Remediation fungicide for buffering soil salt and alkali in arid region and production and application method thereof

Abstract

The invention discloses a remediation microbial agent for buffering soil salt and alkali in an arid region and a production and application method of the remediation microbial agent. The saline-alkali soil conditioner is obtained by granulating and coating a hydrolysis coating material layer, an acidic organic matter layer A, a saline-alkali improvement microbial strain layer, a pH sensitive material layer, a humate protective layer and an acidic organic matter layer B layer from outside to inside layer by layer, and the weight ratio of the layers from outside to 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 times of drip irrigation of crops, and the number of times of repeated coating is in positive correlation with the number of times of drip irrigation; the sensitive material is a material which is only dissolved when the environment pH is greater than or equal to 7, and the humate is a humate which is dissolved when the pH is greater than or equal to 8. The remediation microbial agent solves the problem that a traditional saline alkali soil remediation microbial agent is poor in application effect.

Description

Technical Field

[0001] The 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 northern arid region is an area with less water resources, and saline-alkali soil has the characteristic of water-salt movement of "alkali follows water". "Water-salt movement" refers to the movement of water and the salt it carries in the medium. The water-salt movement system is composed of the surface water subsystem, the groundwater subsystem and the vegetation subsystem. The salt in the soil moves with the water. During the evaporation process, the salt dissolved in the water is transported to the surface of the soil with the water. When the water evaporates, the salt will accumulate in the surface soil; after drip irrigation, these surface salts are dissolved by fresh water and then infiltrate into the deep soil. Over a period of time, if the amount of soil water evaporates greatly and the salt it carries accumulates to the surface in large quantities, the soil will be in a state of salt accumulation, which is very unfavorable for agricultural production and vegetation growth in saline-alkali land. 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 soil, the stress of alkaline solution on crops is faster than salt stress. Therefore, while suppressing salt with water, 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 reduced by drip irrigation of acidic liquid, 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 soil remediation bacteria that can release acidic substances under drip irrigation conditions at key growth nodes of crops.

[0003] At present, traditional remediation bacterial materials 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-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 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, in view of the problem that traditional soil alkalinity repair bacteria agent materials have poor application effects, which solves the problems faced by traditional soil alkalinity repair bacteria agent materials.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions: The invention provides a repairing bacterial agent for buffering soil salinity and alkali in arid areas. The repairing bacterial agent is a particle 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 water for crops, and the number of repeated coatings is positively correlated with the number of drip irrigation water; 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 (the humates are all alkaline soluble, and the alkaline solubility nodes of humates with different moduli are different).

[0006] 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. The initial release of acidic substances and beneficial microorganisms improves the crop rhizosphere environment, ensures normal crop emergence, and timely releases 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 release times, thereby solving the problem of poor application effect of traditional saline-alkali soil remediation bacterial agents.

[0007] 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.

[0008] 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 thiocarboxylic acid.

[0009] Furthermore, a repairing 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.

[0010] Furthermore, a repair bacterial agent for buffering soil salinity and alkali in arid areas: the sensitive material is acrylic resin No. III.

[0011] Furthermore, a repairing 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 times of crops, and after repeated coating, the weight of each acidic organic matter B layer increases from the inside to the outside.

[0012] 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: S1. Determination of the salinity and water-salt movement capacity of the soil and irrigation water in the land to be repaired. According to the test results, the proportion of acidic organic matter in each layer is set to ensure that there is enough acidic substance to adjust the soil pH value in each drip irrigation. S2. Granulate the acidic organic matter B to obtain fertilizer granules A, and keep them dry during granulation to prevent the outer humate protective layer from being affected; 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; S4, coating the outer layer of the fertilizer particle B with a pH sensitive material to form a pH sensitive material layer, thereby obtaining a fertilizer particle C; S5, coating the outer layer of the fertilizer particle C with acidic organic matter B to form an acidic organic matter B layer, thereby obtaining fertilizer particles D; S6, repeating 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 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; S7, sequentially coating the outer layer of the fertilizer granule E with a salt-alkali-improving microbial strain and an acidic organic matter A to form a salt-alkali-improving microbial strain layer and an acidic organic matter A layer, respectively, thereby obtaining a fertilizer granule F; 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; S9, drying and cooling the fertilizer particles G to obtain a repairing bacterial agent for buffering soil salinity and alkali in arid areas.

