Method for preparing high-solubility manure based on composite earthworm compost and application thereof

Abstract

The application provides a method for preparing high-solubility manure based on composite earthworm compost and application, and the method comprises the following steps: constructing a compost site, and setting composted ridge areas in the compost site at intervals; laying a gauze in the composted ridge area to obtain a ridge compost tank; uniformly laying compost raw materials in the ridge compost tank to obtain a compost raw material layer; inoculating deep-dwelling earthworms in the soil outside the ridge compost tank; inoculating surface-dwelling earthworms on the surface of the compost raw material layer to obtain an earthworm compost; performing temperature regulation and humidity regulation on the earthworm compost, and performing composite composting on the earthworm compost through the deep-dwelling earthworms and the surface-dwelling earthworms to obtain composite earthworm compost; and collecting and post-processing the composite earthworm compost to obtain high-solubility organic carbon earthworm manure. The application introduces deep-dwelling earthworms and surface-dwelling earthworms to perform composite composting, innovatively regulates the carbon conversion path in the composting process, and greatly increases the content of soluble organic carbon in the prepared earthworm manure.

Description

Technical Field

[0001] This invention relates to the field of organic solid waste resource utilization and soil carbon pool improvement technology, specifically a method and application for preparing highly soluble manure based on compound earthworm compost. Background Technology

[0002] Vermicomposting is a common biotechnology for treating organic waste and producing organic fertilizer. Traditional methods mainly utilize ectophytic earthworms such as Eisenia fetida, which can effectively degrade organic matter and shorten the composting cycle. However, the resulting vermicompost has a significant drawback: the soluble organic carbon content is often low. This is because the carbon source of organic materials is easily over-mineralized into carbon dioxide by earthworms and their intestinal microorganisms, preventing the effective accumulation of this valuable intermediate product, soluble organic carbon, thus limiting the rapid fertilization capacity of vermicompost.

[0003] Dissolved organic carbon (DOC) is an active carbon component in fertilizers that can be rapidly utilized by soil microorganisms and easily absorbed by crops, playing a crucial role in rapidly improving soil fertility. In traditional vermicomposting, several techniques have been attempted to improve the quality of vermicompost, such as adding biochar or combining vermicomposting with a high-temperature composting stage. While these methods may improve fertilizer stability, they often further accelerate the decomposition of DOC, failing to address the core issue of its low content. Furthermore, there are reports of using two or more types of earthworms for compound composting; however, the selected earthworms are often species with similar ecological habits (e.g., all are ectophytic), resulting in overlapping functions and an inability to form effective division of labor and synergy within the compost, thus offering limited effectiveness in increasing DOC content.

[0004] Therefore, there is a need for a method to specifically increase the soluble organic carbon content in earthworm compost products. This method involves introducing pluripotent and terrestrial earthworms with complementary ecological niches for compound composting, which can efficiently produce earthworm castings with high soluble organic carbon and significantly improve the level of active carbon in the soil. Summary of the Invention

[0005] To overcome the problems existing in related technologies, the purpose of this invention is to provide a method and application for preparing highly soluble manure based on compound earthworm compost. The method can specifically increase the soluble organic carbon content in earthworm compost products. By introducing deep-dwelling and surface-dwelling earthworms with complementary ecological niches for compound composting, it is possible to efficiently produce earthworm manure with high soluble organic carbon and significantly improve the level of active carbon pool in the soil.

[0006] A method for preparing highly soluble manure based on compound vermicompost includes: Construct a composting site, wherein composting windrow areas are spaced out within the composting site; A mesh screen is laid in the composting windrow area to obtain a windrow composting trough; wherein the width of the mesh screen is greater than the width of the above-ground trough of the windrow composting trough, and the edge of the mesh screen extends to the outside of the underground trough of the windrow composting trough. The composting material is evenly spread in the windrow composting trough to obtain a composting material layer; Deep-dwelling earthworms were inoculated into the soil outside the windrow composting trough; Epiphytic earthworms are inoculated on the surface of the compost material layer to obtain an earthworm mound. Temperature and humidity are controlled in the earthworm pile, and compound earthworm compost is obtained by combining the deep-dwelling earthworms and the surface-dwelling earthworms. The compound earthworm compost was collected and post-processed to obtain highly soluble organic carbon earthworm castings.

