Composite wormcast organic fertilizer for improving fertility and structure of soil and method

Abstract

The invention discloses a composite wormcast organic fertilizer for improving soil fertility and structure and a method, belongs to the technical field of organic fertilizer preparation, and aims to solve the problems of unstable fertilizer efficiency, difficulty in quality control, potential negative ecological effect and single function of the existing composite wormcast organic fertilizer. The organic fertilizer comprises the following raw material components in parts by weight: 40-60 parts of wormcast, 20-30 parts of a decomposed organic material, 3-5 parts of a functional microbial agent, 5-10 parts of a mineral additive and 2-5 parts of a conditioner. The preparation method comprises the steps of raw material pretreatment, segmented mixing, functional bacterium inoculation and low-temperature drying at 40-45 DEG C. The application amount is 200-300 kg / mu, soil organic matter can be increased, the granular structure can be improved, the fertilizer efficiency is stable, the safety is high, the concept of resource circulation is met, and the fertilizer is suitable for large-scale production and popularization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic fertilizer preparation, in particular to a compound earthworm manure organic fertilizer for improving soil fertility and structure and a method thereof. BACKGROUND

[0002] At present, the application of earthworm manure organic fertilizer in the field of agriculture is gradually widespread, and it is often used to improve different types of soil, such as coastal saline-alkali soil and red soil, and has a certain promoting effect on the growth of various crops. Moreover, the earthworm manure organic fertilizer is usually made of organic waste such as crop straw, livestock and poultry manure, and sludge, which conforms to the concept of resource recycling. Meanwhile, it is also a common direction to make compound fertilizer by mixing earthworm manure with chemical fertilizer, micro-fertilizer, and microbial fertilizer. However, the existing technology has obvious defects: first, the stability of the fertilizer effect is poor. Due to the different earthworm varieties, consumed organic materials, and digestion degrees, the physicochemical properties of earthworm manure are quite different, which leads to unbalanced nutrients and unstable fertilizer effect of the finished compound organic fertilizer; second, the quality control is difficult. Microorganisms are the key to the function of the product, but in most products, the survival of effective bacteria is less than one year. The quality of products on the market is uneven, and the detection of effective viable bacteria and other indicators requires professional equipment, which is difficult to control; third, there are potential negative ecological effects. If sludge containing heavy metals is used as raw material, the earthworm manure may carry heavy metals and accumulate in the soil, which may harm crops. There may also be harmful microorganisms or excessive organic acids, which may affect seed germination and seedling growth. SUMMARY

[0003] The present application aims to solve the problems of poor stability of the fertilizer effect, difficult quality control, potential negative ecological effects, and single function of the existing compound earthworm manure organic fertilizer. Through scientific raw material ratio and optimized preparation process, the present application provides a compound earthworm manure organic fertilizer and a method thereof, which can effectively improve soil fertility and structure, and has stable fertilizer effect, high safety, and comprehensive function.

[0004] The present application is achieved by the following technical solutions: In a first aspect, the present application provides a compound earthworm manure organic fertilizer for improving soil fertility and structure, which comprises the following raw material components by weight: 40-60 parts of earthworm manure, 20-30 parts of decomposed organic material, 3-5 parts of functional microbial agent, 5-10 parts of mineral additive, and 2-5 parts of conditioning agent.

[0005] As a preferred technical solution of the present application, the earthworm manure is the excrement produced by red earthworms or William's ringworms, which feeds on crop straw and livestock and poultry manure. The excrement is treated to have a water content of 20-25%, and is crushed to pass through an 80-100 mesh sieve.

[0006] Further preferably, the dry weight ratio of the crop straw to the livestock and poultry manure is (1.5-2):1.

[0007] The earthworm manure prepared by the above scheme is rich in natural organic matter, humic acid and basic nutrients, and the porous structure can improve the soil permeability and water retention.

[0008] As a preferred technical solution of the present application, the mature organic material includes garden fallen leaves, kitchen waste and edible mushroom residue, and is high-temperature aerobic composted to a maturity of ≥80% and an organic matter content of ≥45%.

[0009] Further preferably, the mass ratio of the garden fallen leaves, kitchen waste and edible mushroom residue is 2:1:1.

