A double-embedded biological compound fertilizer

Abstract

A double-embedded biological compound fertilizer is prepared by fermenting bamboo scraps and animal feces to prepare organic fermented materials, and then the organic fermented materials and microbial promoters are mixed to prepare compound fertilizers, wherein the microbial promoter is prepared by culturing microbial agents to prepare mixed bacterial liquid, and then solid substances starch and dextrin are added to mix to obtain nutrients, and the nutrients are added to a mixed aqueous solution of sodium alginate and boric acid, and then solid substances bamboo charcoal powder and diatomaceous earth are added in sequence, and finally calcium chloride aqueous solution is added dropwise to react, and after the reaction is completed, filtered, dried and crushed to obtain. In the double-embedded compound fertilizer of the present invention, a symbiotic system is formed by mixing organic fermented materials and microbial promoters to promote the healthy growth of strawberries, and the yield of strawberries can reach 3800kg / mu, which is more than 50.51% higher than that of plots without biological compound fertilizers, and the strawberry fruits are uniform in size, juicy, sweet, and bright red in color.

Description

[0001] This invention is a divisional application of the invention patent application number "202311819972.9" and the invention name is "A biological compound fertilizer and its preparation method". Technical Field

[0002] The invention relates to the technical field of biocomposite fertilizers, and in particular to a double-embedded biocomposite fertilizer. Background Art

[0003] High-value cash crops such as strawberries are mainly produced in off-season protected areas, with high economic benefits. However, due to the continuous replanting and extensive use of chemical fertilizers in protected areas, soil fertility has decreased. Strawberries have shallow roots, and strawberry growth requires trace elements such as nitrogen, phosphorus, potassium, boron, calcium, magnesium, zinc, iron, manganese, copper, molybdenum, and sulfur. Therefore, the surface structure and texture of the soil have a great influence on the growth of strawberries. In order to make strawberries grow well and obtain high-yield and high-quality strawberry berries, it is best to cultivate them on soils rich in organic matter and good water and fertilizer retention capabilities. There are many types of organic fertilizers on the market now, and they are also used for many purposes, but the fertilizer efficiency is not high, and the fertilizer effect lasts for a short time. It is difficult to maintain the long-term and continuous growth requirements of strawberries, resulting in poor fruit quality, light fruit taste, and poor coloring of strawberries. Therefore, it is necessary to have a long-term fertilizer effect and a fertilizer that regulates the soil for a long time to maintain the long-term and continuous growth of strawberries and improve the quality and yield of strawberry results. Summary of the invention

[0004] The invention aims to provide a double-embedded biological compound fertilizer.

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned biocomposite fertilizer. By double embedding the beneficial microbial agent, the fertilizer effect of the entire biocomposite fertilizer is slow-released, thereby improving the yield and quality of strawberries.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A double-encapsulated biological compound fertilizer is characterized in that: the biological compound fertilizer is prepared by fermenting bamboo scraps and animal feces to prepare organic fermented materials, and then the organic fermented materials and a microbial promoter are mixed to prepare compound fertilizer, the microbial promoter is prepared by culturing microbial agents to prepare mixed bacterial liquid, and then solid substances starch and dextrin are added to mix to obtain nutrients, the nutrients are added to a mixed aqueous solution of sodium alginate and boric acid, and then solid substances bamboo charcoal powder and diatomaceous earth are added in sequence, and finally a calcium chloride aqueous solution is added dropwise to react, and after the reaction is completed, filtering, drying and crushing are performed to obtain the microbial promoter.

[0008] Furthermore, the bamboo chips are obtained by crushing bamboo and its scraps, including bamboo, bamboo leaves, bamboo branches, etc.

[0009] In addition to N, P, and K, bamboo shavings also contain 23 trace elements, including Al, Ca, Mg, Ba, Mn, Zr, Ti, Pb, Su, Ga, Cr, Ni, Mo, Cu, Yb, Zn, Sr, K, Na, P, B, and Si, which fully contain all the nutrients for strawberry growth.