[0013] Furthermore, a method for producing a repairing 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 min.

[0014] The present invention also provides an application method of a repair bacteria 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 repair bacteria 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 root zone of the crop; wherein the application amount of the repair bacteria agent is 150-450 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 each layer of acidic organic matter can buffer the pH of the tillage layer to below 7.

[0015] Furthermore, a method for applying a repairing bacterial agent for buffering soil salinity and alkali in arid areas: the crops include but are not limited to wheat, barley, sorghum, corn, soybean, cotton, sugar beet, sweet potato, potato, tomato, and pepper; wherein the tillage layer thickness of wheat, barley, sorghum, corn, and soybean is 5.0 to 15.0 cm, the tillage layer thickness of cotton, sugar beet, sweet potato, and potato is 15.0 to 25.0 cm, and the tillage layer thickness of tomato and pepper is 25.0 to 40.0 cm.

[0016] Beneficial effects of the present invention: (1) The soil salinity and alkali buffering bacteria agent provided by the present invention in arid areas can release sufficient acidic organic matter at key drip irrigation nodes in different growth periods of crops, rapidly reduce the soil pH value, and stop releasing when the soil pH value is adjusted to neutral. The soil remediation bacteria agent of the present invention is aimed at the shallow buried drip irrigation crop areas in northern arid areas, where water resources are scarce, saline-alkali soil hinders alkali from flowing with water, and water removes salt and retains water and salt movement. The remediation bacteria agent is applied to the tillage layer and releases acidic substances through controlled release at the key drip irrigation stage of crop growth to neutralize soil alkalinity and protect crop roots.

[0017] (2) The remediation bacteria 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 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 in the remediation bacteria agent particles are protected in the soil and will not be released.

[0018] (3) The characteristics of humates are that their solid chemical properties are stable. After dissolving in alkaline solutions, they form alkaline organic solutions. Therefore, a layer of humates 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. There is no residue, which prevents secondary pollution. It also increases soil organic matter and further improves the soil environment. Under the combined action of microorganisms and acidic organic matter, the soil texture is gradually improved, and the soil ecological environment is improved. Without affecting the normal production of crops, the problem of soil salinity can be fundamentally solved after multiple applications. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] This embodiment 1 provides a repair bacterial agent for buffering soil salinity and alkali in arid areas for moderate saline-alkali soil in Xiaohekou Village, Jinta County, Gansu Province (wheat is planted after repair). The soil repair bacterial agent is 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 improved 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 1:30:6:1.5:1:10; The sensitive material layer, the humate protective layer and the acidic organic matter B layer are repeatedly coated 5 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 in the 5 repeated coatings is 10:10:15:20:30; Among them, the hydrolysis coating material is gum arabic; the acidic organic matter A is citric acid; the salt-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.

[0022] Example 2

[0023] Provided is a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas. The soil remediation bacterial agent is 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 0.5:25:3:1:0.5:5; The sensitive material layer, the humate protective layer and the acidic organic matter B layer are repeatedly coated 4 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; Among them, the hydrolysis coating material is gelatin; the acidic organic matter A is sulfinic acid; the salt-alkali improved microbial strain is Bacillus amyloliquefaciens; the sensitive material is a material that dissolves 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 sulfinic acid.

[0024] Example 3

[0025] Provided is a soil remediation bacterial agent for buffering soil salinity and alkali in arid areas. The soil remediation bacterial agent is 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 1.5:35:9:2:1.5:15; 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; 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 at pH 8; the acidic organic matter B is sulfur carboxylic acid.

