Composite microbial fertilizer for rice and preparation method thereof

Abstract

The present invention discloses a composite microbial fertilizer for rice and a preparation method thereof, relating to the technical field of composite microbial fertilizers. The composite microbial fertilizer comprises the following components by weight: 8 to 12 parts nitrogen fertilizer, 6 to 10 parts phosphorus fertilizer, 5 to 9 parts potassium fertilizer, 30 to 70 parts fermented organic fertilizer, and 0.5 to 2.5 parts modified additive. The beneficial effects of the present invention are that the scientific combination of bacterial strains and the synergy between the bacterial strains improve the disease resistance of rice, and can also increase the nitrogen, phosphorus, and potassium fertilizers required for rice growth, thereby promoting rice growth.

Description

Technical Field

[0001] The present invention relates to the technical field of compound microbial fertilizers, in particular to a compound microbial fertilizer for rice and a preparation method thereof. Background Art

[0002] Rice is one of the world's most important food crops, feeding more than half of the world's population. Rice cultivation accounts for approximately 20% of the world's total grain-growing area. Rice is the largest cultivated crop in my country, and its yield and quality impact people's survival and quality of life. Safe, green, and organic rice is gaining increasing market demand.

[0003] With the continuous growth of food demand, fertilizer use in agricultural production has generally shown an upward trend, but my country's fertilizer utilization rate is only around 30%. At the same time, the blind increase and excessive use of chemical fertilizers not only increases costs but also disrupts soil structure, nutrient balance, and microbial diversity. This leads to poor rice growth, difficulty in increasing yields, reduced rice quality, and, in particular, a high incidence of rice diseases, seriously affecting farmers' economic benefits.

[0004] To address this issue, various new fertilizers are now available on the market, including organic-inorganic compound fertilizers, organic composite fertilizers, and microbial fertilizers. Organic fertilizers have a longer-lasting effect, increasing and renewing soil organic matter, improving soil physical and chemical properties and biological activity. Microbial fertilizers increase the number of beneficial microorganisms in the soil, enhancing crop absorption and utilization of soil water and nutrients. To ensure high rice yields without chemical fertilizer and pesticide residues, compound microbial fertilizers have emerged. Compound microbial fertilizers, a combination of microorganisms and nutrients, can provide, maintain, or improve plant nutrition, increasing agricultural yields or improving agricultural product quality, while leaving little chemical residue and being pollution-free.

[0005] In addition, when using urea as a nitrogen fertilizer, since urea itself has strong hygroscopicity and is easy to form lattice compounds, the urea-based compound fertilizer is easy to absorb moisture during preparation and storage and produce caking and powdering. On the one hand, the agglomerated fertilizer will cause the package to break during storage and transportation, and on the other hand, it will easily cause the nozzle to be blocked during the fertilization process, affecting the application. Summary of the Invention

[0006] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a composite microbial fertilizer for rice and a preparation method thereof.

[0007] The technical solutions of the present invention are as follows:

[0008] A first aspect of the present invention provides a composite microbial fertilizer for rice, comprising the following components in parts by weight: 8 to 12 parts of nitrogen fertilizer, 6 to 10 parts of phosphorus fertilizer, 5 to 9 parts of potassium fertilizer, 30 to 70 parts of fermented organic fertilizer, and 0.5 to 2.5 parts of a modified additive.

[0009] Preferably, the fermented organic fertilizer is obtained by fermenting organic materials using composite microbial agents A and composite microbial agents B, and the organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and the mass ratio thereof is 3~7:2~6:2~4:1~2:1~2.

[0010] Preferably, the composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 8-12:5-9:3-5:2-6:1-3, and the added amount of the composite microbial agent A is 6-12% of the mass of the organic material.

[0011] Preferably, the composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, and the mass ratio thereof is 4-10:2-6:1-3:1-3:2-6, and the addition amount of the composite microbial agent B is 3-7% of the mass of the organic material.