[0007] In a preferred embodiment of the present invention, the width of the above-ground section of the windrow composting trough is 80cm, and the height of the above-ground section of the windrow composting trough is 30cm; the cross-sectional shape of the underground section of the windrow composting trough is an inverted trapezoid, and the depth of the underground section of the windrow composting trough is 10cm.

[0008] In a preferred embodiment of the present invention, the step of laying the mesh in the composting windrow area to obtain a windrow composting trough includes: A high-strength polyethylene mesh is laid at the bottom of the composting windrow area to form a mesh base layer; wherein the mesh size of the high-strength polyethylene mesh is 2mm. Rigid plastic mesh is vertically buried around the composting strip area to form an isolation barrier; wherein the underground burial depth of the rigid plastic mesh is greater than or equal to 100cm, the above-ground exposed height of the rigid plastic mesh is greater than or equal to 30cm, and the aperture of the rigid plastic mesh is 2mm.

[0009] In a preferred embodiment of the present invention, the step of uniformly spreading the composting raw materials in the windrow composting tank to obtain a composting raw material layer includes: The composting raw materials are pretreated to obtain pretreated composting raw materials; wherein, the pretreatment includes spreading out to dry and turning over; The pretreated composting material is evenly spread in the windrow composting trough and kept loose; wherein the thickness of the composting material is 40cm and the initial moisture content of the composting material is controlled at 65%-70%.

[0010] In a preferred embodiment of the present invention, the step of inoculating the surface of the compost material layer with epiphytic earthworms to obtain an earthworm mound includes: During the fermentation period of the compost material, terrestrial earthworms are evenly sown on the surface of the compost material layer; the inoculation density is 5,000-7,000 earthworms per cubic meter of total compost material volume. During the stabilization period of compost materials, the inoculation density of epiphytic earthworms is increased to 8,000-10,000 per cubic meter of total compost material volume.

[0011] In a preferred embodiment of the present invention, the step of temperature and humidity control of the earthworm pile includes: During the fermentation period of the compost raw materials, when the core temperature of the earthworm pile is greater than 35°C, the surface of the earthworm pile is slightly loosened to aid heat dissipation; the surface of the earthworm pile is irrigated and sprayed through an irrigation system and a spraying device to maintain the humidity of the earthworm pile at 60%-70%.

[0012] During the conversion period of compost raw materials, when the core temperature of the earthworm pile exceeds 35°C, black netting is used to enhance shading, while spraying and irrigation are used to cool down and regulate humidity.

[0013] In a preferred embodiment of the present invention, the collection and post-processing of the compound earthworm compost to obtain highly soluble organic carbon earthworm castings includes: By lifting the extended edge of the mesh, the entire composite earthworm compost is moved out of its original position and laid flat in a clean operating area next to it. After letting it stand for a period of time, once the earthworms have gathered inside the material, use tools to collect the earthworm castings without earthworms. The earthworm-free earthworm castings are spread out in a well-ventilated and shady place to air dry until the moisture content drops below 30%, thus obtaining dried earthworm castings. The dried earthworm castings are crushed and sieved to obtain highly soluble organic carbon earthworm castings.

[0014] In a preferred embodiment of the present invention, the construction of the composting site includes: Choose a site with good drainage, shade, or where you plan to build an orchard; Fruit tree seedlings for shading are planted on both sides of the composting windrow area, with the planting point of the fruit tree seedlings being 1-1.5 meters away from the edge of the composting windrow area.

[0015] In a preferred embodiment of the present invention, the inoculation density of the deep-dwelling earthworms is 30-40 per square meter of soil area.

[0016] The application of the highly soluble organic carbon vermicompost prepared according to the above method in improving the soluble organic carbon in soil involves applying the highly soluble organic carbon vermicompost as a base fertilizer to the soil of crops to increase the active carbon pool and improve soil structure; wherein the crops are vegetables and fruits.