[0026] Example 4

[0027] A production method is provided for the soil remediation bacterial agent of the above-mentioned embodiment 1. The production method of the soil remediation bacterial agent for buffering soil salinity and alkali in arid areas comprises the following steps: S1. Determination of the salinity and water-salt movement capacity of the soil and irrigation water in the land to be repaired. According to the test results, the proportion of acidic organic matter in each layer is set to ensure that there is enough acidic substance to adjust the soil pH value in each drip irrigation. Specifically, the soil texture of the area is salinized tidal soil, and the water-salt movement flux is 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 during the whole growth period, of which the last two times are during the filling period and the maturity period. The root system is basically not affected by salt and alkali. Therefore, the soil remediation bacterial 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 inside to outside is designed to be 10:10:15:20:30; S2. Granulate 10.0 parts of acidic organic matter B (citric acid) in a drum granulator to obtain fertilizer granules A, and keep them dry during the granulation process to prevent the humate on the outer layer from being affected; S3, embedding and granulating 1.0 part of potassium humate dissolved at pH 8.0 in the outer layer of the fertilizer granules A in a drum granulator to form a humate protective layer, thereby obtaining fertilizer granules B; S4, putting the fertilizer granules B into a coating machine, and then adding 1.5 parts of a pH sensitive material (acrylic resin No. III) which dissolves when the pH is ≥ 7, so as 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; S5, embedding and granulating 10.0 parts of acidic organic matter B in the outer layer of the fertilizer granules C to form an acidic organic matter B layer, thereby obtaining fertilizer granules D; S6, repeating the coating process of steps S3 to S5 for 5 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 after repeated coating and the outermost layer is a pH sensitive material layer, thereby obtaining a fertilizer granule E; during the 5 repeated coating processes, the weight ratio of the acidic organic matter B from the inside to the outside is 10:10:15:20:30; S7, in the outer layer of the fertilizer granules E, the salt-alkali modified microorganism strains and the acidic organic matter A are sequentially embedded and granulated in a drum granulator at 55-65° C., so as to remove fungal bacteria and excess water while embedding, and form a salt-alkali modified microorganism strain layer and an acidic organic matter A layer, respectively, to obtain fertilizer granules F; S8, putting the fertilizer granules F into a coating machine, adding 1.0 part of a hydrolyzed coating material (gum arabic), and coating 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; S9. Put the coated fertilizer particles G into a dryer and dry them at 55-65° C. for 120-240 min, and cool them to obtain a repairing bacterial agent for buffering soil salinity and alkali in arid areas.

[0028] Example 5

[0029] The soil remediation bacterial agent of Example 1 was applied to the moderately saline-alkali soil in Xiaohekou Village, Jinta County, Gansu Province, and spring wheat (variety Ningchun 4) was used as an experiment. 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; The application method of the above-mentioned repair bacteria agent for buffering soil salinity in arid areas is as follows: according to the thickness of the tillage layer of wheat (5-15 cm), the repair bacteria agent of Example 1 is applied in holes in the rhizosphere soil of the tillage layer thickness ±5 cm around the drip line of drip irrigation to ensure that it takes effect around the rhizosphere of the crop; wherein the amount of the repair bacteria agent used is 300 kg / mu.

[0030] Experimental Design:

[0031] Control group: conventional fertilization only (CK); Experimental group 1: conventional fertilization (CK) + 300 kg common soil remediation bacteria agent / mu; Experimental group 2: conventional fertilization (CK) + 300 kg slow-release soil remediation agent / mu; Experimental group 3: conventional fertilization (CK) + 300 kg of soil remediation agent of Example 1 / mu; Among them, the total amount of conventional fertilizer is 65kg, and conventional fertilizer (CK) includes: 24-29kg urea, 10kg monoammonium phosphate, 10kg potassium sulfate, 17kg magnesium sulfate, 2.5kg micro-fertilizer, equivalent to 12.7kg pure nitrogen, 4.3kg pure phosphorus, and 5kg pure potassium; Ordinary soil remediation bacteria refers to: traditional soil remediation bacteria materials that alleviate soil alkalinity, which are products made of simple acidic organic matter into raw particles; Slow-release soil remediation bacteria agent refers to: traditional remediation bacteria agent materials that alleviate soil alkalinity, which are remediation bacteria agents that use slow-release materials.

[0032] Experimental method: The experiment adopted a randomized block arrangement design. Four treatment groups (including the control group and experimental groups 1 to 3) were designed under the wheat shallow buried drip irrigation technology mode. Each treatment group was repeated three 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.

[0033] The effects of different treatments on the soil pH of the wheat tillage 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: Table 1 shows the effects of different treatments on soil pH during the wheat growth period

[0034] 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 tillage layer soil in the "seedling stage" to ensure the normal emergence of wheat, while 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 tillage layer under the condition of high soil alkalinity in 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 tillage layer in the later stage, causing stress to wheat.

[0035] The test group 3 using the soil remediation bacterial agent of the present invention can stably maintain the pH value of the wheat tillage layer soil in a healthy state. Compared with the traditional soil alkaline remediation bacterial agent material, the soil remediation bacterial agent of the present invention has a better application effect and can significantly improve the soil pH.