[0012] Preferably, the method for preparing the fermented organic fertilizer comprises: first, uniformly mixing the composite microbial agent A with the organic material, and fermenting for 3 to 7 days at a fermentation temperature of 35 to 38° C. and a humidity of 55 to 60%; then, adding the composite microbial agent B, mixing evenly, and continuing to ferment for 7 to 10 days at a fermentation temperature of 30 to 32° C. and a humidity of 65 to 70% to obtain the fermented organic fertilizer.

[0013] Preferably, the preparation method of the modified additive comprises:

[0014] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0015] Add β-cyclodextrin to water, heat to 60-80°C, and stir to dissolve to form a cyclodextrin dispersion;

[0016] Add the calcined material to the cyclodextrin dispersion, continue to add polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride, stir, and heat at 60-70°C for 2-4 hours;

[0017] Continue to add stearic acid and octadecylamine, and heat at 30-40° C. for 1-2 hours to obtain a modified additive.

[0018] Preferably, the calcination is first heated to 200-280°C at a rate of 1-3°C / min and kept warm for 1-2 hours, then heated to 400-500°C at a rate of 1-3°C / min and kept warm for 1-2 hours, and finally heated to 800-900°C at a rate of 3-5°C / min and kept warm for 1-2 hours.

[0019] Preferably, the mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 1-2:1-2:1:1.

[0020] Preferably, the amount of polyethylene glycol added is 1 to 2 times the mass of β-cyclodextrin, and the amount of 2,3-epoxypropyltrimethylammonium chloride added is 0.3 to 0.7 times the mass of β-cyclodextrin.

[0021] Preferably, the amount of stearic acid added is 3-5% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the amount of octadecylamine added is 6-8% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0022] Preferably, the nitrogen fertilizer is one or more of urea, ammonium nitrate, ammonium chloride or ammonium sulfate, the phosphate fertilizer is one or more of superphosphate, monoammonium phosphate or diammonium phosphate, and the potash fertilizer is one or more of potassium sulfate, potassium nitrate and potassium dihydrogen phosphate.

[0023] A second aspect of the present invention provides a method for preparing a composite microbial fertilizer for rice, comprising the following steps:

[0024] The fermented organic fertilizer is mixed with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer and modified additives, crushed, granulated and dried to obtain compound microbial fertilizer.

[0025] The present invention has at least one of the following beneficial effects:

[0026] The present invention adds two types of microbial agents, namely, composite microbial agent A and composite microbial agent B, and through scientific matching of bacterial strains and synergy between the bacterial strains, can effectively ferment organic raw materials such as livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, so that nutrients therein are fully released, the nutritional components can be fully utilized, and the fertilizer efficiency is improved. In addition, the microorganisms in the microbial agent can be adsorbed on the hyphae of pathogenic fungi and grow together with the hyphae. During the growth process, lytic substances are generated, thereby digesting the mycelium, generally causing the hyphae to break, disintegrate, or digest the cytoplasm, thereby improving the disease resistance of rice, such as preventing and controlling rice sheath blight. Moreover, after being applied to the soil, the microbial agent of the present invention can decompose some original secondary minerals in the soil, and at the same time fix these minerals to release nutrients such as phosphorus and potassium, so that phosphorus is in an ineffective state and potassium is converted into an effective state for effective nutrient absorption and utilization by crops. The potassium is directly absorbed and utilized by the crops, thereby improving the soil's fertilizer supply capacity.

[0027] The present invention prepares a modified additive and mixes the modified additive with urea, phosphate fertilizer, etc., thereby helping to reduce compound fertilizer agglomeration. Specifically, zeolite powder, diatomaceous earth, and vermiculite can adhere to the surface of fertilizer particles, becoming obstacles to crystal connection between particles, thereby achieving the purpose of inhibiting fertilizer agglomeration. In addition, the present invention also modifies the zeolite powder, diatomaceous earth, vermiculite, and cyclodextrin, thereby not only improving the dispersibility of the zeolite powder, diatomaceous earth, vermiculite, and cyclodextrin, but also modifying the surface of the zeolite powder, diatomaceous earth, vermiculite, and cyclodextrin, thereby eliminating the van der Waals force between the fertilizer particles, and coating the surface of the fertilizer particles to reduce the adhesion between fertilizer particle molecules, thereby reducing the adhesion of the fertilizer particles and reducing fertilizer agglomeration. In addition, zeolite powder, diatomaceous earth and vermiculite can play a role in slow-release of fertilizer effect, achieve long-term and slow-release of fertilizer, improve soil and reduce loss of nutrient elements. The modified cyclodextrin of the present invention can be combined with fertilizer, thereby further improving the slow-release effect. Implementation Method