[0010] As a preferred technical solution of the present application, the high-temperature temperature is 55-65°C, the composting time is 15-20 days, and the oxygen flow is 0.05-0.2 m 3 / (m 3 h).

[0011] The mature organic material prepared by the above scheme can complement soil organic matter in cooperation with earthworm manure, and high-temperature composting can kill pathogenic bacteria and weed seeds. The oxygen flow meets the metabolic needs of microorganisms in aerobic fermentation, which can ensure the complete degradation of organic material and the killing of pathogenic bacteria, while avoiding excessive aeration to increase energy consumption.

[0012] As a preferred technical solution of the present application, the functional microbial agent includes Bacillus subtilis, phosphorus and potassium solubilizing bacteria and Bacillus mucilaginosus, and the total viable count is ≥2.0×10 9 CFU / g.

[0013] Further preferably, the viable count ratio of the Bacillus subtilis, phosphorus and potassium solubilizing bacteria and Bacillus mucilaginosus is 2:1:1.

[0014] In the above scheme, Bacillus subtilis can inhibit soil-borne diseases, phosphorus and potassium solubilizing bacteria can improve the availability of phosphorus and potassium elements in the soil, and Bacillus mucilaginosus can promote the formation of soil aggregate structure.

[0015] As a preferred technical solution of the present application, the mineral additive includes zeolite powder, bentonite and dolomite powder, and the particle size is 100-120 mesh.

[0016] Further preferably, the mass ratio of the zeolite powder, bentonite and dolomite powder is 3:2:1.

[0017] In the above scheme, zeolite powder and bentonite have adsorption properties, which can preserve fertilizer and water, and adjust soil pH value; dolomite powder can supplement calcium and magnesium elements, and improve soil physicochemical properties.

[0018] As a preferred technical solution of the present application, the conditioning agent includes humic acid and amino acid chelate, wherein the humic acid content is ≥60% and the total amino acid content is ≥30%.

[0019] Further preferably, the mass ratio of the humic acid and amino acid chelate is 3:2.

[0020] In the above scheme, the humic acid can promote the formation of soil aggregate structure, the amino acid chelate provides readily available nutrients for crops, and the fertilizer utilization rate is improved.

[0021] In a second aspect, the present application provides a method for preparing the composite earthworm manure organic fertilizer, comprising the following steps: Raw material pretreatment: the earthworm manure is dried, crushed and sieved according to requirements, the composted organic material is crushed, the mineral additives and conditioners are dried respectively, and are ready for use; Segmented mixing: the earthworm manure and the composted organic material are first added to a mixing machine, and are stirred at room temperature until they are uniformly mixed to obtain a base mixture; Functional bacteria inoculation: the functional microorganism inoculum is diluted and uniformly sprayed on the base mixture while stirring; Mineral and conditioner addition: the mineral additives and conditioners are added to the material after functional bacteria inoculation, and are stirred until they are uniformly mixed to obtain a composite material; Low-temperature drying: the composite material is placed in a low-temperature drying device for drying, and intermittent stirring is adopted during the drying process, thereby obtaining the composite earthworm manure organic fertilizer product.

[0022] As a preferred technical solution of the present application, in the raw material pretreatment, the composted organic material is crushed to a particle size of ≤5mm, and the mineral additives and conditioners are dried to a water content of ≤10%; in the functional bacteria inoculation, the functional microorganism inoculum is diluted 10-20 times with sterile water having a pH value of 6.5-7.5, and the water content of the base mixture is controlled to be 30-35%; in the low-temperature drying, the drying temperature is 40-45℃, and the water content is dried to 15-20%.

[0023] In a third aspect, the present application provides a soil improvement method, which applies the composite earthworm manure organic fertilizer as described above to improve the soil organic matter content, improve the soil aggregate structure, and enhance the soil air permeability and water retention.

[0024] Further preferably, the application amount of the composite earthworm manure organic fertilizer is 200-300 kg / acre.

