Organic fertilizer for promoting plant growth and soil improvement and preparation method thereof

Abstract

The present invention discloses an organic fertilizer for promoting plant growth and soil improvement and a preparation method thereof, and belongs to the technical field of organic fertilizers. The organic fertilizer comprises the following raw materials: decomposed chicken manure, soybean meal, straw powder, sweet potato vine, humic acid, composite microbial agent, rosmarinic acid, and a stimulant. The composite microbial agent is composed of Actinomyces millefolius, Pseudomonas stutzeri, and Bacillus velezensis, and the stimulant is a glucosamine sulfate solution. Rosmarinic acid, glucosamine sulfate solution, and composite microbial agent are added to the organic fertilizer of the present invention. These three components are compounded with straw, chicken manure, etc. to form an organic fertilizer. The synergistic effect of multiple substances promotes the growth of cabbage and increases yield on the one hand; on the other hand, it significantly improves the physical and chemical properties of the soil.

Description

Technical Field

[0001] The invention belongs to the technical field of organic fertilizers, and in particular relates to an organic fertilizer for promoting plant growth and soil improvement and a preparation method thereof. Background Art

[0002] Chinese cabbage, a Brassica genus in the cruciferous family, is one of the most widely cultivated vegetables in my country. Traditionally, cabbage production relies heavily on chemical fertilizers. The long-term, continuous, and high-volume application of chemical fertilizers has led to numerous problems, including reduced cabbage quality, soil degradation, and environmental pollution.

[0003] As a crucial factor in agricultural production, nitrogen fertilizer plays a key role in increasing crop yields and farmers' incomes. However, excessive nitrogen application remains a common problem in Chinese agricultural production. This leads to soil compaction and inefficient nutrient utilization, which are detrimental to the sustainable and healthy development of vegetable production. It also causes significant nitrate accumulation in the soil and crops, which is detrimental to human health. Organic fertilizer, rich in humus and microorganisms, can restore soil aggregate structure and enhance water and fertilizer retention. Furthermore, organic fertilizer slowly releases nutrients, reducing nitrate accumulation and improving cabbage quality and safety, meeting consumer demand for green, organic agricultural products. This has led to growing interest in bio-organic fertilizers as a potential alternative to traditional chemical fertilizers. Made from natural materials such as plant and animal waste, bio-organic fertilizers are significantly less harmful to the environment. Soil is the foundation of agricultural production, and protecting soil health and enhancing soil fertility are crucial to agricultural production.

[0004] Therefore, how to reasonably apply bio-organic fertilizer to replace nitrogen fertilizer in Chinese cabbage production is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide an organic fertilizer for promoting plant growth and soil improvement, which effectively promotes cabbage growth, increases yield, and improves soil physical and chemical properties.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0007] An organic fertilizer for promoting plant growth and improving soil comprises the following raw materials in parts by weight: 35-40 parts of decomposed chicken manure, 15-20 parts of soybean meal, 10-20 parts of straw powder, 10-14 parts of sweet potato vines, 8-10 parts of humic acid, 5-8 parts of a composite microbial agent, 2-3 parts of rosmarinic acid, and 1-3 parts of a stimulant.

[0008] Furthermore, the stimulant is a glucosamine sulfate solution with a concentration of 5 mg / L.

[0009] Furthermore, the composite microbial agent is composed of Actinomyces chibaensis, Pseudomonas stutzeri, and Bacillus velezensis in a mass ratio of 1:1:1.

[0010] Furthermore, the chiba actinomycetes were purchased from the General Microbiology Center of the China Culture Collection Administration Committee, with the deposit number CGMCC4.6236 and the original deposit date of March 9, 2008; the Pseudomonas stutzeri were purchased from the China Center for Type Culture Collection, with the deposit number CCTCC AB 2012149 and the original deposit date of June 11, 2012; and the Velez Bacillus was purchased from the China Center for Type Culture Collection, with the deposit number CCTCC AB2012100 and the original deposit date of May 14, 2012.

[0011] Furthermore, the preparation method of the composite microbial agent is:

[0012] Chiba Madura Actinomyces, Pseudomonas stutzeri, and Bacillus velezensis were cultured in seed culture medium at 28°C, 30°C, and 35°C for 48 h, respectively, and inoculated into LB culture medium at a 5% inoculum volume, and cultured until the bacterial concentration OD 600 =3.0 to obtain three bacterial liquids, which were evenly mixed in a mass ratio of 1:1:1, and freeze-dried into freeze-dried powder to obtain a composite microbial agent.

