Slow release fertilizer prepared by recycling waste fallen leaves

Abstract

The invention relates to the technical field of nursery stock planting, and particularly discloses a slow release fertilizer prepared by recycling waste fallen leaves. The slow-release fertilizer is composed of a slow-release shell layer and a core material according to a weight ratio of (1500-3000): 1, wherein the slow-release shell layer comprises the following raw materials: fallen leaf carrier powder, honey, traditional Chinese medicine residues and a microbial agent, and the core material is a composite growth promoting agent; the slow-release fertilizer is prepared by the following steps: firstly sterilizing and crushing fallen leaves, premixing fallen leaf carrier powder with traditional Chinese medicine residues, then uniformly spraying a microbial agent, adding honey, uniformly mixing to obtain mold pressing powder, performing step-by-step mold pressing on the mold pressing powder to obtain hollow spheres, and coating a composite growth promoting agent. The slow-release fertilizer efficiently repairs the injured root system of the transplanted tree, and the root system quickly recovers and absorbs nutrient substances in the slow-release fertilizer; the slow-release fertilizer is degraded into loose porous particles, so that heavy metal cations in soil can be absorbed, the soil structure is improved, and the porosity and the air permeability of the soil are improved; the industry blank that the slow-release fertilizer cannot be directly applied to the root system of the transplanted tree is filled.

Description

Technical Field

[0001] The present application relates to the technical field of seedling planting, and more specifically, to a slow-release fertilizer made by recycling discarded fallen leaves. Background Art

[0002] Cities need to transplant a large number of trees every year to ensure the city's green area. After the trees are transplanted, the root system is damaged to varying degrees, and it is difficult for the root system to absorb the water and nutrients needed by the trees. Therefore, after the trees are transplanted, the nutrients are generally injected into the trunks and compound fertilizers are sprayed around the soil regularly to provide nutrients. However, methods such as nutrient solution injection still require holes to be opened in the trunks, which causes certain damage to the trees and affects the survival rate of transplanted trees. Spraying compound fertilizers around the soil can easily lead to soil compaction and salinization, affecting soil health.

[0003] Based on this situation, the present application has developed a new type of slow-release fertilizer, which can be directly used in the foundation pit of newly transplanted trees to regulate the soil and promote root growth. Summary of the invention

[0004] In order to fill the industry gap that newly transplanted trees cannot be directly applied with slow-release fertilizers in foundation pits, the present application provides a slow-release fertilizer made by recycling waste fallen leaves, which is made from waste materials such as fallen leaves.

[0005] The present application provides a slow-release fertilizer made by recycling discarded fallen leaves, which adopts the following technical solution:

[0006] A slow-release fertilizer made by recycling discarded fallen leaves, comprising a slow-release shell layer and a core material in a weight ratio of (1500-3000):1;

[0007] The sustained-release shell layer comprises the following raw materials in parts by weight: 100 parts of leaf carrier powder, 220-300 parts of honey, 20-30 parts of Chinese medicine residues and 1-10 parts of microbial agents, and the core material is a composite growth promoter;

[0008] The leaf litter carrier powder is obtained by washing, disinfecting and crushing the leaf litter, and has a particle size of 100 to 1000 μm;

[0009] The slow-release fertilizer is prepared according to the following steps: premixing leaf carrier powder and Chinese medicine residue, spraying microbial agents uniformly on the premixed powder, adding honey and mixing, and obtaining a compression molded powder after uniform mixing;

[0010] The compression molded powder is pressed into a semi-hollow sphere, a solid composite growth promoter is added into the semi-hollow sphere, and finally the compression molded powder is used for sealing the mold to obtain a slow-release fertilizer with a core-shell structure.

[0011] By adopting the above technical solution, discarded fallen leaves are collected for disinfection and treatment, which reduces the bacteria and pathogens carried on the surface of the fallen leaves and avoids adverse effects on the injured roots of trees; at the same time, the discarded fallen leaves can skip the fermentation process and be directly recycled; the fallen leaf carrier powder is affected by microorganisms in the soil in the early stage of release and degrades to provide the nutrients required for tree growth; in the later stage of release, the slow-release fertilizer shell gradually degrades and the composite growth promoter is released, which promotes the root growth of transplanted trees at a moderate content;

[0012] Traditional Chinese medicine residue contains a large amount of active antibacterial ingredients, which can not only assist microbial agents in playing an excellent antibacterial role, but also help repair the injured tree roots; Traditional Chinese medicine residue can also be used as a biological matrix, which can be degraded by microbial agents, providing the nutrients needed for microbial reproduction and the nutrients needed to be absorbed by transplanted trees;

[0013] Honey is rich in sugars, proteins and trace elements, and can be regarded as an adhesive, which allows the leaf carrier powder and the Chinese medicine residue to be bonded together. At the same time, the high-concentration sugar solution of honey produces a high osmotic pressure, which plays a role in water isolation to a certain extent. In the early stage of tree transplanting, rooting water is needed, and it is not easy for water to enter the slow-release fertilizer through capillary action and dissolve the compound growth promoter, thus overcoming the problem of root burning caused by traditional fertilizers during tree transplanting.