[0025] Compared with the prior art, the specific technical effects of the present application are summarized as follows: 1. Scientific and synergistic formula, realizing comprehensive improvement of soil fertility and structure The present application breaks through the limitation of single function of existing products by forming high-efficiency synergies among components through specific ratio of each raw material component and strict processing requirements. Specifically, 40-60 parts of earthworm manure (red aphaerogonosus or william ringworms) is taken as the basis, which is fed with crop straw and livestock manure at a dry weight ratio of 1.5-2:1, and is processed to a moisture content of 20-25% and passed through an 80-100 mesh screen, and then 20-30 parts of garden fallen leaves, kitchen waste and edible mushroom residues (mass ratio 2:1:1, composting degree ≥80%) which are high-temperature aerobic composted for 15-20 days (oxygen flow 0.05-0.2 m 3 / (m 3 ·h) at 55-65°C are added to form a synergistic effect of supplementing soil organic matter, and the high-temperature composting can kill pathogenic bacteria and weed seeds to avoid the influence of harmful microorganisms on crops. At the same time, 3-5 parts of functional microbial inoculum containing bacillus subtilis, phosphorus and potassium solubilizing bacteria, and bacillus mucilaginosus (live bacteria ratio 2:1:1, total live bacteria ≥2.0 x 10 9 CFU / g) can respectively achieve the functions of inhibiting soil-borne diseases, improving the availability of phosphorus and potassium elements, and promoting the formation of soil aggregate structure; 5-10 parts of 100-120 mesh zeolite powder, bentonite and dolomite powder (mass ratio 3:2:1) can adsorb and retain fertilizer and water, adjust pH value and supplement calcium and magnesium elements; 2-5 parts of conditioning agent containing humic acid (≥60%) and amino acid chelate (≥30%, mass ratio 3:2) can further promote the formation of aggregate structure and provide available nutrients, ultimately achieving the multiple effects of improving fertility, improving structure, inhibiting diseases and providing nutrients.

[0026] 2. Process optimization is accurate, which ensures stable fertilizer efficiency and facilitates quality control The present application effectively solves the problems of low microbial activity and unstable fertilizer efficiency of existing products through a segmented preparation process and low-temperature drying control. On the one hand, the process of segmented mixing → functional bacteria inoculation → mineral and conditioning agent addition is adopted: the earthworm manure and composted organic material are mixed at room temperature to form a basic mixture, then the functional microbial inoculum is diluted 10-20 times with sterile water at pH 6.5-7.5 and sprayed (the moisture content of the basic mixture is controlled at 30-35%), and finally the mineral additive and conditioning agent are added to avoid the inactivation of functional microorganisms due to early contact with other components, and to ensure the survival efficiency of effective bacteria. On the other hand, the drying link adopts low temperature of 40-45°C with intermittent stirring to dry the compound material to a moisture content of 15-20%, which not only avoids the destruction of nutrients and microbial activity by high temperature, but also ensures the uniformity of drying through intermittent stirring, so that the nutrient content and live bacteria number of the finished product are stable and controllable, reducing the difficulty of quality control (without excessive dependence on professional equipment, the core indicators can be controlled through routine detection).

[0027] 3. Strict selection of raw materials reduces potential ecological risk and meets resource recycling The application strictly limits the source and processing method of raw materials, reduces negative ecological effects, and practices the concept of resource recycling. In the selection of raw materials, it is clear that earthworm manure needs crop straw and livestock and poultry manure as food (not sludge containing heavy metals), to avoid the accumulation of heavy metals in the soil from the source; the composted organic material uses organic waste such as garden leaves and kitchen waste, realizes waste resource utilization, and meets the demand of green agriculture. At the same time, each raw material needs to be treated: the earthworm manure is dried, crushed and sieved, the composted organic material is crushed to a particle size of ≤5mm, the mineral additive and the conditioner are dried to a water content of ≤10%, these treatments not only improve the compatibility and uniformity of the raw materials, but also further remove impurities or harmful components (such as excessive organic acid) that may exist in the raw materials, to avoid affecting seed germination and seedling growth, and to ensure application safety.

