Microbial soil conditioner for saline-alkali soil

Abstract

The invention discloses a microbial soil conditioner for saline-alkali soil. The microbial soil conditioner is prepared from the following raw materials in parts by mass: 5-20 parts of microbial flora, 60-85 parts of a carrier material, 5-15 parts of a functional additive and 3-8 parts of a water-retaining agent, wherein the microbial flora comprises halotolerant bacteria, phosphate solubilizing bacteria, nitrogen-fixing bacteria and potassium bacteria, and the volume ratio of the halotolerant bacteria to the phosphate solubilizing bacteria to the nitrogen-fixing bacteria to the potassium solubilizing bacteria is (2-4): (1-3): (1-2): (1-2). Wherein the halotolerant bacteria are bacillus subtilis, the phosphate solubilizing bacteria are bacillus megatherium, the nitrogen-fixing bacteria are brown nitrogen-fixing bacteria, and the potassium solubilizing bacteria are bacillus mucilaginosus. The invention relates to the technical field of agricultural soil improvement, in particular to a microbial soil conditioner for saline-alkali soil, which has the advantages of reducing the pH value and salt content of soil, improving the soil structure, promoting the growth of crops and protecting the environment due to the adoption of the technical scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural soil improvement, and particularly relates to a microbial soil conditioner for saline-alkali land. Background Art

[0002] Saline-alkali land is a type of low-yield soil widely distributed globally, and its high pH value and high salt content seriously affect the growth and yield of crops. At present, the methods for improving saline-alkali land mainly include physical improvement, chemical improvement, and biological improvement, etc. Physical improvement methods such as irrigation for salt washing, although with remarkable effects, require a large amount of water resources and are costly; chemical improvement methods such as applying gypsum, sulfur, etc., although can quickly reduce the pH value and salt content of the soil, are prone to cause soil compaction and environmental pollution; biological improvement methods such as planting salt-tolerant plants, applying microbial agents, etc., although having the advantages of ecological environmental protection, have a slow improvement effect and are greatly affected by environmental factors. Therefore, there is an urgent need to develop an efficient, environmentally friendly, and long-lasting method for improving saline-alkali land. Summary of the Invention

[0003] In view of this, embodiments of the present invention hope to provide a microbial soil conditioner for saline-alkali land to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0004] The object of the present invention can be achieved by the following technical measures: A microbial soil conditioner for saline-alkali land, which is composed of the following raw materials in parts by mass:

[0005] Microbial flora 5 - 20 parts, carrier material 60 - 85 parts, functional additive 5 - 15 parts, water-retaining agent 3 - 8 parts;

[0006] Among them, the microbial flora includes salt-tolerant bacteria, phosphorus-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria, and their volume ratio is (2 - 4):(1 - 3):(1 - 2):(1 - 2).

[0007] Among them, the salt-tolerant bacteria is Bacillus subtilis, the phosphorus-solubilizing bacteria is Bacillus megaterium, the nitrogen-fixing bacteria is Azotobacter vinelandii, and the potassium-dissolving bacteria is Bacillus mucilaginosus.

[0008] The object of the present invention can also be achieved by the following technical measures:

[0009] The carrier material is decomposed straw powder, peat soil, and perlite, and is mixed in a weight ratio of (3 - 5):(2 - 4):(1 - 2).

[0010] The object of the present invention can also be achieved by the following technical measures:

[0011] The functional additive is humic acid, sodium alginate and chitosan, and they are mixed in a weight ratio of (2-4):(1-3):(1-2).

[0012] The object of the present invention can also be achieved by the following technical measures:

[0013] The water retaining agent is a graft copolymer of polyacrylamide and humic acid, and its mass ratio is polyacrylamide:humic acid = (7-9):(1-3), and the water absorption ratio is ≥ 300 times / g.

[0014] The object of the present invention can also be achieved by the following technical measures: A microbial soil conditioner for saline-alkali land, and the preparation method of the microbial soil conditioner includes:

[0015] Step 1: Perform high-temperature sterilization treatment on the carrier material, the sterilization temperature is 121 °C, and the sterilization time is 30 minutes;

[0016] Step 2: Inoculate the microbial flora into the liquid medium, and culture it at 30 °C and 180 rpm for 24 hours to obtain a bacterial solution;

[0017] Step 3: Mix the bacterial solution, the carrier material, the functional additive and the water retaining agent evenly, and ferment at 25 °C for 48 hours;

[0018] Step 4: Perform drying treatment on the fermentation product, the drying temperature is 50 °C, dry until the water content is less than 10%, and then pulverize and pass through an 80-mesh sieve to obtain the finished product.