[0010] After fermentation, cow dung or sheep dung contains nutrients such as nitrogen, phosphorus, and potassium, which can promote the growth of strawberries. It contains high organic matter and cellulose, which can improve soil structure and increase soil aeration and water retention.

[0011] Furthermore, the microorganisms in the microbial promoter include phosphate-releasing bacteria, gibberellins and rhizobia, which are cultured to a concentration of 20-50×10 6 cfu / g, and then the phosphate-releasing bacteria, gibberellin and rhizobium were mixed into a mixed bacterial solution in a volume ratio of 1:0.5:0.5.

[0012] Furthermore, the mass ratio of the bamboo scraps to the animal excrement is 1:0.5-1.5, and the animal excrement is cow excrement or sheep excrement.

[0013] Furthermore, after adding bamboo charcoal powder and diatomaceous earth, stirring was performed at 30-60 rpm for 3-5 hours, and calcium chloride aqueous solution was added dropwise and reacted for 0.5-1 hour.

[0014] Furthermore, the solid matter comprises 15% starch, 15% dextrin, 40% bamboo charcoal powder, and 30% diatomaceous earth in terms of mass percentage, and the ratio of the mixed bacterial liquid to the solid matter is 0.5-5 mL:1 kg.

[0015] Furthermore, in the mixed aqueous solution of sodium alginate and boric acid, the mass ratio of boric acid, sodium alginate and water is 0.1:20:1000, and the mass ratio of the mixed aqueous solution to nutrients is 25:0.5~1.

[0016] Furthermore, the mass percentage concentration of the calcium chloride aqueous solution is 8-10%, and the amount of the added solution is 5-15 times the volume of the mixed bacterial solution.

[0017] Furthermore, the organic fermentation material is prepared by spraying water into crushed bamboo chips to adjust the humidity to 50-65%, then mixing with cow dung or sheep dung, adding an organic fertilizer fermentation agent to ferment to obtain the organic fermentation material, adjusting the pH of the mixture to 5.5-6.8 before fermentation, controlling the temperature to 30-40°C during fermentation, and fermenting for 5-10 days.

[0018] A method for preparing a biological compound fertilizer is characterized in that it comprises the steps of preparing a fermentation material, preparing a microbial promoter and mixing to prepare a compound fertilizer. The preparation of the microbial promoter comprises culturing the microbial agent to prepare a mixed bacterial solution, then adding solid components of starch and dextrin to mix to obtain nutrients, adding the nutrients to a mixed hydrate of sodium alginate and boric acid, then sequentially adding solid components of bamboo charcoal powder and diatomaceous earth, stirring and mixing, finally dripping a calcium chloride aqueous solution to react, filtering after the reaction, drying and crushing to obtain the microbial promoter.

[0019] Furthermore, the microorganisms used in the step of preparing the microbial promoter include phosphate-releasing bacteria, gibberellins and rhizobia, which are cultured to a concentration of 20-50×10 6 cfu / g, and then the phosphate-releasing bacteria, gibberellin and rhizobium were mixed into a mixed bacterial solution in a volume ratio of 1:0.5:0.5.

[0020] Furthermore, the solid matter comprises 15% starch, 15% dextrin, 40% bamboo charcoal powder, and 30% diatomaceous earth in terms of mass percentage, and the dosage ratio of the mixed bacterial liquid to the solid matter is 0.5-5 mL / kg.

[0021] Furthermore, in the mixed aqueous solution of sodium alginate and boric acid, the mass ratio of boric acid, sodium alginate and water is 0.1:20:1000, and the mass ratio of the mixed aqueous solution to nutrients is 25:0.5~1.

[0022] Furthermore, the mass percentage concentration of the calcium chloride aqueous solution is 8-10%, and the amount of the added solution is 5-15 times the volume of the mixed bacterial solution.