[0028] 4. The application effect is clear, suitable for large-scale promotion and high improvement efficiency The compound earthworm manure organic fertilizer provided by the application has a clear application scene and quantitative effect, and is convenient for large-scale agricultural production promotion. In application, the application amount is 200-300 kg / mu, which can be directly used to improve the soil organic matter content, improve the soil aggregate structure, and enhance the soil permeability and water retention, with significant and stable effect. In addition, the raw materials are widely available (crop straw, livestock and poultry manure, garden waste, etc.), and the preparation process does not require special complex equipment (mixing machine, low-temperature drying equipment is a conventional agricultural processing equipment), which can meet the production needs of different scales and has the feasibility of large-scale promotion. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present application, the preferred embodiments of the present application are described below in combination with specific examples, but it should not be understood as limiting the present patent, but only as an example.

[0030] The test methods or test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0031] All raw materials in the embodiments of the present application are market known, commercially available chemical raw materials unless otherwise specified.

[0032] Example 1 The present embodiment provides a compound earthworm manure organic fertilizer for improving soil fertility and structure, which comprises the following raw material components by weight: earthworm manure 50 parts, composted organic material 25 parts, functional microbial agent 4 parts, mineral additive 7 parts, conditioner 3 parts.

[0033] The earthworm manure is produced by red earthworms with crop straw and cow dung as food, and is treated to have a water content of 22% and is crushed to pass through a 90-mesh screen. The dry weight ratio of the crop straw to the cow dung is 1.7:1.

[0034] The composted organic material includes garden fallen leaves, kitchen waste and edible mushroom residue, and is composted at high temperature and in an aerobic manner to have a composting degree of 85% and an organic matter content of 50%. The mass ratio of the garden fallen leaves, the kitchen waste and the edible mushroom residue is 2:1:1. The high temperature is 60℃, the composting time is 17 days, and the oxygen supply amount is 0.1 m 3 / (m 3 h).

[0035] The functional microbial agent includes Bacillus subtilis, phosphorus and potassium solubilizing bacteria and Bacillus mucilaginosus, and has a total viable bacterial count of 2.2×10 9 CFU / g. The viable bacterial count ratio of the Bacillus subtilis, the phosphorus and potassium solubilizing bacteria and the Bacillus mucilaginosus is 2:1:1.

[0036] The mineral additive includes zeolite powder, bentonite and dolomite powder, and has a particle size of 110 mesh. The mass ratio of the zeolite powder, the bentonite and the dolomite powder is 3:2:1.

[0037] The conditioner includes humic acid and amino acid chelate, wherein the humic acid content is 60% and the total amino acid content is 30%. The mass ratio of the humic acid to the amino acid chelate is 3:2.

[0038] The preparation method of the compound earthworm manure organic fertilizer for improving soil fertility and structure includes the following steps: (1) Raw material pretreatment: the earthworm manure is dried, crushed and sieved according to requirements; the composted organic material is crushed to have a particle size of ≤5 mm; the mineral additive and the conditioner are dried to have a water content of 8% respectively and are reserved.

[0039] (2) Subsection mixing: the earthworm manure and the composted organic material are first added into a mixing machine, and are stirred at room temperature for 18 minutes until they are uniformly mixed to obtain a base mixture.

[0040] (3) Functional bacteria inoculation: the functional microbial agent is diluted 15 times with sterile water having a pH value of 7.0, and is uniformly sprayed on the base mixture while stirring to control the water content of the mixture to be 32%, and the stirring is continued for 12 minutes. The diluted agent needs to be used up within 2 hours.

[0041] (4) Mineral and conditioner addition: the mineral additive and the conditioner are added into the material obtained in step (3), and are stirred for 25 minutes until the components are uniformly mixed to obtain a compound material.

[0042] (5) Low temperature drying: the compound material is placed in a low temperature drying device and dried at 42°C to a moisture content of 18%. Intermittent stirring is used during the drying process, with stirring every 30 minutes for 5 minutes each time, to obtain the compound earthworm manure organic fertilizer product.

[0043] (6) Quality inspection and packaging: the product is subjected to nutrient content and viable bacterial count detection, and is packaged after passing the inspection.

[0044] Example 2 The present example provides a compound earthworm manure organic fertilizer for improving soil fertility and structure, comprising the following raw material components by weight: earthworm manure 40 parts, composted organic material 20 parts, functional microbial agent 3 parts, mineral additive 5 parts, conditioning agent 2 parts.