[0028] The present invention is further described in detail below with reference to specific examples, but the present invention is not limited to the following specific examples. Example

[0029] The following components were weighed in parts by weight: 8 parts of nitrogen fertilizer, 6 parts of phosphorus fertilizer, 5 parts of potassium fertilizer, 30 parts of fermented organic fertilizer, and 0.5 parts of modified additive.

[0030] The fermented organic fertilizer is obtained by fermenting organic materials with composite microbial agents A and B. The organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and the mass ratio thereof is 3:2:2:1:1.

[0031] Composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 8:5:3:2:1. The amount of composite microbial agent A added is 6-12% of the mass of the organic material.

[0032] The composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, with a mass ratio of 4:2:1:1:2. The addition amount of the composite microbial agent B is 3-7% of the mass of the organic material.

[0033] The preparation method of the modified additive comprises:

[0034] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0035] Add β-cyclodextrin to water, heat to 60°C, and stir to dissolve to form a cyclodextrin dispersion;

[0036] The calcined material was added to the cyclodextrin dispersion, and polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride were added, stirred, and heated at 60°C for 2h;

[0037] Stearic acid and octadecylamine were added continuously, and the mixture was heated at 30° C. for 1 h to obtain a modified additive.

[0038] The mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 1:1:1:1.

[0039] The added amount of polyethylene glycol is 1 times the mass of β-cyclodextrin, and the added amount of 2,3-epoxypropyltrimethylammonium chloride is 0.7 times the mass of β-cyclodextrin.

[0040] The added amount of stearic acid is 3% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 8% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0041] The nitrogen fertilizer is urea, the phosphorus fertilizer is superphosphate, and the potash fertilizer is potassium sulfate.

[0042] A method for preparing a composite microbial fertilizer for rice comprises the following steps:

[0043] S1. First, the composite microbial agent A is mixed evenly with the organic material, and fermented for 3 days at a fermentation temperature of 35° C. and a humidity of 55%. Then, the composite microbial agent B is added and mixed evenly, and the fermentation is continued for 10 days at a fermentation temperature of 30° C. and a humidity of 65% to obtain the organic material.

[0044] S2. Mixing the fermented organic fertilizer with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and modified additives, granulating, and drying to obtain a compound microbial fertilizer. Example

[0045] The following components were weighed in parts by weight: 9 parts of nitrogen fertilizer, 7 parts of phosphorus fertilizer, 6 parts of potassium fertilizer, 40 parts of fermented organic fertilizer, 12 parts of compound microbial agent A, 5 parts of compound microbial agent B, and 1 part of a modified additive.

[0046] Among them, the fermented organic fertilizer is obtained by fermenting organic materials using compound microbial agents A and compound microbial agents B; the organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, with the ratio being 4:3:2.5:1.2:1.2.

[0047] The composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 9:6:3.5:3:1.5. The addition amount of the composite microbial agent A is 7% of the mass of the organic material.

[0048] The composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, with a mass ratio of 5:3:1.5:1.5:3. The addition amount of the composite microbial agent B is 4% of the mass of the organic material.

[0049] The preparation method of the modified additive comprises:

[0050] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0051] Add β-cyclodextrin to water, heat to 65°C, and stir to dissolve to form a cyclodextrin dispersion;

[0052] Add the calcined material to the cyclodextrin dispersion, continue to add polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride, stir, and heat at 65°C for 3 hours;

[0053] Stearic acid and octadecylamine were added continuously, and the mixture was heated at 35° C. for 1.5 h to obtain a modified additive.