[0013] Furthermore, the sweet potato vines are dried sweet potato vines, which are crushed and passed through a 60-mesh sieve.

[0014] A method for preparing an organic fertilizer for promoting plant growth and improving soil is prepared by the following steps:

[0015] (1) Raw material mixing:

[0016] Mix the decomposed chicken manure, soybean meal, straw powder and sweet potato vines evenly, then add humic acid, sprinkle it in while stirring, and stir for 20 minutes.

[0017] Mix for 10 minutes until uniform, then add compound microbial agent, rosmarinic acid and stimulant and stir until uniform;

[0018] (2) Regulating moisture and fermentation:

[0019] The mixture obtained in step (1) is adjusted to a moisture content of 45-55%, and piled into a fermentation pile 1-1.5 meters high, covered with a breathable film, and fermented for two weeks, during which the pile is turned over every three days;

[0020] (3) Granulation and drying:

[0021] The fermented material in step (2) is aired to a moisture content of 18-20%, granulated using a disc granulator to control the particle size to 3-5 mm, and then dried using a dryer to a moisture content of ≤10%, and naturally cooled to room temperature to obtain the final product, organic fertilizer granules.

[0022] Furthermore, the organic fertilizer of the present invention is used in cabbage planting.

[0023] The raw materials used in the present invention are all commercially available.

[0024] The organic fertilizer of the present invention is added with a composite microbial agent, which is composed of Actinomyces millefolium, Pseudomonas stutzeri and Bacillus veleznerii. Pseudomonas stutzeri secretes organic acid and phosphatase to convert insoluble phosphorus in the soil into soluble phosphorus for plant absorption, induces systemic resistance, activates the plant immune system and enhances disease resistance; Bacillus veleznerii secretes growth-promoting substances and produces hormones such as indoleacetic acid and gibberellins to promote seed germination and root growth, and can also dissolve insoluble phosphorus and potassium in the soil to improve nutrient availability. The three strains synthesize osmotic protective substances such as proline to help plants resist stresses such as drought. They also secrete exopolysaccharides to promote soil aggregate formation, enhancing air permeability and water retention. Actinomycetes Madura chibaensis can decompose complex organic matter, breaking down plant residues by secreting enzymes such as cellulase and chitinase, releasing nutrients such as nitrogen and phosphorus that can be used by plants. Furthermore, they produce the growth hormone indoleacetic acid, which stimulates plant root development and enhances nutrient absorption. They also possess the ability to biologically fix nitrogen, converting atmospheric nitrogen into ammonium nitrogen that can be directly absorbed by plants. The combination of these three strains synergistically enhances plant growth, while accelerating the decomposition of organic matter, promoting the formation of humus, and improving soil structure.

[0025] The organic fertilizer of the present invention is also added with rosmarinic acid and glucosamine sulfate. Wherein rosmarinic acid, as a natural plant extract, contains rich plant growth hormone, can stimulate plant cell division and root development, thereby promoting the overall growth of plants and increasing yield, and has powerful antioxidant properties, can remove free radicals in the plant body, and reduce oxidative stress damage. In addition, rosmarinic acid can be used as an energy source for soil microorganisms, promotes the proliferation of beneficial microorganisms, and enhances soil fertility. When the bacterial fertilizer is used in combination with rosmarinic acid, the content of soluble phosphorus in the soil can be increased, and nutrient absorption efficiency can be optimized. Rosmarinic acid has natural antibacterial and insect repellent properties. Its presence in compost can inhibit the growth of pathogens, reduce dependence on chemical pesticides, thereby maintaining soil ecological balance, and being added to the organic fertilizer can reduce the risk of plant being attacked by pathogens and pests. Glucosamine sulfate can stimulate plant cell division and elongation, accelerates seedling growth, makes crop leaves more emerald green and thick, and improves photosynthesis efficiency. Glucosamine sulfate promotes the proliferation of beneficial microorganisms in the soil, accelerates the decomposition of organic matter, and releases nutrients, thereby improving soil structure, enhancing air permeability and water retention, and creating optimal conditions for root growth. As a natural organic substance, glucosamine sulfate is non-toxic and has both medicinal and fertilizer properties, reducing reliance on chemical pesticides and fertilizers and effectively addressing soil compaction.