[0045] The earthworm manure is the excrement of the Eisenia fetida fed on crop straw and sheep manure, which is treated to a moisture content of 20% and ground to pass through an 80-mesh sieve. The dry weight ratio of the crop straw to the sheep manure is 1.5:1.

[0046] The composted organic material includes garden fallen leaves, kitchen waste and edible mushroom residue (mass ratio 2:1:1), which is high-temperature aerobic composted to a composting degree of 80% and an organic matter content of 45%. The high-temperature temperature is 55°C, the composting time is 15 days, and the oxygen flow is 0.05 m 3 / (m 3 h).

[0047] The functional microbial agent includes Bacillus subtilis, phosphorus and potassium solubilizing bacteria and Bacillus mucilaginosus (viable bacterial count ratio 2:1:1), with a total viable bacterial count of 2.0 x 10 9 CFU / g.

[0048] The mineral additive includes zeolite powder, bentonite and dolomite powder (mass ratio 3:2:1), with a particle size of 100 mesh.

[0049] The conditioning agent includes humic acid and amino acid chelate (mass ratio 3:2), with a humic acid content of 60% and a total amino acid content of 30%.

[0050] The preparation method is as follows: Raw material pretreatment: the earthworm manure is dried and ground to pass through an 80-mesh sieve; the composted organic material is broken to a particle size of ≤5 mm; the mineral additive and the conditioning agent are dried to a moisture content of 10% and reserved.

[0051] Sectional mixing: the earthworm manure and the composted organic material are added to a mixing machine and stirred at room temperature for 15 minutes to obtain a base mixture.

[0052] Inoculation of functional bacteria: dilute the functional microbial inoculant 10 times with sterile water at pH 6.5, evenly spray it on the base mixture, stir while spraying, control the moisture content to be 30%, continue stirring for 10 minutes, and use the diluted inoculant within 2 hours.

[0053] Mineral and conditioner addition: add mineral additives and conditioners, stir for 20 minutes to uniform, obtain the compound material.

[0054] Low-temperature drying: place the compound material in a low-temperature drying equipment at 40℃, dry to a moisture content of 15%, and intermittently stir (stir for 5 minutes every 30 minutes) during the drying process, to obtain the finished product.

[0055] Quality inspection and packaging: after the nutrient content and viable bacterial count are qualified, package and seal.

[0056] Example 3 The present embodiment provides a compound earthworm manure organic fertilizer for improving soil fertility and structure, which comprises the following raw material components by weight: earthworm manure 60 parts, composted organic material 30 parts, functional microbial inoculant 5 parts, mineral additive 10 parts, and conditioner 5 parts.

[0057] The earthworm manure is the excrement produced by the earthworm Eisenia foetida fed on crop straw and pig manure, which is treated to a moisture content of 25% and crushed to pass through a 100-mesh sieve. The dry weight ratio of crop straw to pig manure is 2:1.

[0058] The composted organic material includes garden fallen leaves, kitchen waste, and edible mushroom residue (mass ratio 2:1:1), which is high-temperature aerobic composted to a composting degree of 85% and an organic matter content of 50%. The high-temperature temperature is 65℃, the composting time is 20 days, and the oxygen flow rate is 0.2 m 3 / (m 3 h).

[0059] The functional microbial inoculant includes Bacillus subtilis, phosphorus and potassium solubilizing bacteria, and Bacillus mucilaginosus (viable bacterial count ratio 2:1:1), with a total viable bacterial count of 2.1 x 10 9 CFU / g.

[0060] The mineral additive includes zeolite powder, bentonite, and dolomite powder (mass ratio 3:2:1), with a particle size of 120 mesh.

[0061] The conditioner includes humic acid and amino acid chelate (mass ratio 3:2), with a humic acid content of 60% and a total amino acid content of 30%.

[0062] The preparation method is as follows: Raw material pretreatment: the earthworm manure is dried and crushed to pass through a 100-mesh sieve; the composted organic material is broken to a particle size of ≤5 mm; the mineral additive and the conditioner are dried to a moisture content of 8% respectively and ready for use.

[0063] Segmented mixing: Add earthworm manure and decomposed organic material into a mixer, stir at room temperature for 20 minutes to uniform, get the base mixture.