[0017] The beneficial effects of this invention are as follows: The method for preparing highly soluble manure based on compound earthworm composting provided by this invention includes constructing a composting site, wherein composting windrow areas are spaced apart within the composting site; laying a mesh screen in the windrow areas to obtain a windrow-type composting trough; wherein the width of the mesh screen is greater than the width of the above-ground trough of the windrow-type composting trough, and the edge of the mesh screen extends to the outside of the underground trough of the windrow-type composting trough; evenly spreading composting materials in the windrow-type composting trough to obtain a composting material layer; inoculating deep-dwelling earthworms into the soil outside the windrow-type composting trough; inoculating surface-dwelling earthworms on the surface of the composting material layer to obtain an earthworm pile; controlling the temperature and humidity of the earthworm pile; performing compound composting using the deep-dwelling earthworms and the surface-dwelling earthworms to obtain compound earthworm compost; collecting and post-processing the compound earthworm compost to obtain highly soluble organic carbon earthworm manure. This invention innovatively regulates the carbon conversion pathway during composting by introducing a complementary combination of deep-dwelling and surface-dwelling earthworms, significantly increasing the soluble organic carbon content in the resulting vermicompost. Experiments have shown that the soluble organic carbon content is more than 50% higher than that of traditional single-type surface-dwelling earthworm compost. The preparation method of this invention has clear procedures and specific parameters. Through no-turning management and a bottom mesh design, it ensures the synergistic effect of the composite earthworm system and facilitates the harvesting of vermicompost, making it suitable for large-scale production. This product is rich in soluble organic carbon, which, upon application to the soil, rapidly replenishes the soil's active carbon pool, enhances soil fertility and biological activity, and provides a more efficient carbon source for crop growth. Attached Figure Description

[0018] Figure 1 This is a flowchart of the method for preparing highly soluble manure based on compound earthworm compost of the present invention; Figure 2 This is a schematic diagram of the composite earthworm composting of surface-dwelling and deep-dwelling types according to the present invention; Figure 3 This is a graph showing the soluble organic carbon content of the high soluble organic carbon earthworm castings fertilizer of the present invention. Figure 4 This is a graph showing the organic carbon content of the high-soluble organic carbon earthworm castings fertilizer of the present invention; Figure 5 This is a diagram showing the proportion of soluble organic carbon to organic carbon in the high soluble organic carbon earthworm castings fertilizer of this invention. Figure 6This is a regression analysis graph showing the soluble organic carbon content of soil and earthworm castings with high soluble organic carbon according to the present invention. Detailed Implementation

[0019] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0020] Example 1 like Figures 1 to 6 As shown, this embodiment provides a method for preparing highly soluble manure based on compound earthworm compost, including: S1: Construct a composting site, wherein composting windrow areas are spaced out within the composting site; S2: Lay the mesh in the composting windrow area to obtain a windrow composting trough; wherein the width of the mesh is greater than the width of the above-ground trough of the windrow composting trough, and the edge of the mesh extends to the outside of the underground trough of the windrow composting trough. S3: Spread the composting raw materials evenly in the windrow composting trough to obtain a composting raw material layer; S4: Inoculate the soil outside the windrow composting trough with deep-rooted earthworms; S5: Inoculate the surface of the compost material layer with epiphytic earthworms to obtain an earthworm mound; S6: Temperature and humidity are controlled in the earthworm pile, and compound earthworm compost is obtained by combining the deep-dwelling earthworms and the surface-dwelling earthworms. S7: Collect and post-process the compound earthworm compost to obtain highly soluble organic carbon earthworm castings.

[0021] Dissolved organic carbon (DOC) refers to a mixture of different organic carbon molecules that are soluble in water and can pass through a 0.45 μm filter membrane under specific spatial and temporal conditions. It is a highly active component of soil organic carbon or total organic carbon in water bodies, characterized by high mobility, rapid turnover, and high biological activity, enabling it to be quickly utilized by microorganisms. High soluble organic carbon generally refers to a state where the content of soluble organic carbon (DOC) in the environment is at a high level.

[0022] When preparing highly soluble organic carbon vermicompost fertilizer, it is first necessary to construct a composting site and ecological facilities.

[0023] The construction of the composting site includes: S11: Select a site that is well-drained, shady, or where an orchard is planned to be built; S12: Plant fruit tree seedlings for shading on both sides of the composting windrow area, with the planting point of the fruit tree seedlings being 1-1.5 meters away from the edge of the composting windrow area.