[0054] The mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 1:2:1:1.

[0055] The added amount of polyethylene glycol is 1.5 times the mass of β-cyclodextrin, and the added amount of 2,3-epoxypropyltrimethylammonium chloride is 0.6 times the mass of β-cyclodextrin.

[0056] The added amount of stearic acid is 3.5% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 6.5% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0057] The nitrogen fertilizer is urea and ammonium nitrate in a ratio of 1:1 by mass, the phosphorus fertilizer is monoammonium phosphate, and the potassium fertilizer is potassium nitrate.

[0058] A method for preparing a composite microbial fertilizer for rice comprises the following steps:

[0059] S1. First, the composite microbial agent A is mixed evenly with the organic material and fermented for 4 days at a fermentation temperature of 36°C and a humidity of 56%. Then, the composite microbial agent B is added and mixed evenly. The fermentation is continued for 9 days at a fermentation temperature of 31°C and a humidity of 66% to obtain a fermented organic fertilizer.

[0060] S2. Mixing the fermented organic fertilizer with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and modified additives, granulating, and drying to obtain a compound microbial fertilizer. Example

[0061] The following components were weighed in parts by weight: 10 parts of nitrogen fertilizer, 8 parts of phosphorus fertilizer, 7 parts of potash fertilizer, 50 parts of fermented organic fertilizer, and 1.5 parts of modified additive.

[0062] The fermented organic fertilizer is obtained by fermenting organic materials with composite microbial agents A and B. The organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and the ratio is 5:4:3:1.5:1.5.

[0063] The composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 10:7:4:4:2. The addition amount of the composite microbial agent A is 9% of the mass of the organic material.

[0064] The composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, with a mass ratio of 7:4:2:2:4. The addition amount of the composite microbial agent B is 5% of the mass of the organic material.

[0065] The preparation method of the modified additive comprises:

[0066] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0067] Add β-cyclodextrin to water, heat to 70°C, and stir to dissolve to form a cyclodextrin dispersion;

[0068] Add the calcined material to the cyclodextrin dispersion, continue to add polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride, stir, and heat at 65°C for 3 hours;

[0069] Stearic acid and octadecylamine were added continuously, and the mixture was heated at 35° C. for 1.5 h to obtain a modified additive.

[0070] The mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 1.5:1.5:1:1.

[0071] The added amount of polyethylene glycol is 1.52 times the mass of β-cyclodextrin, and the added amount of 2,3-epoxypropyltrimethylammonium chloride is 0.5 times the mass of β-cyclodextrin.

[0072] The added amount of stearic acid is 4% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 7% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0073] The nitrogen fertilizer is urea and ammonium chloride in a ratio of 1:1 by mass, the phosphate fertilizer is diammonium phosphate, and the potash fertilizer is potassium dihydrogen phosphate.

[0074] A method for preparing a composite microbial fertilizer for rice comprises the following steps:

[0075] S1. First, the composite microbial agent A is mixed evenly with the organic material and fermented for 5 days at a fermentation temperature of 35-38°C and a humidity of 57%. Then, the composite microbial agent B is added and mixed evenly. The fermentation is continued for 8 days at a fermentation temperature of 32°C and a humidity of 68% to obtain a fermented organic fertilizer.

[0076] S2. Mixing the fermented organic fertilizer with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and modified additives, granulating, and drying to obtain a compound microbial fertilizer. Example

[0077] The following components were weighed in parts by weight: 11 parts of nitrogen fertilizer, 9 parts of phosphorus fertilizer, 8 parts of potash fertilizer, 60 parts of fermented organic fertilizer, and 2 parts of modified additive.

[0078] Among them, the fermented organic fertilizer is obtained by fermenting organic materials using compound microbial agents A and compound microbial agents B. The organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and the ratio is 6:5:3.5:1.8:1.8.