[0014] The microbial agents selected were Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinus. Bacillus can survive in a honey solution with a high sugar concentration due to the presence of its tolerant spores, and gradually regain its vitality and metabolize and reproduce as the sugar in the honey is consumed. The metabolites of the microorganisms promote the recovery of the root system of the transplanted trees, play a role in nitrogen fixation and decomposition of soil phosphorus and potassium, and provide the nutrients required for the root growth of the transplanted trees. It can also use biological competition to regulate the bacterial flora around the soil and promote the proliferation of beneficial bacteria in the soil.

[0015] The compound growth promoter contains the above-mentioned solid substances such as indoleacetic acid, fulvic acid, naphthylacetic acid, urea, potassium dihydrogen phosphate, etc. The addition amount of the compound growth promoter is relatively low, which can not only ensure that the microbial agent is not easy to contact with the compound growth promoter and cause inactivation; but also promote the division and rapid growth of tree root cells, accelerate tree metabolism, and improve the tree's resistance to stress; at the same time, it can also directly supplement the nitrogen, phosphorus, potassium and other nutrients required by the plant root system, and improve the later growth of transplanted trees;

[0016] Through the combined action of the above-mentioned substances, slow-release fertilizers can effectively repair the injured roots of transplanted trees. The tree roots can recover quickly and absorb the nutrients in the slow-release fertilizers. The slow-release fertilizers are degraded, and the fallen leaf carrier powders and Chinese medicine residues are loose and porous, which can absorb heavy metal cations in the soil, improve soil structure, and increase soil porosity and air permeability. This fills the industry gap that slow-release fertilizers cannot be directly applied to the roots of transplanted trees.

[0017] Preferably, the particle size of the fallen leaf carrier powder is 200 to 500 μm.

[0018] By adopting the above technical solution, the particle size of the leaf carrier powder is controlled within a moderate range. When the particle size of the leaf carrier powder is too large, loose pores are likely to appear during the compression molding process, causing water to enter the slow-release shell along the capillaries, dissolving the composite growth promoter in the initial application of the slow-release fertilizer, and increasing the possibility of root burn in transplanted trees. When the particle size of the leaf carrier powder is too small, the slow-release fertilizer degrades too quickly, which may easily lead to the dissolution of the composite growth promoter before the root system is fully repaired, which has a negative impact on the root repair growth.

[0019] Preferably, the Chinese medicine residue is mixed with astragalus, codonopsis and licorice residues in a weight ratio of (1-2):(1-2):(2-6).

[0020] Preferably, the water content of the traditional Chinese medicine residue is controlled at 20-40%.

[0021] By adopting the above technical solution, the active antibacterial components in the residues of Astragalus and Codonopsis are high, while the sugar content in the residues of Licorice is high. The water content of the residues is controlled, so that the microbial agent can proliferate in a suitable environment, reducing the impact of honey on the activity of the microbial agent. The microbial agent continues to grow during the degradation of the slow-release fertilizer, and the active antibacterial components are released along with the metabolites, which continuously repair the roots of the transplanted trees.

[0022] Preferably, the Baume degree of the honey is 39 to 41 degrees.

[0023] Preferably, the honey has a Baume degree of 40 degrees.

[0024] By adopting the above technical solution, the higher the Baume degree of honey, the lower the water content in honey, and the higher the content of nutrients such as sugars and proteins in honey; the increased viscosity of honey helps to act as an adhesive to bond and shape matrix such as fallen leaf carrier powder and Chinese medicine residue. However, when the Baume degree of honey is too high, the high osmotic pressure of honey affects the proliferation of microorganisms, thereby prolonging the degradation time of the slow-release shell layer and affecting the root recovery of transplanted trees.

[0025] Preferably, the microbial agent is a mixture of Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinus according to an effective live bacterial count ratio of (1-2):(0.5-1):(1-2).