[0024] In well-drained soils, oxygen is abundant, and microorganisms primarily engage in aerobic decomposition. This decomposition method tends to convert organic matter into DOC, which has a relatively simple structure but is rich in active functional groups such as carboxyl and hydroxyl groups. This type of DOC has a stronger complexing ability and can effectively chelate metal ions such as calcium, magnesium, iron, and aluminum to form stable organic-inorganic complexes, which helps in the formation of soil aggregates and improves soil structure. Good drainage not only ensures soil aeration but also prevents DOC from producing harmful substances or greenhouse gases (CH4) under anaerobic conditions. Shady areas have lower soil temperatures, slowing down the decomposition of organic matter and promoting DOC accumulation. Planting deciduous fruit tree seedlings (such as lemon and osmanthus) on both sides of the composting windrow area provides variable shade through their canopies. This variable shade can provide shade during critical periods (such as high temperatures in summer and drought), preventing DOC from being rapidly depleted due to excessive mineralization. The planting point of fruit tree seedlings should be 1-1.5 meters away from the edge of the composting windrow area to prevent high concentrations of DOC from "burning" and "poisoning" the roots of the fruit tree seedlings.

[0025] Subsequently, a mesh base layer is laid in the planned composting windrow area, and side slopes are constructed above the mesh to form the windrow composting trough.

[0026] The width of the above-ground section of the windrow composting trough is 80cm, and the height of the above-ground section of the windrow composting trough is 30cm; the cross-sectional shape of the underground section of the windrow composting trough is an inverted trapezoid, and the depth of the underground section of the windrow composting trough is 10cm.

[0027] The process of laying the mesh in the composting windrow area to obtain a windrow composting trough includes: S21: A high-strength polyethylene mesh is laid at the bottom of the composting windrow area to form a mesh base layer; wherein the mesh size of the high-strength polyethylene mesh is 2mm; S22: A rigid plastic mesh is vertically buried around the composting strip area to form an isolation enclosure; wherein the underground burial depth of the rigid plastic mesh is greater than or equal to 100cm, the above-ground exposed height of the rigid plastic mesh is greater than or equal to 30cm, and the aperture of the rigid plastic mesh is 2mm.

[0028] The composting site is divided into 80cm wide windrow areas. A high-strength polyethylene mesh with a 2mm mesh opening is laid at the bottom of each windrow area to form the base layer. The width of the polyethylene mesh must be greater than the width of the windrow itself, extending beyond the underground section of the windrow for easy operation. Rigid plastic mesh with a 2mm mesh opening is vertically buried around the windrow areas to form an enclosure. The buried depth of the rigid plastic mesh is at least 100cm, and the exposed height above ground is at least 30cm to effectively prevent earthworms from escaping. The mesh base layer and the isolation fencing together form a windrow composting trough. The windrow composting trough includes an above-ground trough and an underground trough. The above-ground trough has a rectangular cross-section; the length (width) of the rectangle is 80cm, and the height (height) is 30cm. The area of ​​the rectangle is 2400cm². 2 The cross-sectional shape of the underground trench is an inverted trapezoid. The top side of the inverted trapezoid, which is also the width of the top side of the trench, is 80cm. The bottom side of the inverted trapezoid, which is also the width of the bottom side of the trench, is 60cm. The height of the inverted trapezoid, which is also the depth of the trench, is 10cm. The area of ​​the inverted trapezoid is 700cm². 2 .

[0029] The process of evenly spreading composting materials in the windrow composting tank to obtain a composting material layer includes: S31: Pre-treat the composting raw materials to obtain pre-treated composting raw materials; wherein, the pre-treatment includes spreading out to dry and turning over; S32: The pretreated composting material is evenly spread in the windrow composting trough and kept loose; wherein the thickness of the composting material is 40cm and the initial moisture content of the composting material is controlled at 65%-70%.

[0030] The process of inoculating the surface of the compost material layer with epiphytic earthworms to obtain an earthworm mound includes: S51: During the fermentation period of the compost material, terrestrial earthworms are evenly sown on the surface of the compost material layer; wherein, the inoculation density is 5000-7000 earthworms per cubic meter of total compost material volume. S52: During the stabilization period of compost materials, increase the inoculation density of epiphytic earthworms to 8,000-10,000 per cubic meter of total compost material volume.

[0031] The inoculation density of the deep-dwelling earthworms is 30-40 per square meter of soil area.

[0032] This embodiment uses uncomposted fresh cow manure as the composting material. Before use, the uncomposted fresh cow manure can undergo simple pretreatment, such as spreading it out to dry to adjust the initial moisture content to 65%-70%, and turning it appropriately to release some free ammonia, making it more suitable for direct earthworm treatment. After the mesh is laid, the pretreated uncomposted fresh cow manure is evenly spread in the windrow composting trough, kept loose, with a final thickness of 40cm and an initial moisture content controlled at 65%-70%, thus obtaining the composting material layer.