[0079] The composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 11:8:4.5:5:2.5. The addition amount of the composite microbial agent A is 11% of the mass of the organic material.

[0080] The composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, with a mass ratio of 9:5:2.5:2.5:5. The addition amount of the composite microbial agent B is 6% of the mass of the organic material.

[0081] The preparation method of the modified additive comprises:

[0082] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0083] Add β-cyclodextrin to water, heat to 75°C, and stir to dissolve to form a cyclodextrin dispersion;

[0084] The calcined material was added to the cyclodextrin dispersion, and polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride were added, stirred, and heated at 68°C for 3 hours;

[0085] Continue to add stearic acid and octadecylamine, and heat at 38° C. for 1.5 to obtain a modified additive.

[0086] The mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 2:1:1:1.

[0087] The added amount of polyethylene glycol is 1.8 times the mass of β-cyclodextrin, and the added amount of 2,3-epoxypropyltrimethylammonium chloride is 0.4 times the mass of β-cyclodextrin.

[0088] The added amount of stearic acid is 3.5% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 6.5% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0089] The nitrogen fertilizer is urea and ammonium sulfate in a mass ratio of 1:1, the phosphorus fertilizer is superphosphate, and the potash fertilizer is potassium sulfate.

[0090] A method for preparing a composite microbial fertilizer for rice comprises the following steps:

[0091] S1. First, the composite microbial agent A is mixed evenly with the organic material and fermented for 6 days at a fermentation temperature of 35-38°C and a humidity of 58%. Then, the composite microbial agent B is added and mixed evenly, and the fermentation is continued for 9 days at a fermentation temperature of 32°C and a humidity of 68% to obtain a fermented organic fertilizer.

[0092] S2. Mixing the fermented organic fertilizer with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and modified additives, granulating, and drying to obtain a compound microbial fertilizer. Example

[0093] The following components were weighed in parts by weight: 12 parts of nitrogen fertilizer, 10 parts of phosphorus fertilizer, 9 parts of potash fertilizer, 70 parts of fermented organic fertilizer, and 2.5 parts of modified additives.

[0094] The fermented organic fertilizer is obtained by fermenting organic materials with composite microbial agents A and B. The organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and the ratio is 7:6:4:2:2.

[0095] The composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas in a mass ratio of 12:9:5:6:3. The addition amount of the composite microbial agent A is 12% of the mass of the organic material.

[0096] The composite microbial agent B includes bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, with a mass ratio of 10:6:3:3:6. The addition amount of the composite microbial agent B is 7% of the mass of the organic material.

[0097] The preparation method of the modified additive comprises:

[0098] The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 mesh to obtain a roasted material;

[0099] Add β-cyclodextrin to water, heat to 80°C, and stir to dissolve to form a cyclodextrin dispersion;

[0100] Add the calcined material to the cyclodextrin dispersion, continue to add polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride, stir, and heat at 70°C for 2-4 hours;

[0101] Stearic acid and octadecylamine were added continuously, and the mixture was heated at 40° C. for 2 h to obtain a modified additive.

[0102] The mass ratio of zeolite powder, diatomaceous earth, vermiculite and β-cyclodextrin is 1:2:1:1.

[0103] The added amount of polyethylene glycol is 2 times the mass of β-cyclodextrin, and the added amount of 2,3-epoxypropyltrimethylammonium chloride is 0.3 times the mass of β-cyclodextrin.

[0104] The added amount of stearic acid is 5% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 6% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

[0105] The nitrogen fertilizer is urea, the phosphorus fertilizer is monoammonium phosphate, and the potash fertilizer is potassium dihydrogen phosphate.

[0106] A method for preparing a composite microbial fertilizer for rice comprises the following steps:

[0107] S1. First, the composite microbial agent A is mixed evenly with the organic material and fermented for 7 days at a fermentation temperature of 38°C and a humidity of 60%. Then, the composite microbial agent B is added and mixed evenly. The fermentation is continued for 10 days at a fermentation temperature of 32°C and a humidity of 70% to obtain a fermented organic fertilizer.