[0026] The other components selected in the present invention also have their own functions. Chicken manure and cow manure provide high nitrogen content and promote leaf growth; soybean meal and straw powder increase the carbon-nitrogen ratio and prolong the fertilizer effect; microbial agents accelerate the decomposition of organic matter; and humic acid enhances the water and fertilizer retention capacity of the soil.

[0027] Beneficial effects

[0028] The organic fertilizer of the present invention contains ingredients such as multiple beneficial microorganisms, rosmarinic acid, and glucosamine sulfate. The organic fertilizer obtained by compounding the above specific substances can, on the one hand, dissolve compounds such as phosphorus and potassium in the soil that are difficult for plants to absorb, promote plant nutrient absorption, and simultaneously increase the soil organic matter content, increase the soil aggregate structure, improve the soil's water and fertilizer retention capacity, significantly improve the soil's physical and chemical properties, and increase the fertilizer utilization rate; and on the other hand, can promote the growth of cabbage and increase the yield.

[0029] The organic fertilizer preparation process of the present invention uses a large amount of agricultural waste, which solves the environmental pollution caused by agricultural waste while utilizing its resources, thus achieving both environmental and economic benefits. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be further described below with reference to specific embodiments, but is not limited thereto.

[0031] Example 1

[0032] An organic fertilizer for promoting plant growth and improving soil comprises the following raw materials in parts by weight: 35 parts of decomposed chicken manure, 15 parts of soybean meal, 10 parts of straw powder, 10 parts of sweet potato vines, 8 parts of humic acid, 5 parts of composite microbial agent, 2 parts of rosmarinic acid, and 1 part of stimulant.

[0033] The stimulant is a glucosamine sulfate solution with a concentration of 5 mg / L.

[0034] The composite microbial agent comprises Actinomyces chibaensis, Pseudomonas stutzeri and Bacillus velezensis in a mass ratio of 1:1:1.

[0035] The deposit number of the Actinomyces chibaensis is CGMCC4.6236; the deposit number of the Pseudomonas stutzeri is CCTCC AB 2012149; and the deposit number of the Bacillus velezensis is CCTCC AB 2012100.

[0036] The preparation method of the composite microbial agent is as follows:

[0037] Chiba Madura Actinomyces, Pseudomonas stutzeri, and Bacillus velezensis were cultured in seed culture medium at 28°C, 30°C, and 35°C for 48 h, respectively, and inoculated into LB culture medium at a 5% inoculum volume, and cultured until the bacterial concentration OD 600 =3.0 to obtain three bacterial liquids, which were evenly mixed in a mass ratio of 1:1:1, and freeze-dried into freeze-dried powder to obtain a composite microbial agent.

[0038] The sweet potato vines are dried sweet potato vines, which are crushed and passed through a 60-mesh sieve.

[0039] A method for preparing an organic fertilizer for promoting plant growth and improving soil is prepared by the following steps:

[0040] (1) Raw material mixing:

[0041] Mix the decomposed chicken manure, soybean meal, straw powder and sweet potato vines evenly, then add humic acid, sprinkle it in while stirring, and stir for 20 minutes.

[0042] Mix for 10 minutes until uniform, then add compound microbial agent, rosmarinic acid and stimulant and stir until uniform;

[0043] (2) Regulating moisture and fermentation:

[0044] The mixture obtained in step (1) is adjusted to a moisture content of 45-55%, and piled into a fermentation pile 1-1.5 meters high, covered with a breathable film, and fermented for two weeks, during which the pile is turned over every three days;

[0045] (3) Granulation and drying:

[0046] The fermented material in step (2) is aired to a moisture content of 18-20%, granulated using a disc granulator to control the particle size to 3-5 mm, and then dried using a dryer to a moisture content of ≤10%, and naturally cooled to room temperature to obtain the final product, organic fertilizer granules.

[0047] Example 2

[0048] An organic fertilizer for promoting plant growth and improving soil comprises the following raw materials in parts by weight: 38 parts of decomposed chicken manure, 18 parts of soybean meal, 15 parts of straw powder, 12 parts of sweet potato vines, 9 parts of humic acid, 6 parts of a composite microbial agent, 2 parts of rosmarinic acid, and 2 parts of a stimulant.

[0049] The stimulant is a glucosamine sulfate solution with a concentration of 5 mg / L.