[0064] Functional bacteria inoculation: Dilute the functional microbial inoculant 20 times with sterile water at pH 7.5, evenly spray on the base mixture, spray and stir, control the moisture content to 35%, continue to stir for 15 minutes, dilute the inoculant within 2 hours.

[0065] Mineral and conditioner addition: Add mineral additives and conditioners, stir for 30 minutes to uniform, get the compound material.

[0066] Low temperature drying: Place the compound material in a low temperature drying equipment at 45℃, dry to moisture content 20%, intermittent stirring (stir for 5 minutes every 30 minutes) during drying, get the finished product.

[0067] Quality inspection and packaging: After detecting the nutrient content and viable count, pack and seal.

[0068] Comparative Example 1 This comparative example only uses garden fallen leaves as organic material, the rest is the same as Example 1.

[0069] Comparative Example 2 This comparative example uses garden fallen leaves and kitchen waste as organic material with a mass ratio of 2:1, the rest is the same as Example 1.

[0070] Comparative Example 3 This comparative example only uses Bacillus subtilis as functional microbial inoculant, the rest is the same as Example 1.

[0071] Comparative Example 4 This comparative example uses Bacillus subtilis and phosphorus and potassium solubilizing bacteria as functional microbial inoculants with a viable count ratio of 2:1, the rest is the same as Example 1.

[0072] Comparative Example 5 This comparative example only uses zeolite powder as mineral additive, the rest is the same as Example 1.

[0073] Comparative Example 6 This comparative example uses zeolite powder and bentonite as mineral additives with a mass ratio of 3:2, the rest is the same as Example 1.

[0074] Comparative Example 7 This comparative example only uses humic acid as conditioner, the rest is the same as Example 1.

[0075] Comparative Example 8 This comparative example only uses amino acid chelate as conditioner, the rest is the same as Example 1.

[0076] Comparative Example 9 The comparative example adopts a one-time mixing process, and the rest is the same as Example 1, and the specific process difference is as follows: Mixing method: earthworm manure, mature organic material, functional microbial agent, mineral additive, conditioner are added into the mixer at one time, and stirred at room temperature for 25 minutes until uniform, without segmented mixing + functional bacteria inoculation, and then add mineral and conditioner.

[0077] Comparative Example 10 The comparative example adopts a high-temperature drying process, and the rest is the same as Example 1, and the specific process difference is as follows: Drying method: the mixed material is placed in a 70°C high-temperature drying device, and continuously dried to a moisture content of 18%, without using 40-45°C low temperature + intermittent stirring process.

[0078] The compound earthworm manure organic fertilizer prepared in each of the above examples and comparative examples is applied to the same poor soil improvement at 250 kg / acre, and the soil organic matter content, soil aggregate structure, air permeability and water retention are detected after 30 days, as shown in Table 1 below.

[0079] Table 1 The improved soil is applied to crop planting, and the yield and soil-borne disease incidence are tested, as shown in Table 2 below.

[0080] Table 2 The improvement rate of each index in Table 1 and Table 2 refers to the improvement rate relative to the poor soil without any treatment, and the reduction rate refers to the reduction rate relative to the poor soil without any treatment.

[0081] From the data in Table 1 and Table 2, it can be seen that the compound earthworm manure organic fertilizer provided by the present application has a significant effect on improving soil fertility and structure. Examples 1, 2 and 3 all show a high soil organic matter content improvement rate, air permeability improvement rate, water retention improvement rate, and soil aggregate structure improvement, as well as obvious crop yield improvement and soil-borne disease reduction effect. Among them, Example 1 has the best effect, and Examples 2 and 3 have slightly less effect but are still good, indicating that the present application can work effectively within a wide range of parameters.