[0019] The object of the present invention can also be achieved by the following technical measures: A microbial soil conditioner for saline-alkali land, and the application method of the microbial soil conditioner includes:

[0020] Spread the conditioner evenly on the surface of the saline-alkali land at a dosage of 200-500 kg / ha, and then plow it into the soil, and the plowing depth is 20-30 cm.

[0021] The object of the present invention can also be achieved by the following technical measures:

[0022] When spreading the conditioner, organic fertilizer can also be applied in combination, and the dosage of the organic fertilizer is 1000-3000 kg / ha.

[0023] The object of the present invention can also be achieved by the following technical measures:

[0024] The viable count of the microbial flora is not less than 1×10^8 CFU / g.

[0025] The object of the present invention can also be achieved by the following technical measures:

[0026] The pH value of the conditioner is 6.0 - 7.0.

[0027] The object of the present invention can also be achieved by the following technical measures:

[0028] The particle size of the water-retaining agent is 1 - 3 mm, and it has a synergistic effect of slowly releasing water and nutrients.

[0029] Due to the adoption of the above technical solutions in the embodiments of the present invention, it has the following advantages:

[0030] I. Reducing the soil pH value and salt content: The salt-tolerant bacteria in the microbial flora can secrete organic acids to neutralize the alkaline substances in the soil, reducing the soil pH value; phosphate-solubilizing bacteria, nitrogen-fixing bacteria and potassium-solubilizing bacteria can decompose nutrients such as phosphorus, nitrogen and potassium in the soil, improving the soil fertility and reducing the salt accumulation at the same time.

[0031] II. Improving the soil structure: The decomposed straw powder and peat soil in the carrier material can increase the organic matter content of the soil, improve the soil aggregate structure and enhance the water and fertilizer retention capacity of the soil; perlite can increase the soil air permeability and promote the root growth.

[0032] III. Promoting the crop growth: The microbial flora can secrete plant growth hormones such as indoleacetic acid and gibberellin to promote the growth and development of crops; humic acid, sodium alginate and chitosan in the functional additives can improve the stress resistance of crops and enhance the adaptability of crops to the saline-alkali environment.

[0033] IV. Ecological and environmental protection: The microbial soil conditioner of the present invention does not contain harmful chemical substances, is pollution-free to the soil and environment, and meets the development requirements of green agriculture.

[0034] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a flow chart of a specific embodiment of the preparation method of the microbial soil conditioner for saline-alkali land of the present invention;

[0037] Figure 2Schematic diagram of numerical comparison for Embodiments 1-3 of the present invention. Detailed implementation manners

[0038] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0039] It should be noted that terms such as "first", "second", "symmetric", "array", etc. are only used for the purpose of distinguishing descriptions and position descriptions, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "symmetric", etc. can explicitly or implicitly include one or more of such features; similarly, when there is no numerical limitation on certain features in the form of words such as "two", "three", etc., it should be noted that such features also explicitly or implicitly include one or more feature quantities;

[0040] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with the drawings of the specification and specific circumstances.

[0041] The embodiments of the present invention will be described in detail below.

[0042] A microbial soil conditioner for saline-alkali land of the present invention is composed of 5-20 parts of microbial flora, 60-85 parts of carrier material, 5-15 parts of functional additive, and 3-8 parts of water-retaining agent; wherein, the microbial flora includes salt-tolerant bacteria, phosphorus-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria, and their volume ratio is (2-4):(1-3):(1-2):(1-2); wherein, the salt-tolerant bacteria is Bacillus subtilis, the phosphorus-solubilizing bacteria is Bacillus megaterium, the nitrogen-fixing bacteria is Azotobacter vinelandii, and the potassium-dissolving bacteria is Bacillus mucilaginosus.

[0043] The carrier material is decomposed straw powder, peat soil, and perlite, and is mixed in a weight ratio of (3-5):(2-4):(1-2); the functional additive is humic acid, sodium alginate, and chitosan, and is mixed in a weight ratio of (2-4):(1-3):(1-2); the water-retaining agent is a graft copolymer of polyacrylamide and humic acid, and its mass ratio is polyacrylamide:humic acid = (7-9):(1-3), and the water absorption ratio ≥ 300 times / g.

[0044] As Figure 1 shown Figure 1 is a microbial soil conditioner for saline-alkali land according to the present invention. The preparation method of the microbial soil conditioner includes:

[0045] (1) Subject the carrier material to high-temperature sterilization treatment at a sterilization temperature of 121 °C for 30 minutes;

[0046] (2) Inoculate the microbial flora into a liquid medium and culture it at 30 °C and 180 rpm for 24 hours to obtain a bacterial solution;

[0047] (3) Mix the bacterial solution evenly with the carrier material, functional additive, and water-retaining agent, and ferment at 25 °C for 48 hours;

[0048] (4) Dry the fermentation product at a drying temperature of 50 °C until the moisture content is lower than 10%, and then crush it through an 80-mesh sieve to obtain the finished product.