[0108] S2. Mixing the fermented organic fertilizer with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and modified additives, granulating, and drying to obtain a compound microbial fertilizer.

[0109] The difference from Example 1 is that the composite microbial agent A is not added to the fermented organic fertilizer, and the rest is the same as in Example 1.

[0110] The difference from Example 1 is that no modifying additive is added, and the rest is the same as the example.

[0111] Fertilizer caking test:

[0112] The compound microbial fertilizer samples prepared in Examples 1 to 5 and Comparative Example 2 were subjected to agglomeration experiments, and the specific operations were as follows:

[0113] The treated compound fertilizer samples were double-wrapped in sample packaging bags and labeled to divide them into groups. Then, the samples were placed in an accelerated agglomeration device and pressure was applied to the compound fertilizer samples. The accelerated agglomeration device was placed in a high-low temperature and humidity test chamber. The temperature was controlled at 45-50°C and the relative humidity was 70-75% during the day. At night, the power was turned off and the humidity was returned to room temperature and indoor ambient humidity. After 5-7 days, the samples were taken out and three groups of samples were dropped from a height of 1 m on both sides 1-2 times. After unpacking, they were sieved with a standard sieve and the anti-caking effect was tested by the agglomeration rate. The agglomeration rate was calculated according to the following formula:

[0114] Agglomeration rate = mass of agglomerated compound fertilizer / mass of compound fertilizer*100%

[0115] The results are shown in Table 1:

[0116] Table 1

[0117] Agglomeration rate Example 1 3.1% Example 2 2.2% Example 3 2.1% Example 4 1.5% Example 5 1.3% Comparative Example 2 32%

[0118] As can be seen from Table 1, the caking rates of Examples 1-5 are relatively low, particularly in Example 5, which has a caking rate of only 1.3%. Comparing Examples 1-5 with Comparative Example 2, it can be seen that the caking rates of Examples 1-5 are much lower than those of Comparative Example 2 (no modifying additive added), demonstrating that the present invention can reduce the caking rate of fertilizers by adding modifying additives.

[0119] 2. Rice growth test

[0120] The composite microbial fertilizers prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were applied at 50 kg / mu to the plotted test fields before rice planting and after tillage, followed by watering and transplanting. The later management and control methods were the same. The rice plant height, total yield, and incidence of sheath blight in different test plots were counted during the rice growth and harvest periods. The sheath blight survey method was tested in accordance with GB / T17980.20-2000.

[0121] The results are shown in Table 2:

[0122] Rice plant height (cm) Total yield (kg / mu) Incidence rate of sheath blight (%) Example 1 98.3 713 2.24 Example 2 99.8 721 2.16 Example 3 101.4 729 2.09 Example 4 101.7 732 2.05 Example 5 102.6 743 1.97 Comparative Example 1 93.7 668 7.5 Comparative Example 2 97.8 705 2.52

[0123] As can be seen from Table 2, the composite microbial fertilizer of the present invention has a good fertilizer effect. When the composite microbial fertilizers prepared in Examples 1 to 5 were applied to the test fields, the plant height of rice was greater than 98 cm, the yield per mu was greater than 710 kg, and the incidence of sheath blight was below 2.24%. Compared with Comparative Examples 1 and 2, it can be seen that the plant height and yield per mu of rice in Examples 1 to 5 were greater than those in Comparative Examples 1 and 2, and the incidence of sheath blight was lower than that in Comparative Examples 1 and 2. This shows that the composite microbial fertilizer of the present invention can promote rice growth and prevent and control rice sheath blight.