[0050] The composite microbial agent comprises Actinomyces chibaensis, Pseudomonas stutzeri and Bacillus velezensis in a mass ratio of 1:1:1.

[0051] The deposit number of the Actinomyces chibaensis is CGMCC4.6236; the deposit number of the Pseudomonas stutzeri is CCTCC AB 2012149; and the deposit number of the Bacillus velezensis is CCTCC AB 2012100.

[0052] The preparation method of the composite microbial agent is as follows:

[0053] Chiba Madura Actinomyces, Pseudomonas stutzeri, and Bacillus velezensis were cultured in seed culture medium at 28°C, 30°C, and 35°C for 48 h, respectively, and inoculated into LB culture medium at a 5% inoculum volume, and cultured until the bacterial concentration OD 600 =3.0 to obtain three bacterial liquids, which were evenly mixed in a mass ratio of 1:1:1, and freeze-dried into freeze-dried powder to obtain a composite microbial agent.

[0054] The sweet potato vines are dried sweet potato vines, which are crushed and passed through a 60-mesh sieve.

[0055] A method for preparing an organic fertilizer for promoting plant growth and improving soil is prepared by the following steps:

[0056] (1) Raw material mixing:

[0057] Mix the decomposed chicken manure, soybean meal, straw powder and sweet potato vines evenly, then add humic acid, sprinkle it in while stirring, and stir for 20 minutes.

[0058] Mix for 10 minutes until uniform, then add compound microbial agent, rosmarinic acid and stimulant and stir until uniform;

[0059] (2) Regulating moisture and fermentation:

[0060] The mixture obtained in step (1) is adjusted to a moisture content of 45-55%, and piled into a fermentation pile 1-1.5 meters high, covered with a breathable film, and fermented for two weeks, during which the pile is turned over every three days;

[0061] (3) Granulation and drying:

[0062] The fermented material in step (2) is aired to a moisture content of 18-20%, granulated using a disc granulator to control the particle size to 3-5 mm, and then dried using a dryer to a moisture content of ≤10%, and naturally cooled to room temperature to obtain the final product, organic fertilizer granules.

[0063] Example 3

[0064] An organic fertilizer for promoting plant growth and improving soil comprises the following raw materials in parts by weight: 40 parts of decomposed chicken manure, 20 parts of soybean meal, 20 parts of straw powder, 14 parts of sweet potato vines, 10 parts of humic acid, 8 parts of a composite microbial agent, 3 parts of rosmarinic acid, and 3 parts of a stimulant.

[0065] The stimulant is a glucosamine sulfate solution with a concentration of 5 mg / L.

[0066] The composite microbial agent comprises Actinomyces chibaensis, Pseudomonas stutzeri and Bacillus velezensis in a mass ratio of 1:1:1.

[0067] The deposit number of the Actinomyces chibaensis is CGMCC4.6236; the deposit number of the Pseudomonas stutzeri is CCTCC AB 2012149; and the deposit number of the Bacillus velezensis is CCTCC AB 2012100.

[0068] The preparation method of the composite microbial agent is as follows:

[0069] Chiba Madura Actinomyces, Pseudomonas stutzeri, and Bacillus velezensis were cultured in seed culture medium at 28°C, 30°C, and 35°C for 48 h, respectively, and inoculated into LB culture medium at a 5% inoculum volume, and cultured until the bacterial concentration OD 600 =3.0 to obtain three bacterial liquids, which were evenly mixed in a mass ratio of 1:1:1, and freeze-dried into freeze-dried powder to obtain a composite microbial agent.

[0070] The sweet potato vines are dried sweet potato vines, which are crushed and passed through a 60-mesh sieve.

[0071] A method for preparing an organic fertilizer for promoting plant growth and improving soil is prepared by the following steps:

[0072] (1) Raw material mixing:

[0073] Mix the decomposed chicken manure, soybean meal, straw powder and sweet potato vines evenly, then add humic acid and sprinkle it in while stirring. Stir for 20 minutes until it is evenly mixed. Finally, add the composite microbial agent, rosmarinic acid and stimulant and stir until it is evenly mixed.

[0074] (2) Regulating moisture and fermentation:

[0075] The mixture obtained in step (1) is adjusted to a moisture content of 45-55%, and piled into a fermentation pile 1-1.5 meters high, covered with a breathable film, and fermented for two weeks, during which the pile is turned over every three days;

[0076] (3) Granulation and drying:

[0077] The fermented material in step (2) is aired to a moisture content of 18-20%, granulated using a disc granulator to control the particle size to 3-5 mm, and then dried using a dryer to a moisture content of ≤10%, and naturally cooled to room temperature to obtain the final product, organic fertilizer granules.