[0049] A microbial soil conditioner for saline-alkali land. The application method of the microbial soil conditioner includes:

[0050] First, evenly spread the conditioner on the surface of the saline-alkali land at a dosage of 200 - 500 kg / ha, and then plow it into the soil to a depth of 20 - 30 cm. When spreading the conditioner, organic fertilizer can also be applied in combination. The dosage of the organic fertilizer is 1000 - 3000 kg / ha. The viable count of the microbial flora is not less than 1×10^8 CFU / g, the pH value of the conditioner is 6.0 - 7.0, the particle size of the water-retaining agent is 1 - 3 mm, and it has a synergistic effect of slowly releasing water and nutrients.

[0051] The following are several specific examples of applying the present invention

[0052] Example 1

[0053] In specific Example 1 of applying the present invention, the preparation method of the microbial soil conditioner includes the following steps:

[0054] (1) Selection of raw material composition: 10 parts of microbial flora, including salt-tolerant bacteria, phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-solubilizing bacteria, and the volume ratio is 3:2:1:1;

[0055] 75 parts of carrier material, including decomposed straw powder, peat soil, and perlite, and the weight ratio is 4:3:1;

[0056] 10 parts of functional additive, including humic acid, sodium alginate, and chitosan, and the weight ratio is 3:2:1;

[0057] 5 parts of water-retaining agent, including polyacrylamide.

[0058] (2) Preparation method: The carrier material is subjected to high-temperature sterilization at a sterilization temperature of 121 °C and a sterilization time of 30 minutes;

[0059] The microbial flora is inoculated into a liquid medium and cultured at 30 °C and 180 rpm for 24 hours to obtain a bacterial solution;

[0060] The bacterial solution is mixed evenly with the carrier material, functional additives and water retention agent, and fermented at 25 °C for 48 hours;

[0061] The fermentation product is dried at a drying temperature of 50 °C until the moisture content is lower than 10%, and then pulverized through an 80-mesh sieve to obtain the finished product.

[0062] (3) Application method: The conditioner is evenly spread on the surface of moderately saline-alkali soil at a dosage of 300 kg / ha, and then plowed into the soil to a depth of 25 cm.

[0063] (4) Application effect: Three months after applying the conditioner, the pH value of the soil drops from 8.5 to 7.2, the salt content drops from 0.5% to 0.2%, and the yield of corn increases by 25%.

[0064] Example 2

[0065] In the specific Example 2 of applying the present invention, the preparation method of the microbial soil conditioner includes the following steps:

[0066] (1) Selection of raw material composition: 15 parts of microbial flora, including salt-tolerant bacteria, phosphorus-solubilizing bacteria, nitrogen-fixing bacteria and potassium-releasing bacteria with a volume ratio of 4:3:2:2;

[0067] 70 parts of carrier material, including decomposed straw powder, peat soil and perlite with a weight ratio of 5:4:2;

[0068] 12 parts of functional additives, including humic acid, sodium alginate and chitosan with a weight ratio of 4:3:2;

[0069] 6 parts of water retention agent, including polyacrylamide.

[0070] (2) Preparation method: The carrier material is subjected to high-temperature sterilization at a sterilization temperature of 121 °C and a sterilization time of 30 minutes;

[0071] The microbial flora is inoculated into a liquid medium and cultured at 30 °C and 180 rpm for 24 hours to obtain a bacterial solution;

[0072] The bacterial solution is mixed evenly with the carrier material, functional additives and water retention agent, and fermented at 25 °C for 48 hours;

[0073] The fermentation product is dried at a temperature of 50°C until the moisture content is lower than 10%, and then pulverized and sieved through a 80-mesh sieve to obtain the finished product.

[0074] (3) Application method: The conditioner is evenly spread on the surface of the severely saline-alkali land at a dosage of 400 kg / ha, and then plowed into the soil to a depth of 30 cm.

[0075] (4) Application effect: After 6 months of applying the conditioner, the pH value of the soil drops from 9.0 to 7.5, the salt content drops from 0.8% to 0.3%, and the wheat yield increases by 30%.