[0124] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A compound microbial fertilizer for rice, characterized in that: The invention comprises the following components in parts by weight: 8 to 12 parts of nitrogen fertilizer, 6 to 10 parts of phosphorus fertilizer, 5 to 9 parts of potash fertilizer, 30 to 70 parts of fermented organic fertilizer, and 0.5 to 2.5 parts of modified additive; The preparation method of the modified additive comprises: The zeolite powder, diatomaceous earth and vermiculite are mixed, then roasted and crushed to 1000-1500 meshes to obtain a roasted material; Add β-cyclodextrin to water, heat to 60-80°C, and stir to dissolve to form a cyclodextrin dispersion; Add the roasted material to the cyclodextrin dispersion, continue to add polyethylene glycol and 2,3-epoxypropyltrimethylammonium chloride, stir, and heat at 60-70°C for 2-4 hours; Continue to add stearic acid and octadecylamine, and heat at 30-40° C. for 1-2 hours to obtain a modified additive.

2. The composite microbial fertilizer for rice according to claim 1, characterized in that: The fermented organic fertilizer is obtained by fermenting organic materials using composite microbial agents A and composite microbial agents B. The organic materials are composed of livestock and poultry manure, crop straw, bean dregs, soybean meal, and distiller's grains, and their mass ratio is 3-7:2-6:2-4:1-2:1-2. The composite microbial agent A includes Bacillus amyloliquefaciens, Lactobacillus acidophilus, Trichoderma viride, Saccharomyces cerevisiae, and Sphingomonas, and their mass ratio is 8-12:5-9:3-5:2-6:1-3. The composite microbial agent B includes Bifidobacterium, nitrifying bacteria, nitrogen-fixing bacteria, Rhodopseudomonas palustris, and Streptomyces jingyangensis, and their mass ratio is 4-10:2-6:1-3:1-3:2-6.

3. The composite microbial fertilizer for rice according to claim 2, characterized in that: The addition amount of the composite microbial agent A is 6-12% of the mass of the organic material; the addition amount of the composite microbial agent B is 3-7% of the mass of the organic material.

4. The composite microbial fertilizer for rice according to claim 2, characterized in that: The preparation method of the fermented organic fertilizer comprises: firstly, uniformly mixing a composite microbial agent A with organic materials, and fermenting for 3 to 7 days at a fermentation temperature of 35 to 38° C. and a humidity of 55 to 60%; then, adding a composite microbial agent B, uniformly mixing, and continuing to ferment for 7 to 10 days at a fermentation temperature of 30 to 32° C. and a humidity of 65 to 70% to obtain the fermented organic fertilizer.

5. The composite microbial fertilizer for rice according to claim 1, characterized in that: The calcination process is first heated to 200-280°C at a rate of 1-3°C / min and kept warm for 1-2 hours, then heated to 400-500°C at a rate of 1-3°C / min and kept warm for 1-2 hours, and finally heated to 800-900°C at a rate of 3-5°C / min and kept warm for 1-2 hours.

6. The composite microbial fertilizer for rice according to claim 1, characterized in that: The mass ratio of the zeolite powder, diatomaceous earth, vermiculite and beta-cyclodextrin is 1-2:1-2:1:1; the amount of polyethylene glycol added is 1-2 times the mass of beta-cyclodextrin, and the amount of 2,3-epoxypropyltrimethylammonium chloride added is 0.3-0.7 times the mass of beta-cyclodextrin.

7. The composite microbial fertilizer for rice according to claim 1, characterized in that: The added amount of stearic acid is 3-5% of the total mass of zeolite powder, diatomaceous earth and vermiculite, and the added amount of octadecylamine is 6-8% of the total mass of zeolite powder, diatomaceous earth and vermiculite.

8. The composite microbial fertilizer for rice according to claim 1, characterized in that: The nitrogen fertilizer is one or more of urea, ammonium nitrate, ammonium chloride or ammonium sulfate, the phosphate fertilizer is one or more of superphosphate, monoammonium phosphate or diammonium phosphate, and the potash fertilizer is one or more of potassium sulfate, potassium nitrate and potassium dihydrogen phosphate.

9. The method for preparing a composite microbial fertilizer for rice according to claim 1, characterized in that: The following steps are involved: The fermented organic fertilizer is mixed with nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer and modified additives, crushed, granulated and dried to obtain compound microbial fertilizer.