[0078] Comparative Example 1

[0079] Compared with Example 3, this comparative example is the same as Example 3 except that only Actinomyces chibaensis is used in the preparation process of the composite microbial agent. The other raw materials and steps are the same as those in Example 3.

[0080] Comparative Example 2

[0081] Compared with Example 3, this comparative example is the same as Example 3 except that only Pseudomonas stutzeri is used in the preparation process of the composite microbial agent. The other raw materials and steps are the same as those in Example 3.

[0082] Comparative Example 3

[0083] Compared with Example 3, this comparative example is the same as Example 3 except that only Bacillus velezensis is used in the preparation process of the composite microbial agent. The other raw materials and steps are the same as those in Example 3.

[0084] Comparative Example 4

[0085] Compared with Example 3, this comparative example is the same as Example 3 except that rosmarinic acid is not added during the preparation process. The other raw materials and steps are the same as Example 3.

[0086] Comparative Example 5

[0087] Compared with Example 3, this comparative example is the same as Example 3 except that the stimulant glucosamine sulfate solution is not added during the preparation process. The other raw materials and steps are the same as Example 3.

[0088] Comparative Example 6

[0089] Compared with Example 3, this comparative example is the same as Example 3 except that rosmarinic acid and the stimulant glucosamine sulfate solution are not added during the preparation process. The other raw materials and steps are the same as Example 3.

[0090] Performance Testing

[0091] Planting trials

[0092] The planting test was carried out at our company's test base. The test variety was Beijing New No. 3. The Chinese cabbage was planted in high ridge cultivation with a ridge height of 20 cm, a row spacing of 60 cm × 46 cm, and a planting density of 3000 plants per mu. The experiment set up 10 treatment groups: the organic fertilizers of Examples 1-3 and Comparative Examples 1-6 and no fertilizer (control group) were applied respectively. The fertilizer application rate of each treatment group was 1500 kg / mu. Each treatment group was repeated 3 times, with a total of 30 plots, with an area of ​​5m × 6m, and random block arrangement. Two weeks before transplanting, all fertilizers were applied as a one-time base application, and the field management measures such as irrigation during the cabbage growing season and field pest and disease control were consistent. Sowing was carried out on August 10, 2023, and harvesting was carried out on November 3, 2023.

[0093] Chinese cabbage collection and determination:

[0094] During the Chinese cabbage harvest, six Chinese cabbage plants were randomly selected from each experimental plot. Four of these plants were used to measure plant height and width, and yield was calculated based on the total mass of the four plants. One-quarter of the cabbage heads of the other two plants were homogenized using a wall-breaking machine and then used to determine the quality of the cabbage. Soluble sugar content was determined using the anthrone-sulfuric acid colorimetric method, soluble protein content was determined using the Coomassie Brilliant Blue G250 colorimetric method, and nitrate content was determined using the phenol disulfonic acid colorimetric method. The results of these measurements are shown in Table 1.

[0095] Table 1 Agronomic traits, yield and quality results of Chinese cabbage

[0096]

[0097] As can be seen from the data in Table 1, after applying the organic fertilizers of Examples 1-3 of the present invention, the plant height, plant width, and yield of Chinese cabbage were significantly improved, and the quality of Chinese cabbage was further improved. After applying the organic fertilizers of Comparative Examples 1-6, which changed the formulation composition, the agronomic traits, yield, and quality of Chinese cabbage all declined to varying degrees. Therefore, in the present invention, the three bacteria of Actinomyces millefolium, Pseudomonas stutzeri, and Bacillus velezensis, as well as rosmarinic acid and glucosamine sulfate, are all core components of the present invention, and the lack of any one of them would result in a weaker effect.

[0098] Soil sample collection and testing:

[0099] During the Chinese cabbage harvest period, soil samples were collected from the 0-20 cm layer of each treatment plot using a five-point sampling method with a soil drill. Soil organic matter, ammonium nitrogen, available phosphorus, and available potassium were measured. Organic matter content was determined using the externally heated potassium dichromate oxidation method. Soil ammonium nitrogen content was determined using a continuous flow analyzer after extraction with 1 mol / L KCl solution. Available phosphorus content was determined colorimetrically after extraction with 0.5 mol / L NaHCO₃. Available potassium content was determined using a flame photometer after extraction with 1 mol / L NH₄OAc solution. The results are shown in Table 2.