[0082] Compared with the comparative examples, the advantages of the embodiments are obvious: Comparative Examples 1 and 2 (single or incomplete organic materials) have poor effects, which illustrates the importance of the synergistic effect of multiple organic materials. Comparative Examples 3 and 4 (incomplete functional microbial agents) are insufficient in soil-borne disease inhibition and soil structure improvement, highlighting the necessity of multiple microbial synergies. Comparative Examples 5 and 6 (incomplete mineral additives) are weak in water and fertilizer retention and soil physical and chemical property improvement, emphasizing the comprehensive role of mineral additives. Comparative Example 7 and Comparative Example 8 (incomplete conditioning agents) have defects in providing available nutrients or forming soil aggregate structure, indicating the key balance of the conditioning agent. Comparative Example 9 and Comparative Example 10 (insufficient process optimization) have a significant decrease in effect, confirming the importance of the segmented mixing and low-temperature drying process for retaining microbial activity and fertilizer stability.

[0083] In summary, the present application realizes the comprehensive improvement of soil fertility and structure through scientific raw material ratio and optimized preparation process, has stable fertilizer efficiency and high safety, and is suitable for large-scale production and promotion.

[0084] The above is only a preferred embodiment of the present application, and it should be noted that the above preferred embodiment should not be regarded as a limitation of the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled persons in the art, several improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A composite vermicompost organic fertilizer for improving soil fertility and structure, characterized in that, The raw material components include the following weight parts: earthworm manure 40-60 parts, rotten organic material 20-30 parts, functional microbial agent 3-5 parts, mineral additive 5-10 parts, conditioning agent 2-5 parts.

2. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 1, characterized in that, The earthworm manure is the excrement of Eisenia foetida or Allolobophora caliginosa, which is produced by taking crop stalks and livestock and poultry excrement as food, and is treated to have a water content of 20-25% and is crushed to pass through an 80-100 mesh sieve.

3. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 1, characterized in that, The rotten organic material includes garden fallen leaves, kitchen waste and edible mushroom residue, and is high-temperature aerobic rotten to have a rotten degree ≥80% and an organic matter content ≥45%.

4. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 3, characterized in that, The high-temperature temperature is 55-65℃, the rot time is 15-20 days, the oxygen amount is 0.05-0.2m 3 (m 3 h).

5. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 1, characterized in that, The functional microbial agent comprises Bacillus subtilis, phosphate-solubilizing and potassium-solubilizing bacteria, and Bacillus mucilaginosus, and the total viable bacterial count is ≥2.0×10 9 CFU / g.

6. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 1, characterized in that, The mineral additive includes zeolite powder, bentonite and dolomite powder, and has a particle size of 100-120 mesh.

7. The complex vermicompost organic fertilizer for improving soil fertility and structure according to claim 1, characterized in that, The conditioning agent includes humic acid and amino acid chelate, wherein the humic acid content is ≥60% and the total amino acid content is ≥30%.

8. A method of preparing the composite vermicompost organic fertilizer according to any one of claims 1 to 7, characterized in that, The method includes the following steps: Raw material pretreatment: the earthworm manure is dried and crushed to pass through a sieve according to requirements, the rotten organic material is crushed, the mineral additive and the conditioning agent are dried respectively, and are ready for use; Segmented mixing: the earthworm manure and the rotten organic material are first added to a mixing machine, and are stirred at room temperature until they are uniformly mixed to obtain a base mixture; Functional bacteria inoculation: the functional microbial agent is diluted and is uniformly sprayed on the base mixture while stirring; Mineral and conditioning agent addition: the mineral additive and the conditioning agent are added to the material after functional bacteria inoculation, and are stirred until they are uniformly mixed to obtain a composite material; Low-temperature drying: the composite material is placed in a low-temperature drying device for drying, and intermittent stirring is adopted during the drying process, thereby obtaining a composite earthworm manure organic fertilizer product.

9. The method of claim 8, wherein, In the raw material pretreatment, the rotten organic material is crushed to have a particle size ≤5 mm, and the mineral additive and the conditioning agent are dried to have a water content ≤10%; in the functional bacteria inoculation, the functional microbial agent is diluted 10-20 times with sterile water having a pH value of 6.5-7.5, and the water content of the base mixture is controlled to be 30-35%; in the low-temperature drying, the drying temperature is 40-45°C, and the water content is dried to be 15-20%.

10. A method of soil improvement, characterized by, The composite earthworm manure organic fertilizer according to any one of claims 1-7 is used for improving the organic matter content of soil, improving the soil aggregate structure, and enhancing the soil air permeability and water retention.

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