[0033] This embodiment uses *Amynthas aspergillum*, a deep-dwelling earthworm, and *Eisenia fetida* or *Eisenia eugeniae*, a surface-dwelling earthworm, as examples. *Amynthas aspergillum* is a typical deep-soil-dwelling species, inhabiting the soil in this embodiment. It ascends to the surface compost layer at night or when environmental conditions are suitable to feed, and its activity introduces soil microorganisms and promotes the decomposition and transformation of deep-layer materials. Both *Eisenia fetida* and *Eisenia eugeniae* prefer to live on the surface and inside of organic materials, responsible for directly feeding on, breaking down, and initially transforming fresh materials.

[0034] After the composting materials are laid out, inoculate the soil outside the windrow composting trough with 30-40 burrowing earthworms (Eisenia fetidae) at a density of 30-40 earthworms per square meter of soil. 24-48 hours after inoculation, evenly scatter surface earthworms (Eisenia fetidae or Eugenius verrucae) on the surface of the cow manure compost layer. The burrowing and surface earthworms are introduced alternately. Surface earthworms live in and feed on organic matter like cow manure, so they are placed directly on the surface of the compost layer. Burrowing earthworms live in the soil and emerge to feed on organic matter, so they are placed directly on the soil surface outside the windrow composting trough. Since the raw material is fresh cow manure, the initial fermentation period (days 1-7) may generate some heat and ammonia. Therefore, the initial inoculation density can be slightly lower, approximately 5000-7000 earthworms per cubic meter of compost material. Once the compost pile stabilizes (approximately 7-10 days later), the density can be increased to 8000-10000 earthworms as needed. This ensures that surface-dwelling earthworms can safely colonize within the 30-40cm thick material layer, while also having sufficient space to survive and move around to complete the decomposition process.

[0035] The temperature and humidity control of the earthworm pile includes: S61: During the fermentation period of the compost raw materials, when the core temperature of the earthworm pile is greater than 35°C, the surface of the earthworm pile is slightly loosened to assist in heat dissipation; the surface of the earthworm pile is irrigated and sprayed through an irrigation system and a spraying device to maintain the humidity of the earthworm pile at 60%-70%.

[0036] S62: During the conversion period of compost raw materials, when the core temperature of the earthworm pile is greater than 35°C, a black net is erected to enhance shading, while spraying and irrigation are used to cool down and regulate humidity.

[0037] During the fermentation period of the compost material (days 1-7), the fresh cow manure may undergo aerobic fermentation, leading to excessively high temperatures in the earthworm pile. Temperature control is necessary. This can be achieved by utilizing the canopies of fruit trees along the sides of the composting windrows to provide ecological shade and by using the windrow structure itself to dissipate heat. Additionally, close monitoring of the core temperature is crucial. If the core temperature consistently exceeds 35°C, slight loosening of the surface layer can aid in heat dissipation, but deep turning should be avoided to prevent disrupting the earthworms' habitat. Simultaneously, humidity control is also essential. Using a surface irrigation system combined with a spray system, targeted and quantitative watering can be applied directly to the surface of the compost material layer, precisely maintaining the humidity of the earthworm pile within a suitable range of 60%-70%.

[0038] During the conversion period of compost materials (days 8-28), after the temperature of the earthworm pile stabilizes at 20-30℃, it enters the earthworm-dominated conversion stage. During this stage, the canopy of the fruit tree seedlings still needs to provide ecological shading to maintain a suitable environment. When the temperature of the earthworm pile becomes too high, i.e., the core temperature exceeds 35℃, further shading can be achieved by erecting black netting. Double shading effectively blocks direct sunlight and lowers the ambient temperature of the earthworm pile. Simultaneously, spraying and irrigation are used to cool the earthworm pile and regulate humidity. The humidity of the earthworm pile should be checked and adjusted every 3-5 days to maintain it at 60%-70%. No turning of the earthworm pile is required throughout the process; aeration and material mixing are achieved through the vertical movement of both types of earthworms. The total composting cycle is 29-35 days, ensuring that fresh cow manure is fully decomposed into stable vermicompost fertilizer.