[0023] In the present invention, the inner layer particles are formed by encapsulating the calcium alginate inner layer system formed by sodium alginate and calcium chloride with microorganisms, starch and dextrin components. Since a large number of voids are formed in bamboo charcoal and diatomaceous earth, the inner layer particles are adsorbed in the voids of bamboo charcoal and diatomaceous earth, forming a double-layer embedding of the microorganisms, delaying the diffusion of the bacterial agent, thereby extending the overall fertilizer effect of the compound fertilizer. In the process of embedding, the microorganisms, starch and dextrin are first mixed with a mixed aqueous solution of sodium alginate and boric acid, first in the voids formed by bamboo charcoal and diatomaceous earth, and then calcium chloride aqueous solution is added, so that the inner layer of calcium alginate is in situ generated in the voids of bamboo charcoal and diatomaceous earth, ensuring that it can effectively form multiple protections, preventing the calcium alginate layer from being compressed by gravity or pierced by sharp objects, losing the embedding protection, losing the slow-release effect, and causing the entire fertilizer effect disorder to occur.

[0024] Furthermore, the fermentation material is prepared by mixing bamboo chips and animal manure, adjusting the humidity to 50-65%, fermenting the fermentation material, adding an organic fertilizer fermentation agent, adjusting the pH of the mixture to 5.5-6.8 before fermentation, controlling the temperature to 30-40°C, and fermenting for 5-10 days.

[0025] Furthermore, the mass ratio of the bamboo chips to animal excrement is 1:0.5-1.5, the animal excrement is cow dung or sheep dung, and the bamboo chips are bamboo and its scraps, including bamboo, bamboo leaves, bamboo branches, etc., which are obtained by crushing.

[0026] Furthermore, the step of preparing compound fertilizer by mixing is to mix and granulate the organic fermentation material and the microbial promoter in a mass ratio of 100:1-5 to form compound fertilizer.

[0027] The most specific method is a method for preparing a biocomposite fertilizer, characterized in that it comprises the following steps:

[0028] Step 1: Preparation of organic fermentation material

[0029] The bamboo and its scraps are crushed into bamboo chips with a particle size of 10-15 meshes, water is sprayed on the bamboo chips to make the water content of the bamboo chips 50-65%, and then mixed with cow dung or sheep dung, further water is added to adjust the water content to 50-65%, and then a fermentation agent is added, the pH of the mixture is adjusted to 5.5-6.8, and fermentation is carried out at 30-40° C. for 5-10 days, and then a solid is filtered and dried to a water content of 10-15% to obtain an organic fermentation material, wherein the mass ratio of bamboo chips to cow dung or sheep dung is 1:0.5-1.5, and the amount of the fermentation agent added is 0.1-0.2‰;

[0030] Step 2: Preparation of microbial promoter

[0031] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 20~50×10 6cfu / g bacterial solution, and then forming a mixed bacterial solution at a volume ratio of 1:0.5:0.5, adding solid components starch and dextrin to the mixed bacterial solution and mixing evenly to obtain nutrients, adding nutrients, solid components bamboo charcoal powder and diatomaceous earth in sequence to a mixed solution of sodium alginate and boric acid, stirring at 30-60 rpm for 3-5 hours, and then dropping a calcium chloride aqueous solution, standing for 0.5-1 hour, filtering, drying, and crushing to obtain a double-layer embedded microbial promoter, and the solid components added are divided by mass percentage. In particular, starch is 15%, dextrin is 15%, bamboo charcoal powder is 40%, and diatomaceous earth is 30%. The ratio of the mixed bacterial solution to the solid component is 0.5-5 mL / kg. The mixed aqueous solution of sodium alginate and boric acid is prepared by dissolving sodium alginate and boric acid in water. The mass ratio of boric acid, sodium alginate and water is 0.1:20:1000. The mass ratio of the mixed aqueous solution to the nutrient component is 25:0.5-1. The concentration of the calcium chloride aqueous solution is 8-12%, and the added amount accounts for 5-15 times the volume of the mixed bacterial solution.

[0032] Step 3: Synthesize compound fertilizer

[0033] The organic fermented material and the microbial promoter are mixed and granulated in a mass ratio of 100:10-30 to form a compound fertilizer.