[0100] Table 2 Physical and chemical properties of soil

[0101]

[0102] As shown in Table 2, the physicochemical properties of the soil are improved after applying the organic fertilizer of the embodiment of the present invention, which is specifically manifested in that applying the organic fertilizer of the present invention can improve soil ammonium nitrogen, available phosphorus, quick-acting potassium, and organic matter content. Ammonium nitrogen is important mineralized nitrogen in the soil. It can be absorbed and utilized by plants directly or through conversion into nitrate nitrogen. It is an important measure of soil fertility and an important nitrogen source for crop growth. As shown in Table 2, after applying the organic fertilizer of the present invention, soil ammonium nitrogen content significantly increases; Available phosphorus can reflect the total amount of phosphorus that can be released in the present and future. As shown in Table 2, after applying the organic fertilizer of the present invention, after planting Chinese cabbage, there are still a large amount of phosphorus reserves in the soil; Quick-acting potassium is also an important indicator of soil fertility. As shown in Table 2, after applying the organic fertilizer of the present invention, the quick-acting potassium content in the soil is significantly improved than the blank control. As shown in the above data, the organic fertilizer of the present invention can improve soil physicochemical properties.

[0103] It should be noted that the above embodiments are only some of the preferred embodiments of the present invention, and not all of them. Obviously, based on the above embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

Claims

1. An organic fertilizer for promoting plant growth and soil improvement, characterized in that: The method comprises the following raw materials in parts by weight: 35-40 parts of decomposed chicken manure, 15-20 parts of soybean meal, 10-20 parts of straw powder, 10-14 parts of sweet potato vines, 8-10 parts of humic acid, 5-8 parts of composite microbial agent, 2-3 parts of rosmarinic acid, and 1-3 parts of stimulant; The stimulant is a glucosamine sulfate solution with a concentration of 5 mg / L; The composite microbial agent comprises Actinomyces chibaensis, Pseudomonas stutzeri and Bacillus velezensis in a mass ratio of 1:1:

1.

2. The organic fertilizer for promoting plant growth and soil improvement according to claim 1, wherein The deposit number of the Actinomyces chibaensis is CGMCC4.6236; the deposit number of the Pseudomonas stutzeri is CCTCC AB2012149; and the deposit number of the Bacillus velezensis is CCTCCAB 2012100.

3. The organic fertilizer for promoting plant growth and soil improvement according to claim 1, wherein The preparation method of the composite microbial agent is as follows: Chiba Madura Actinomyces, Pseudomonas stutzeri, and Bacillus velezensis were cultured in seed culture medium at 28°C, 30°C, and 35°C for 48 h, respectively, and inoculated into LB culture medium at a 5% inoculum volume, and cultured until the bacterial concentration OD 600 =3.0 to obtain three bacterial liquids, which were evenly mixed in a mass ratio of 1:1:1, and freeze-dried into freeze-dried powder to obtain a composite microbial agent.

4. The organic fertilizer for promoting plant growth and soil improvement according to claim 1, wherein The sweet potato vines are dried sweet potato vines, which are crushed and passed through a 60-mesh sieve.

5. A method for preparing an organic fertilizer for promoting plant growth and soil improvement according to any one of claims 1 to 4, characterized in that: Prepared by the following steps: (1) Raw material mixing: Mix the decomposed chicken manure, soybean meal, straw powder and sweet potato vines evenly, then add humic acid and sprinkle it in while stirring. Stir for 20 minutes until it is evenly mixed. Finally, add the composite microbial agent, rosmarinic acid and stimulant and stir until it is evenly mixed. (2) Regulating moisture and fermentation: The mixture obtained in step (1) is adjusted to a moisture content of 45-55%, and piled into a fermentation pile 1-1.5 meters high, covered with a breathable film, and fermented for two weeks, during which the pile is turned over every three days; (3) Granulation and drying: The fermented material in step (2) is aired to a moisture content of 18-20%, granulated using a disc granulator to control the particle size to 3-5 mm, and then dried using a dryer to a moisture content of ≤10%, and naturally cooled to room temperature to obtain the final product, organic fertilizer granules.

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