator to obtain fertilizer granules A. The granulation process should be kept dry to prevent the outer layer of humate from being affected;

[0048] S3. 1.0 part of potassium humate dissolved at a pH of 8.0 is embedded and granulated in the outer layer of the fertilizer granules A in a drum granulator to form a humate protective layer, thereby obtaining fertilizer granules B;

[0049] S4. Place the fertilizer granules B into a coating machine, and then add 1.5 parts of a pH-sensitive material (acrylic resin No. III) that dissolves when the pH is ≥ 7 to coat the outer layer of the fertilizer granules B with the pH-sensitive material to form a pH-sensitive material layer, thereby obtaining fertilizer granules C.

[0050] S5. 10.0 parts of acidic organic matter B is embedded and granulated in the outer layer of the fertilizer granules C to form an acidic organic matter B layer, thereby obtaining fertilizer granules D;

[0051] S6. Repeating the coating process of steps S3 to S5 five times on the outer layer of the fertilizer granule D, wherein the weight of each acidic organic matter B layer increases from the inside to the outside and the outermost layer is a pH-sensitive material layer, thereby obtaining a fertilizer granule E; during these five repeated coating processes, the weight ratio of the acidic organic matter B from the inside to the outside is 10:10:15:20:30;

[0052] S7. The outer layer of the fertilizer granules E is sequentially encapsulated and granulated with a salt-alkali-modifying microbial strain and an acidic organic matter A in a drum granulator at 55-65° C., so as to remove fungal bacteria and excess water while encapsulating, thereby forming a salt-alkali-modifying microbial strain layer and an acidic organic matter A layer, respectively, to obtain fertilizer granules F.

[0053] S8. Place the fertilizer granules F into a coating machine, add 1.0 part of a hydrolyzed coating material (gum arabic), and coat the outer layer of the fertilizer granules F with the hydrolyzed coating material to form a hydrolyzed coating material layer, thereby obtaining fertilizer granules G;

[0054] S9. Place the coated fertilizer particles G into a dryer and dry them at 55-65° C. for 120-240 minutes, and cool them to obtain a repair bacterial agent for buffering soil salinity and alkali in arid areas.

[0055] Example 5

[0056] The soil remediation agent of Example 1 was applied to moderately saline-alkali soil in Xiaohekou Village, Jinta County, Gansu Province. Spring wheat (Ningchun 4 variety) was used as the test crop. The pH value of the soil in the test site was about 8.78, and the total salt content was about 5.07 g / kg.

[0057] The application method of the above-mentioned soil salinity-buffering remediation agent in arid areas is as follows: according to the thickness of the tillage layer of wheat (5-15 cm), the remediation agent of Example 1 is applied in holes in the rhizosphere soil with a tillage layer thickness of ±5 cm around the drip line of drip irrigation to ensure that it takes effect around the rhizosphere of the crop; wherein the dosage of the remediation agent is 300 kg / mu.

[0058] Experimental Design:

[0059] Control group: conventional fertilization only (CK);

[0060] Experimental group 1: conventional fertilization (CK) + 300 kg common soil remediation agent / mu;

[0061] Experimental group 2: conventional fertilization (CK) + 300 kg slow-release soil remediation agent / mu;

[0062] Experimental group 3: conventional fertilization (CK) + 300 kg of soil remediation agent of Example 1 / mu;

[0063] Among them, the total amount of conventional fertilizer is 65kg, and conventional fertilizer (CK) includes: 24-29kg of urea, 10kg of monoammonium phosphate, 10kg of potassium sulfate, 17kg of magnesium sulfate, and 2.5kg of micronutrient fertilizer, which is equivalent to 12.7kg of pure nitrogen, 4.3kg of pure phosphorus, and 5kg of pure potassium;

[0064] Ordinary soil remediation bacteria refers to: traditional soil alkalinity relief bacteria materials, which are products made of simple acidic organic matter into raw particles;

[0065] Slow-release soil remediation bacteria agent refers to: traditional remediation bacteria agent material that alleviates soil alkalinity, which is a remediation bacteria agent that uses slow-release materials.

[0066] Experimental method: The experiment adopted a randomized block arrangement design. Under the wheat shallow buried drip irrigation technology mode, a total of 4 treatment groups (including the control group and experimental groups 1 to 3) were designed, and each treatment group was repeated 3 times. The area of each plot was 40m 2 (20m long and 2m wide), isolation ridges are set up between cells, and each cell has a single irrigation and single row.

[0067] The effects of different treatments on the soil pH of the wheat plough layer were recorded as shown in Table 1; the effects of different treatments on the growth period of wheat were recorded as shown in Table 2; and the effects of different treatments on wheat yield were recorded as shown in Table 3:

[0068] Table 1 shows the effects of different treatments on soil pH during the wheat growth period.

[0069]

[0070] As can be seen from Table 1, compared with the control group, experimental groups 1 and 3 can effectively reduce the pH value of the plow layer soil in the "seedling emergence stage" to ensure the normal emergence of wheat. However, the acidic substances in experimental group 1 were consumed at the beginning of the tillering stage, and the pH rose to the stress critical point, affecting the formation of wheat ears. The slow-release acidic substances in experimental group 2 could not effectively reduce the pH value of the soil plow layer under the condition of high alkalinity in the soil at the seedling stage, which would affect the emergence of wheat. If the amount of slow-release acidic substances in experimental group 2 was increased, it would lead to acidification of the soil plow layer in the later stage, which would cause stress to wheat.

[0071] The soil remediation agent used in test group 3 was able to stably maintain a healthy pH in the wheat plow layer. Compared to traditional soil alkaline remediation agents, the soil remediation agent of the present invention has a better application effect and can significantly improve soil pH.