[0036] Table 2 shows the growth period of wheat after different treatments. Unit: day / month, day

[0037] 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. Compared with the control group, the "jointing period" and "heading period" of wheat in the experimental group 3 were delayed by 1 and 2 days respectively, the "grain filling period" was advanced by 3 days, the "maturity period" was delayed by 6 days, and the "growth period" was 106 days, which was 6 days longer than that of the control group. The performances of experimental groups 1 and 2 in each growth stage were consistent, with no significant differences.

[0038] Table 3 shows the statistical results of wheat yield after different treatments

[0039] As can be seen from Table 3, the plant height of wheat after treatment in experimental group 3 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; The wheat spike length of experimental group 3 was the longest, which was 7.9 cm, followed by experimental group 2, which was 7.8 cm, and the control group was the shortest, which was 7.1 cm; The number of spikelets of wheat in experimental group 3 was the largest, at 10.6, while the number of spikelets of wheat in the control group was the smallest, at 10.1, which was an increase of 0.5 compared with the control; The number of grains per ear of wheat in experimental group 3 was the highest, at 27.9 grains, while the number of grains per ear of wheat in the control group was the lowest, at 23.4 grains, an increase of 4.5 grains compared to the control; Due to the stress caused by salinity and alkali, the emergence rate and ear formation rate decreased. 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 reduce the soil pH at the emergence stage. The acidic substances in experimental group 1 were completely consumed at the ear formation stage and could not effectively improve the soil pH. Therefore, the number of ears per mu and the yield of experimental groups 1 to 3 were as follows: experimental group 3>experimental group 1>experimental group 2.

[0040] 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, and can significantly improve soil pH and increase crop yield.

[0041] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A repairing bacterial agent for buffering soil salinity and alkali in arid areas, characterized in that: The repair bacterial agent is a particle 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 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); Among them, the sensitive material layer, humate protective layer and acidic organic matter B layer are repeatedly coated according to the number of drip irrigation times of the 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.

2. The repairing 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 repairing 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 repair bacterial agent for buffering soil salinity and alkali in arid areas according to claim 1, characterized in that: The salt-alkali improved microorganism strain is bacillus, which is selected from one or more of bacillus subtilis, bacillus licheniformis, bacillus amyloliquefaciens and bacillus velez.

5. The repairing 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 repairing 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 of the crops, and after repeated coating, the weight of each acidic organic matter B layer increases from the inside to the outside.

7. The method for producing a repairing bacterial agent for buffering soil salinity and alkali in arid areas according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Determination of the salinity and water-salt movement capacity of the soil and irrigation water in the land to be repaired. According to the test results, the proportion of acidic organic matter in each layer is set to ensure that there is enough acidic substance to adjust the soil pH value in each drip irrigation. S2, granulating the acidic organic matter B to obtain fertilizer granules A; 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; S4, coating the outer layer of the fertilizer particle B with a pH sensitive material to form a pH sensitive material layer, thereby obtaining a fertilizer particle C; S5, coating the outer layer of the fertilizer particle C with acidic organic matter B to form an acidic organic matter B layer, thereby obtaining fertilizer particles D; S6, repeating 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 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; S7, sequentially coating the outer layer of the fertilizer granule E with a salt-alkali-improving microbial strain and an acidic organic matter A to form a salt-alkali-improving microbial strain layer and an acidic organic matter A layer, respectively, thereby obtaining a fertilizer granule F; 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; S9, drying and cooling the fertilizer particles G to obtain a repairing bacterial agent for buffering soil salinity and alkali in arid areas.

8. The method for producing a repairing bacterial agent for buffering soil salinity and alkali in arid areas according to claim 7, characterized in that: The drying temperature in step S9 is 55-65° C., and the drying time is 120-240 min.

9. An application method of a repairing 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 repair bacteria agent described in any one of claims 1 to 6 is applied 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 root zone of the crop; wherein the application amount of the repair bacteria agent is 150 to 450 kg / mu.

10. The application method of the repairing bacterial agent for buffering soil salinity and alkali in arid areas according to claim 9, characterized in that: The crops include, but are not limited to, 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, beet, sweet potato and potato is 15.0-25.0 cm, and the tillage layer thickness of tomato and pepper is 25.0-40.0 cm.

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