[0034] In the formed compound fertilizer, organic fermentation materials and microbial promoters form a symbiotic system. The organic matter released from the organic fermentation materials can promote the growth and metabolism of microorganisms, and the microbial metabolism can release a large amount of nutrients, forming an organic system that slowly releases fertilizer effect. As time goes by, the coated microorganisms slowly penetrate, grow and reproduce with bamboo chips as raw materials, release nutrients, and further decompose organic matter such as bamboo chips, releasing a large amount of trace elements, promoting the healthy growth of strawberries and improving the yield and quality of strawberries.

[0035] The present invention has the following technical effects:

[0036] The double-encapsulated compound fertilizer of the present invention forms a symbiotic system by mixing organic fermentation materials and microbial promoters, which promotes the healthy growth of strawberries. The yield of strawberries can reach 3800 kg / mu, which is more than 50.51% higher than that of plots without application of biological compound fertilizers. The strawberries are uniform in size, juicy, sweet, and bright red in color. DETAILED DESCRIPTION

[0037] The present invention is described in detail below through examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above-mentioned contents of the present invention.

[0038] Example 1

[0039] A double-embedded biocomposite fertilizer is prepared according to the following steps:

[0040] Step 1: Preparation of organic fermentation material

[0041] The bamboo and its scraps are crushed into bamboo chips with a particle size of 10-15 meshes, water is sprayed on the bamboo chips to make the water content of the bamboo chips 60%, and then mixed with cow dung or sheep dung, further hydrated to adjust the water content to 60%, and then a fermentation agent is added, the pH of the mixture is adjusted to 6, and fermented at 30-40°C for 8 days, and then the solid is filtered and dried to a water content of 12% to obtain an organic fermentation material, wherein the mass ratio of bamboo chips to cow dung is 1:1, and the amount of the fermentation agent added is 0.2‰; the fermentation agent is a commercially available product purchased from Luoyang Ouke Biotechnology Co., Ltd.;

[0042] Step 2: Preparation of microbial promoter

[0043] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 30×10 6 cfu / g of bacterial liquid, and then forming a mixed bacterial liquid at a volume ratio of 1:0.5:0.5, adding solid components starch and dextrin to the mixed bacterial liquid and mixing evenly to obtain nutrients, adding nutrients, solid components bamboo charcoal powder and diatomaceous earth in sequence to the mixed solution of sodium alginate and boric acid, stirring at 50 rpm for 4 hours, and then dropping calcium chloride aqueous solution, after standing for 0.5 hours, filtering, drying, and crushing to obtain a double-layer embedded microbial promoter, in terms of mass percentage, the added solid components are respectively The content of starch is 15%, the content of dextrin is 15%, the content of bamboo charcoal powder is 40%, and the content of diatomaceous earth is 30%. The ratio of the mixed bacterial solution to the solid component is 4 mL / kg. The mixed aqueous solution of sodium alginate and boric acid is prepared by dissolving sodium alginate and boric acid in water. The mass ratio of boric acid, sodium alginate and water is 0.1:20:1000. The mass ratio of the mixed aqueous solution to the mixed bacterial solution is 25:0.8. The concentration of the calcium chloride aqueous solution is 2%, and the added amount accounts for 0.05% of the volume of the mixed bacterial solution.

[0044] Step 3: Synthesize compound fertilizer

[0045] The organic fermented material and the microbial promoter are mixed and granulated in a mass ratio of 100:4 to form a compound fertilizer.

[0046] Comparative Example 1:

[0047] Compared with Example 1, in this scheme, the mixed aqueous solution of sodium alginate and boric acid is not added when preparing the microbial promoter, and the remaining steps are the same. The specific steps of preparing the microbial promoter are as follows:

[0048] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 30×10 6 cfu / g of bacterial liquid, and then forming a mixed bacterial liquid at a volume ratio of 1:0.5:0.5, adding solid components starch and dextrin to the mixed bacterial liquid and mixing them evenly to obtain nutrients, adding nutrients, solid components bamboo charcoal powder and diatomaceous earth to water in sequence, stirring at 50rpm for 4h, then dropping calcium chloride aqueous solution, standing for 0.5h, filtering, drying and crushing to obtain a double-layer embedded microbial promoter, according to mass percentage, the added solid components are 15% starch, 15% dextrin, 40% bamboo charcoal powder, and 30% diatomaceous earth, the dosage ratio of the mixed bacterial liquid to the solid component is 4mL / kg, the mass ratio of the water to the nutrient component is 25:0.8, and the concentration of the calcium chloride aqueous solution is 2%. The percentage of the added amount to the volume of the bacterial liquid is 0.05%.