[0072] Table 2 shows the growth period of wheat after different treatments. Unit: day / month, day

[0073]

[0074] As can be seen from Table 2, compared with the control group, the "jointing period" and "heading period" of wheat in the experimental group 1 were delayed by 1 day respectively, the "grain filling period" was advanced by 2 days, the "maturity period" was delayed by 3 days, and the "growth period" was 103 days, which was 3 days longer than that of the control group.

[0075] Compared with the control group, the jointing stage and heading stage of wheat in experimental group 3 were delayed by 1 and 2 days respectively, the filling stage was advanced by 3 days, the maturity stage was delayed by 6 days, and the growth period was 106 days, which was 6 days longer than that of the control group.

[0076] The performance of experimental group 1 and experimental group 2 in each growth stage was consistent, with no significant difference.

[0077] Table 3 shows the statistical results of wheat yield after different treatments

[0078]

[0079] As can be seen from Table 3, the plant height of wheat in experimental group 3 after treatment was the highest, which was 76.4 cm, and the plant height of wheat in the control group was the lowest, which was 64.2 cm;

[0080] The wheat spike length in experimental group 3 was the longest, at 7.9 cm, followed by experimental group 2, at 7.8 cm, and the shortest in the control group, at 7.1 cm;

[0081] The number of spikelets in the wheat of experimental group 3 was the largest, at 10.6, while the number of spikelets in the wheat of the control group was the smallest, at 10.1, which was an increase of 0.5 compared with the control;

[0082] The wheat in experimental group 3 had the largest number of grains per ear, 27.9 grains, while the wheat in the control group had the smallest number of grains per ear, 23.4 grains, an increase of 4.5 grains compared to the control;

[0083] Due to the stress caused by saline-alkali, the emergence rate and ear formation rate decreased, and the difference in the number of ears per mu among the four treatments was more obvious. Experimental groups 1 to 3 were significantly higher than the control group. However, since experimental group 2 was a slow-release soil remediation agent, it was unable to quickly lower the soil pH at the emergence stage. Experimental group 1 consumed all the acidic substances at the ear formation stage and could not effectively improve the soil pH. Therefore, the number of ears per mu and yield of experimental groups 1 to 3 were as follows: experimental group 3>experimental group 1>experimental group 2.

[0084] It can be seen that the soil remediation bacterial agent of the present invention has better application effect than traditional soil alkaline remediation bacterial agent materials, can significantly improve soil pH and increase crop yield.

[0085] The above preferred embodiments of the present invention are only used to explain the present invention and are not used to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A remediation bacterial agent for buffering soil salinity and alkali in arid areas, characterized in that: The repair bacterial agent has a granular coating structure, which is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter A layer, a saline-alkali modified microbial strain layer, a pH sensitive material layer, a humate protective layer, and an acidic organic matter B layer. The saline-alkali modified microbial strain layer, the acidic organic matter A layer and the hydrolysis coating material layer are coated layer by layer from the inside to the outside; The acidic organic matter B layer, the humate protective layer, and the pH sensitive material layer are coated layer by layer from the inside to the outside, and the acidic organic matter B layer, the humate protective layer, and the pH sensitive material layer are repeatedly coated according to the number of drip irrigation times of the crop. After repeated coating, the outermost layer is the pH sensitive material layer, and the number of repeated coatings is positively correlated with the number of drip irrigation times; The saline-alkali modified microbial strain layer is coated on the outermost pH sensitive material layer; the sensitive material is selected from a material that dissolves when the environmental pH is ≥ 7, and the humate is selected from a humate that dissolves when the pH is ≥ 8; The weight ratios of the hydrolysis coating material layer, the acidic organic matter A layer, the saline-alkali modified microbial strain layer, the pH sensitive material layer, the humate protective layer and the acidic organic matter B layer are (0.5-1.5): (25-35): (3-9): (1-2): (0.5-1.5): (5-15).

2. The remediation bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The hydrolysis coating material is selected from one or more of gum arabic, gelatin and peach gum.

3. The remediation bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The acidic organic matter A and B are selected from one or more of citric acid, sulfinic acid and thiocarboxylic acid.

4. The remediation bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The saline-alkali improving microbial strain is Bacillus, which is selected from one or more of Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens and Bacillus velez.

5. The remediation bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The sensitive material is acrylic resin No. III.

6. The remediation bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The sensitive material layer, the humate protective layer and the acidic organic matter B layer are repeatedly coated 3 to 5 times according to the number of drip irrigation times of the crops, and the weight of each acidic organic matter B layer increases from the inside to the outside after repeated coating.

7. An application method of a repair bacterial agent for buffering soil salinity and alkali in arid areas, characterized in that: According to the thickness of the tillage layer of different crops, the remediation bacterial agent according to any one of claims 1 to 6 is applied in holes in the rhizosphere soil with a tillage layer thickness of ±5 cm around the drip line of drip irrigation to ensure that it takes effect around the rhizosphere of the crop; wherein the application amount of the remediation bacterial agent is 150 to 450 kg / mu.

8. The application method of the repair bacterial agent for buffering soil salinity and alkali in arid areas according to claim 7, characterized in that: The crops include wheat, barley, sorghum, corn, soybeans, cotton, sugar beets, sweet potatoes, potatoes, tomatoes, and peppers; Among them, the tillage layer thickness of wheat, barley, sorghum, corn and soybean is 5.0-15.0 cm; the tillage layer thickness of cotton, beets, sweet potatoes and potatoes is 15.0-25.0 cm; and the tillage layer thickness of tomatoes and peppers is 25.0-40.0 cm.

Images