[0039] The method for preparing highly soluble manure based on compound earthworm composting provided in this embodiment includes constructing a composting site, wherein composting windrow areas are spaced apart within the composting site; laying a mesh screen in the composting windrow areas to obtain a windrow-type composting trough; wherein the width of the mesh screen is greater than the width of the above-ground trough of the windrow-type composting trough, and the edge of the mesh screen extends to the outside of the underground trough of the windrow-type composting trough; evenly spreading composting materials in the windrow-type composting trough to obtain a composting material layer; inoculating deep-dwelling earthworms into the soil outside the windrow-type composting trough; inoculating surface-dwelling earthworms on the surface of the composting material layer to obtain an earthworm pile; controlling the temperature and humidity of the earthworm pile; performing compound composting using the deep-dwelling earthworms and the surface-dwelling earthworms to obtain compound earthworm compost; collecting and post-processing the compound earthworm compost to obtain highly soluble organic carbon earthworm manure. First, select a well-drained, shady site, or a site where an orchard is planned. Within this site, designate composting windrow areas, spaced out. Plant fruit tree seedlings for shading along both sides of the windrow areas, utilizing their canopies to provide ecological shade. Next, lay a layer of mesh fabric as a base layer in the windrow areas. Construct side slopes above the mesh to form windrow-style composting troughs. After the mesh is laid, evenly spread the compost material within the windrow-style composting troughs, keeping it loose, to a thickness of 40cm, forming a layer of compost material. The next step is to inoculate basal earthworms into the soil on the outside, sides, and bottom of the windrow composting trough at a density of 30-40 earthworms per square meter of soil. 24-48 hours after inoculation, terrestrial earthworms are evenly scattered onto the surface of the compost material layer, forming an earthworm mound. During the initial fermentation of the compost material, the inoculation density can be slightly lower, approximately 5000-7000 earthworms per cubic meter of total compost volume. Once the earthworm mound has stabilized, the inoculation density can be increased to 8000-10000 earthworms per cubic meter of total compost volume, depending on the situation. This ensures that the terrestrial earthworms can safely colonize within the 30-40cm thick compost material layer, while also having sufficient space to survive and move around to complete the decomposition process. Then, temperature and humidity are controlled within the earthworm piles during the composting process. Temperature control relies on the ecological shading provided by deciduous fruit trees planted on both sides of the composting windrows. Additional black netting is erected during composting to enhance the shading and cooling effect. This double shading effectively blocks direct sunlight and lowers the ambient temperature of the earthworm piles. If the core temperature of the earthworm pile exceeds 35℃, only the surface layer is slightly loosened to aid heat dissipation. The earthworm piles are not disturbed throughout the process to avoid disrupting the earthworm habitat and community synergy. Humidity control is achieved through a surface irrigation system combined with a spray system within the composting windrows, providing targeted and quantitative watering. Spraying or irrigating the surface of the earthworm piles precisely maintains the humidity within a suitable range of 60%-70%, achieving uniform humidity control without disturbing the earthworm piles.After the composting cycle is completed, compound vermicompost is obtained. The entire compound vermicompost is harvested as a whole by lifting the edge of the mesh screen. Finally, the harvested compound vermicompost is separated from the vermicompost, air-dried, and sieved to obtain the final product: high-soluble organic carbon vermicompost. This invention innovatively regulates the carbon conversion pathway in the composting process by introducing ecologically complementary deep-dwelling and surface-dwelling earthworms for compound composting, significantly increasing the soluble organic carbon content in the resulting vermicompost. The preparation method of this invention has clear procedures and specific parameters. Through no-turning management and bottom mesh screen design, it ensures the synergistic effect of the compound earthworm system and facilitates the subsequent harvesting of vermicompost, making it suitable for large-scale production applications.

[0040] Example 2 like Figures 1 to 6 As shown, this embodiment provides a method for preparing highly soluble manure based on compound earthworm compost. This embodiment describes the differences between it and Example 1. The method includes: S1: Construct a composting site, wherein composting windrow areas are spaced out within the composting site; S2: Lay the mesh in the composting windrow area to obtain a windrow composting trough; wherein the width of the mesh is greater than the width of the above-ground trough of the windrow composting trough, and the edge of the mesh extends to the outside of the underground trough of the windrow composting trough. S3: Spread the composting raw materials evenly in the windrow composting trough to obtain a composting raw material layer; S4: Inoculate the soil outside the windrow composting trough with deep-rooted earthworms; S5: Inoculate the surface of the compost material layer with epiphytic earthworms to obtain an earthworm mound; S6: Temperature and humidity are controlled in the earthworm pile, and compound earthworm compost is obtained by combining the deep-dwelling earthworms and the surface-dwelling earthworms. S7: Collect and post-process the compound earthworm compost to obtain highly soluble organic carbon earthworm castings.