[0049] Comparative Example 2:

[0050] Compared with Example 1, in the step of preparing the nutrition promoter in this scheme, the calcium chloride aqueous solution is first added together with the nutrient components to the mixed aqueous solution of sodium alginate and boric acid for reaction, and the steps adopted are as follows:

[0051] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 30×10 6 cfu / g of bacterial liquid, and then forming a mixed bacterial liquid at a volume ratio of 1:0.5:0.5, adding solid components of starch and dextrin to the mixed bacterial liquid and mixing evenly to obtain nutrients, adding nutrients and calcium chloride aqueous solution in sequence to the mixed solution of sodium alginate and boric acid, after standing for 0.5h, adding solid components of bamboo charcoal powder and diatomaceous earth, stirring at 50rpm for 4h, filtering, drying, and crushing to obtain a double-layer embedded microbial promoter, wherein the solid components added are starch, dextrin ... The powder is 15%, the dextrin is 15%, the bamboo charcoal powder is 40%, and the diatomaceous earth is 30%. The dosage ratio of the mixed bacterial liquid to the solid component is 4 mL / kg. The mixed aqueous solution of sodium alginate and boric acid is prepared by dissolving sodium alginate and boric acid in water. The mass ratio of boric acid, sodium alginate and water is 0.1:20:1000. The mass ratio of the mixed aqueous solution to the mixed bacterial liquid is 25:0.8. The concentration of the calcium chloride aqueous solution is 2%, and the added amount accounts for 0.05% of the volume of the mixed bacterial liquid.

[0052] The remaining steps are consistent with those in Example 1.

[0053] The biocomposite fertilizers prepared in Example 1, Comparative Example 1 and Comparative Example 2 were applied to soil planted with strawberries, and the changes in the organic matter and probiotic contents over time were detected.

[0054] The plate count method was used to detect phospholytic bacteria, Gibberella and Rhizobium:

[0055] The soil sample was diluted in a gradient manner and evenly dispersed in the soil suspension. The microorganisms in the soil were fully dispersed into single cells. A certain amount of soil suspension was mixed with the pre-solidification culture medium, or evenly spread on the solidified plate culture medium. Single cells grew and multiplied to form colonies visible to the naked eye. Then, the number of microorganisms in the soil was calculated based on the number of colonies formed, the dilution multiple, and the sampling volume. The test results are shown in Table 1.

[0056] Table 1 Changes of organic matter and beneficial microorganisms in soil after fertilization

[0057]

[0058] It can be seen that the organic matter in the soil increases significantly after the application of compound fertilizer. As time goes by, the organic matter in the soil shows a downward trend, including strawberry growth consumption and microbial consumption. After 60 days of fertilization, the organic matter in the present invention can still be maintained at more than 50g / kg, while Comparative Examples 1 and 2 both drop to the level before fertilization. After the application of compound fertilizer, phosphate-releasing bacteria, gibberellins and rhizobia show a trend of increasing and then decreasing over time. In the present invention, the probiotics are in a process of slow increase and decrease in the soil, maintaining the probiotics in the soil at a relatively high stable concentration. In Comparative Examples 1 and 2, due to the poor slow release effect in the early stage and excessive diffusion of microorganisms, the ecological system between microorganisms and organic matter and soil environment is unbalanced, and it is difficult to form a good balance relationship, which makes the probiotics rapidly decay in the future, and drops to single digits after 60 days of fertilization.