[0076] Example 3

[0077] In the specific Example 3 of applying the present invention, the preparation method of the microbial soil conditioner includes the following steps:

[0078] (1) Selection of raw material composition: 8 parts of microbial flora, including salt-tolerant bacteria, phosphorus-solubilizing bacteria, nitrogen-fixing bacteria and potassium-dissolving bacteria with a volume ratio of 2:1:1:1;

[0079] 80 parts of carrier material, including decomposed straw powder, peat soil and perlite with a weight ratio of 3:2:1;

[0080] 8 parts of functional additive, including humic acid, sodium alginate and chitosan with a weight ratio of 2:1:1;

[0081] 4 parts of water-retaining agent, including polyacrylamide.

[0082] (2) Preparation method: The carrier material is subjected to high-temperature sterilization at a temperature of 121°C for 30 minutes;

[0083] The microbial flora is inoculated into a liquid medium and cultured at 30°C and 180 rpm for 24 hours to obtain a bacterial solution;

[0084] The bacterial solution is mixed evenly with the carrier material, functional additive and water-retaining agent and fermented at 25°C for 48 hours;

[0085] The fermentation product is dried at a temperature of 50°C until the moisture content is lower than 10%, and then pulverized and sieved through a 80-mesh sieve to obtain the finished product.

[0086] (3) Application method: The conditioner is evenly spread on the surface of the slightly saline-alkali land at a dosage of 250 kg / ha, and then plowed into the soil to a depth of 20 cm.

[0087] (4) Application effect: After 1 month of applying the conditioner, the pH value of the soil drops from 8.0 to 7.0, the salt content drops from 0.3% to 0.1%, and the rice yield increases by 20%.

[0088] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions thereof, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A microbial soil conditioner for saline-alkali land, characterized in that, The microbial soil conditioner is composed of the following raw materials in parts by mass: 5 - 20 parts of microbial flora, 60 - 85 parts of carrier material, 5 - 15 parts of functional additive, and 3 - 8 parts of water-retaining agent; Among them, the microbial flora includes salt-tolerant bacteria, phosphorus-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-releasing bacteria, and their volume ratio is (2 - 4):(1 - 3):(1 - 2):(1 - 2). Among them, the salt-tolerant bacteria is Bacillus subtilis, the phosphorus-solubilizing bacteria is Bacillus megaterium, the nitrogen-fixing bacteria is Azotobacter vinelandii, and the potassium-releasing bacteria is Bacillus mucilaginosus.

2. The microbial soil conditioner for saline-alkali land according to claim 1, characterized in that: The carrier material is decomposed straw powder, peat soil, and perlite, and is mixed in a weight ratio of (3 - 5):(2 - 4):(1 - 2).

3. The microbial soil conditioner for saline-alkali land according to claim 1, characterized in that: The functional additive is humic acid, sodium alginate, and chitosan, and is mixed in a weight ratio of (2 - 4):(1 - 3):(1 - 2).

4. The microbial soil conditioner for saline-alkali land according to claim 1, wherein: The water-retaining agent is a graft copolymer of polyacrylamide and humic acid, and its mass ratio is polyacrylamide:humic acid = (7 - 9):(1 - 3), and the water absorption ratio is ≥ 300 times / g.

5. A method for preparing the microbial soil conditioner according to any one of claims 1-4, characterized in that, The preparation method of the microbial soil conditioner includes: Step 1: Subject the carrier material to high-temperature sterilization treatment, with a sterilization temperature of 121 °C and a sterilization time of 30 minutes; Step 2: Inoculate the microbial flora into a liquid medium and culture it at 30 °C and 180 rpm for 24 hours to obtain a bacterial liquid; Step 3: Mix the bacterial liquid evenly with the carrier material, functional additive, and water-retaining agent, and ferment at 25 °C for 48 hours; Step 4: Dry the fermentation product, with a drying temperature of 50 °C, dry until the moisture content is less than 10%, and then crush it through an 80-mesh sieve to obtain the finished product.

6. A method for applying a microbial soil conditioner as described in any one of claims 1 - 4, characterized in that: Spread the conditioner evenly on the surface of the saline-alkali land at a dosage of 200 - 500 kg / ha, and then plow it into the soil, with a plowing depth of 20 - 30 cm.

7. The application method of the microbial soil conditioner according to claim 6, characterized in that: When spreading the conditioner, organic fertilizer can also be applied in combination, and the dosage of the organic fertilizer is 1000 - 3000 kg / ha.

8. The microbial soil conditioner for saline-alkali land according to claim 1, characterized in that: The viable count of the microbial flora is not less than 1×10^8 CFU / g.

9. A microbial soil conditioner for saline-alkali land according to claim 1, characterized in that: The pH value of the conditioner is 6.0 - 7.

0.

10. A microbial soil conditioner for saline-alkali land according to claim 1, characterized in that: The particle size of the water-retaining agent is 1 - 3 mm, and it has a synergistic effect of slowly releasing water and nutrients.

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