[0041] The process of collecting and post-processing the compound vermicompost yields highly soluble organic carbon vermicompost, comprising: S71: By lifting the extended edge of the mesh, the entire composite earthworm compost is moved out of its original position and laid flat in a clean operating area next to it; S72: After standing for a period of time, once the earthworms have gathered inside the material, use tools to collect the earthworm castings without earthworms. S73: Spread the earthworm-free earthworm castings in a well-ventilated and shady place to air dry until the moisture content drops below 30% to obtain dried earthworm castings. S74: The dried vermicompost is crushed and sieved to obtain highly soluble organic carbon vermicompost.

[0042] After the composting cycle is complete, the resulting vermicompost should be loose, dark brown, and odorless, indicating proper decomposition. Harvesting can then begin. Two people working together will lift the extended edge of the mesh laid at the bottom of the stack, removing the entire decomposed vermicompost (including the converted vermicompost, surface-dwelling earthworms, and deep-dwelling earthworms that have ascended to feed in the compost layer) from its original location and spreading it evenly in a clean working area. Next, after a period of settling, to avoid light, the earthworms will gather in the interior of the material. Use tools to collect most of the vermicompost, which is now mostly devoid of earthworms. The remaining core material, rich in earthworms, can be used as "seed" for inoculating the next batch of compost. Then, the vermicompost undergoes post-processing. The collected, earthworm-free vermicompost is spread out in a cool, well-ventilated place to air-dry, turning it occasionally, until the moisture content drops below 30%, resulting in dried vermicompost. Finally, the dried earthworm castings are crushed and passed through a 20-mesh sieve to obtain the high-quality, highly soluble organic carbon earthworm castings product described in this invention.

[0043] like Figures 2 to 4 As shown, compared to conventional compost, by adding a deep-dwelling earthworm (Eupolyphaga sinensis), compound earthworm compost increased the soluble organic carbon content by 22.12% and 55.29%, organic carbon by 0.59% and 2.65%, and the soluble organic carbon percentage by 21.76% and 51.00%, respectively. Single earthworm compost reduced the soluble organic carbon content by 8.26%, organic carbon by 2.54%, and the soluble organic carbon percentage by 5.84%. Overall, compound earthworm compost showed the most significant increase in soluble organic carbon content. This invention, by introducing ecologically complementary deep-dwelling and surface-dwelling earthworms for compound composting, innovatively regulates the carbon conversion pathway in the composting process, resulting in a significant increase in the soluble organic carbon content of the produced earthworm castings. Experiments have confirmed that its soluble organic carbon content can be increased by more than 50% compared to traditional single-surface-dwelling earthworm compost products.

[0044] The application of the highly soluble organic carbon vermicompost fertilizer prepared by the above method in improving the soluble organic carbon in soil involves applying the highly soluble organic carbon vermicompost fertilizer as a base fertilizer to the soil of crops to increase the active carbon pool of the soil and improve soil structure; wherein the crops are vegetables and fruits.

[0045] The prepared highly soluble organic carbon earthworm castings fertilizer is applied as a base fertilizer to fields of cash crops such as vegetables and fruits. It is evenly spread at a rate of 1000 kg / mu 7-10 days before sowing or transplanting, and mixed into the topsoil by rotary tillage, etc., to enhance the active carbon pool of the soil, improve the soil structure, and provide carbon source and nutrients for the early growth of crops.

[0046] like Figure 5 As shown, when high-soluble organic carbon vermicelli manure is applied to the soil, the soluble organic carbon content of the soil increases with the increase of the soluble organic carbon content of the vermicelli manure. This indicates that high-soluble organic carbon vermicelli manure produced by compound vermicelli compost can significantly increase the soluble organic carbon content of the soil, thereby improving soil biological activity and soil ecology. The high-soluble organic carbon vermicelli manure prepared by the method of this invention is rich in soluble organic carbon. After being applied to the soil, it can quickly replenish the active carbon pool of the soil, improve soil fertility and biological activity, and provide a more efficient carbon source for crop growth.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0048] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for preparing highly soluble manure based on compound earthworm compost, characterized in that, include: Construct a composting site, wherein composting windrow areas are spaced out within the composting site; A mesh screen is laid in the composting windrow area to obtain a windrow composting trough; wherein the width of the mesh screen is greater than the width of the above-ground trough of the windrow composting trough, and the edge of the mesh screen extends to the outside of the underground trough of the windrow composting trough. The composting material is evenly spread in the windrow composting trough to obtain a composting material layer; Deep-dwelling earthworms were inoculated into the soil outside the windrow composting trough; Epiphytic earthworms are inoculated on the surface of the compost material layer to obtain an earthworm mound. Temperature and humidity are controlled in the earthworm pile, and compound earthworm compost is obtained by combining the deep-dwelling earthworms and the surface-dwelling earthworms. The compound earthworm compost was collected and post-processed to obtain highly soluble organic carbon earthworm castings.

2. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The width of the above-ground section of the windrow composting trough is 80cm, and the height of the above-ground section of the windrow composting trough is 30cm; the cross-sectional shape of the underground section of the windrow composting trough is an inverted trapezoid, and the depth of the underground section of the windrow composting trough is 10cm.

3. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The process of laying the mesh in the composting windrow area to obtain a windrow composting trough includes: A high-strength polyethylene mesh is laid at the bottom of the composting windrow area to form a mesh base layer; wherein the mesh size of the high-strength polyethylene mesh is 2mm. Rigid plastic mesh is vertically buried around the composting strip area to form an isolation barrier; wherein the underground burial depth of the rigid plastic mesh is greater than or equal to 100cm, the above-ground exposed height of the rigid plastic mesh is greater than or equal to 30cm, and the aperture of the rigid plastic mesh is 2mm.

4. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The process of evenly spreading composting materials in the windrow composting tank to obtain a composting material layer includes: The composting raw materials are pretreated to obtain pretreated composting raw materials; wherein, the pretreatment includes spreading out to dry and turning over; The pretreated composting material is evenly spread in the windrow composting trough and kept loose; wherein the thickness of the composting material is 40cm and the initial moisture content of the composting material is controlled at 65%-70%.

5. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The process of inoculating the surface of the compost material layer with epiphytic earthworms to obtain an earthworm mound includes: During the fermentation period of the compost material, terrestrial earthworms are evenly sown on the surface of the compost material layer; the inoculation density is 5,000-7,000 earthworms per cubic meter of total compost material volume. During the stabilization period of compost materials, the inoculation density of epiphytic earthworms is increased to 8,000-10,000 per cubic meter of total compost material volume.

6. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The temperature and humidity control of the earthworm pile includes: During the fermentation period of the compost raw materials, when the core temperature of the earthworm pile exceeds 35°C, the surface layer of the earthworm pile is slightly loosened to aid heat dissipation; the surface layer of the earthworm pile is irrigated and sprayed using an irrigation system and a spraying device to maintain the humidity of the earthworm pile at 60%-70%. During the conversion period of compost raw materials, when the core temperature of the earthworm pile exceeds 35°C, black netting is used to enhance shading, while spraying and irrigation are used to cool down and regulate humidity.

7. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The process of collecting and post-processing the compound vermicompost yields highly soluble organic carbon vermicompost, comprising: By lifting the extended edge of the mesh, the entire composite earthworm compost is moved out of its original position and laid flat in a clean operating area next to it. After letting it stand for a period of time, once the earthworms have gathered inside the material, use tools to collect the earthworm castings without earthworms. The earthworm-free earthworm castings are spread out in a well-ventilated and shady place to air dry until the moisture content drops below 30%, thus obtaining dried earthworm castings. The dried earthworm castings are crushed and sieved to obtain highly soluble organic carbon earthworm castings.

8. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The construction of the composting site includes: Choose a site with good drainage, shade, or where you plan to build an orchard; Fruit tree seedlings for shading are planted on both sides of the composting windrow area, with the planting point of the fruit tree seedlings being 1-1.5 meters away from the edge of the composting windrow area.

9. The method for preparing highly soluble manure based on compound earthworm compost according to claim 1, characterized in that, The inoculation density of the deep-dwelling earthworms is 30-40 per square meter of soil area.

10. The application of the highly soluble organic carbon vermicompost fertilizer prepared according to any one of claims 1-9 in improving soil soluble organic carbon, characterized in that, The highly soluble organic carbon vermicompost is applied as a base fertilizer to the soil of crops to increase the active carbon pool and improve soil structure; wherein the crops are vegetables and fruits.

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