[0059] Example 2

[0060] A double-embedded biocomposite fertilizer is prepared according to the following steps:

[0061] Step 1: Preparation of organic fermentation material

[0062] The bamboo and its scraps are crushed into bamboo chips with a particle size of 10-15 meshes, water is sprayed on the bamboo chips to make the water content of the bamboo chips 50%, and then mixed with cow dung or sheep dung, further water is added to adjust the water content to 50%, and then a fermentation agent is added, and the pH of the mixture is adjusted to 6.8, and fermentation is carried out at 30-40°C for 5 days, and then the solid is filtered and dried to a water content of 10-15% to obtain an organic fermentation material, wherein the mass ratio of bamboo chips to cow dung is 1: 1.5, and the amount of the fermentation agent added is 0.2‰;

[0063] Step 2: Preparation of microbial promoter

[0064] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 20×106 cfu / g of bacterial liquid, and then forming a mixed bacterial liquid in a volume ratio of 1:0.5:0.5, adding starch and dextrin to the mixed bacterial liquid and mixing evenly to obtain nutrients, adding nutrients, bamboo charcoal powder and diatomaceous earth in sequence to the mixed solution of sodium alginate and boric acid, stirring at 60rpm for 3h, and then dropping a calcium chloride aqueous solution, standing for 0.5h, filtering, drying and crushing to obtain a double-layer embedded microbial promoter, in terms of mass percentage, the added solid components are 15% starch, 15% dextrin, 40% bamboo charcoal powder, and 30% diatomaceous earth, and the dosage ratio of the mixed bacterial liquid to the solid component is 5mL / kg, the mixed aqueous solution of sodium alginate and boric acid is prepared by dissolving sodium alginate and boric acid in water, the mass ratio of boric acid, sodium alginate and water is 0.1:20:1000, the mass ratio of the mixed aqueous solution to the mixed bacterial liquid is 25:0.5, the concentration of the calcium chloride aqueous solution is 2%, and the added amount accounts for 0.1% of the volume of the mixed bacterial liquid;

[0065] Step 3: Synthesize compound fertilizer

[0066] The organic fermented material and the microbial promoter are mixed and granulated in a mass ratio of 100:1-5 to form a compound fertilizer.

[0067] Example 3

[0068] A double-embedded biocomposite fertilizer is prepared according to the following steps:

[0069] Step 1: Preparation of organic fermentation material

[0070] The bamboo and its scraps are crushed into bamboo chips with a particle size of 10-15 meshes, water is sprayed on the bamboo chips to make the water content of the bamboo chips 65%, and then mixed with cow dung or sheep dung, further watered to adjust the water content to 65%, and then fermentation agents are added, the pH of the mixture is adjusted to 5.5, and fermentation is carried out at 30-40°C for 10 days, and then solids are filtered and dried to a water content of 10-15% to obtain organic fermentation materials, wherein the mass ratio of bamboo chips to cow dung is 1:0.5, and the amount of fermentation agents added is 0.1‰;

[0071] Step 2: Preparation of microbial promoter

[0072] Take the microbial agents phosphate-removing bacteria, Gibberellic acid and Rhizobium and culture them to a concentration of 50×10 6cfu / g of bacterial liquid, and then forming a mixed bacterial liquid at a volume ratio of 1:0.5:0.5, adding starch and dextrin to the mixed bacterial liquid and mixing evenly to obtain nutrients, adding nutrients, bamboo charcoal powder and diatomaceous earth in sequence to the mixed solution of sodium alginate and boric acid, stirring at 30rpm for 5h, and then dropping calcium chloride aqueous solution, standing for 1h, filtering, drying and crushing to obtain a double-layer embedded microbial promoter, in terms of mass percentage, the added solid components are 15% starch, 15% dextrin, 40% bamboo charcoal powder, and 30% diatomaceous earth, and the dosage ratio of the mixed bacterial liquid to the solid component is 0.5mL / kg, the mixed aqueous solution of sodium alginate and boric acid is prepared by dissolving sodium alginate and boric acid in water, the mass ratio of boric acid, sodium alginate and water is 0.1:20:1000, the mass ratio of the mixed aqueous solution to the mixed bacterial liquid is 25:1, the concentration of the calcium chloride aqueous solution is 2%, and the addition amount accounts for 0.01% of the volume of the mixed bacterial liquid;

[0073] Step 3: Synthesize compound fertilizer

[0074] The organic fermented material and the microbial promoter are mixed and granulated in a mass ratio of 100:1-5 to form a compound fertilizer.

[0075] The biocomposite fertilizer prepared in the above-mentioned Examples 1-3, Comparative Example 1 and Comparative Example 2 is applied during the growth of strawberries. The specific application method is as follows:

[0076] The compound fertilizer was placed around the root soil of the strawberry planted, 80~100 kg per mu. More than 5 parallel tests were carried out for each group of biological compound fertilizers. The average strawberry yield was finally obtained as shown in Table 2.

[0077] Table 2: Effects of different bio-compound fertilizers on strawberry yield

[0078]

[0079] It can be seen that after applying the biocomposite fertilizer prepared by the present invention, the yield of strawberries is maintained between 3800 and 3900 kg / mu, which is more than 50.51% higher than that of the Ck group, while in the plots of composite biochar prepared by comparative examples 1 and 2, the strawberry yield is only 2900 to 3300 kg / mu, with an increase of 22.74% and 28.17%, respectively. It can be seen that the microbial agent diffuses outward quickly, disrupting the release of fertilizer effect in the soil, resulting in a short duration of fertilizer effect. In the present invention, by double embedding, the diffusion speed of the microbial agent is delayed, and the effect of the biocomposite fertilizer in the soil is adjusted by the interaction between microorganisms and organic matter, thereby extending the time of fertilizer effect, which is more suitable for the long-term growth of strawberries, and increases the yield of strawberries while improving the fruit quality of strawberries.

Claims

1. A double-embedded biological compound fertilizer, characterized in that: The biological compound fertilizer is prepared by fermenting bamboo scraps and animal feces to prepare organic fermentation materials, and then the organic fermentation materials and microbial promoters are mixed to prepare compound fertilizers. The microbial promoter is prepared by culturing microbial agents to prepare mixed bacterial liquid, and then adding solid starch and dextrin to mix to obtain nutrients, adding the nutrients to a mixed aqueous solution of sodium alginate and boric acid, and then adding solid bamboo charcoal powder and diatomaceous earth in sequence, and finally adding calcium chloride aqueous solution to react, filtering after the reaction is completed, drying and crushing to obtain the mixed aqueous solution of sodium alginate and boric acid, the mass ratio of boric acid, sodium alginate and water is 0.1:20:1000, the mass ratio of the mixed aqueous solution to the nutrients is 25:0.5-1, and the microorganisms in the microbial promoter include phosphate degrading bacteria, gibberellin and rhizobium, which are cultured to a concentration of 20-50×10 6 cfu / g, and then the phosphate-releasing bacteria, gibberellin and rhizobium were mixed into a mixed bacterial solution in a volume ratio of 1:0.5:0.

5.

2. A double-embedded biocomposite fertilizer as claimed in claim 1, characterized in that: The mass ratio of the bamboo chips to the animal excrement is 1:0.5-1.5, the bamboo chips are obtained by crushing bamboo, bamboo leaves and bamboo branches, and the animal excrement is cow dung or sheep dung.

3. A double-embedded biological compound fertilizer as claimed in claim 1 or 2, characterized in that: The mass ratio of the starch, dextrin, bamboo charcoal powder and diatomaceous earth is 0.15:015:0.4:0.3, and the dosage ratio of the total of starch, dextrin, bamboo charcoal powder and diatomaceous earth to the mixed bacterial liquid is 1 kg: 0.5-5 mL.

4. A double-embedded biological compound fertilizer as claimed in claim 3, characterized in that: After adding bamboo charcoal powder and diatomaceous earth, stir at 30-60 rpm for 3-5 hours, add calcium chloride aqueous solution and react for 0.5-1 hour.

5. A double-embedded biological compound fertilizer as claimed in claim 4, characterized in that: The mass percentage concentration of the calcium chloride aqueous solution is 8-10%, and the amount added is 5-15 times the volume of the mixed bacterial solution.

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