[0026] By adopting the above technical scheme, Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinous have a synergistic effect in improving the nutrient absorption of injured roots. The principle is as follows: Brevibacillus laterosporus and Bacillus gelatinous can produce a variety of antibacterial substances, showing broad-spectrum antibacterial activity, inhibiting the growth of plant pathogens, thereby promoting the healing of root wounds of newly transplanted trees and reducing the possibility of plant pathogens invading the root system; Bacillus megaterium and Bacillus gelatinous produce a large amount of plant endogenous enzymes during metabolism, which can significantly improve the root absorption rate of nutrients such as nitrogen, phosphorus and potassium, and promote root development and growth. Bacillus megaterium and Bacillus laterosporus can enhance the soil buffering capacity, retain water and moisture, and enhance the tree's ability to resist drought, cold and waterlogging.

[0027] Preferably, the composite growth promoter is composed of indoleacetic acid, fulvic acid, naphthylacetic acid, urea and potassium dihydrogen phosphate in a weight ratio of (1-2):(5-10):(2-4):(100-200):(50-100).

[0028] By adopting the above technical scheme, indoleacetic acid, fulvic acid and naphthylacetic acid, as exogenous growth hormones, help promote the root growth of transplanted trees in the later stage, while urea and potassium dihydrogen phosphate provide the nitrogen, phosphorus, potassium and other nutrients necessary for transplanted trees in the later stage, ensuring the good growth trend of transplanted trees in the later stage.

[0029] Preferably, the weight ratio of the fallen leaf carrier powder, honey, traditional Chinese medicine residue and microbial agent is 100:250:25:5.

[0030] Preferably, the sustained-release shell layer and the core material are made in a weight ratio of 2000:1.

[0031] By adopting the above technical scheme, the weight ratio of the slow-release shell and the core material of the slow-release fertilizer is adjusted, and the growth status of the trees in the early and late stages of transplantation is taken into consideration, ensuring that the wounds of the transplanted trees are fully healed in the early stage and that they fully absorb nutrients in the later stage. The transplanted trees have a good growth trend during the degradation period of the slow-release fertilizer.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. This application recycles waste materials such as fallen leaves and Chinese medicine residues. After the fallen leaves are disinfected, they are crushed into small-particle carrier powders, which can serve as carriers of microbial agents and save degradation time. Under the action of microbial agents, they are slowly degraded to provide the nutrients needed by trees.

[0034] 2. The present application adopts a core-shell structure, and the slow-release shell layer uses high-Baume honey as an adhesive to give fallen leaves and Chinese medicine residues the ability to form. At the same time, due to the high sugar content and high osmotic pressure of high-Baume honey, it plays a certain water-isolating role. In the case of large amounts of water, water is not easily dissolved through capillary action, reducing the possibility of burning the roots of trees. The slow-release fertilizer can directly contact the roots of transplanted trees, filling the technical gap in the industry.

[0035] 3. In this application, Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinosa are selected as components of the microbial agent. Bacillus has tolerant spores and can survive in honey solutions with high sugar concentrations. As the sugar in the honey is consumed, it gradually recovers its vitality and metabolizes and reproduces. The metabolites promote root recovery in the initial stage.

[0036] 4. In this application, a variety of exogenous auxins are selected and compounded with inorganic fertilizers to ensure the root growth and nutrient absorption of transplanted trees in the later stage, so that the transplanted trees have a good growth trend during the degradation period of slow-release fertilizer. DETAILED DESCRIPTION

[0037] Unless otherwise specified, the sources of raw materials in this application are as follows:

[0038] Fallen leaves: fallen leaves on urban roads;

[0039] Honey: Type is natural mature honey;

[0040] The drug residues of Codonopsis pilosula, Astragalus membranaceus and Licorice root were all collected from the pharmacy;

[0041] The strains used in this application are from the following sources and are cultivated by ourselves:

[0042] Bacillus laterosporus: Bacillus laterosporus, NBF-129;

[0043] Bacillus megaterium de Bary, ACCC10011;

[0044] Jelly-like Bacillus: Bacilus mucilaginosus Krasilnikov, ACCC10007.

[0045] Example

[0046] Example 1

[0047] A slow-release fertilizer made by recycling discarded fallen leaves, the raw materials are as follows:

[0048] 100kg fallen leaf carrier powder, 250kg honey, 25kg Chinese medicine residue, 5kg microbial agent and 0.19kg compound growth promoter;

[0049] The leaf carrier powder is prepared according to the following steps: the leaf is put into water for washing, washed twice, put into an oven, heated to 60°C for drying, irradiated with ultraviolet light for 1 minute for disinfection, crushed and ground after disinfection, and sieved after grinding to obtain leaf carrier powder with a particle size range of 200 to 500 μm;

[0050] The honey has a Baume degree of 40 degrees, a water content of 23.1%, and a sugar content of 75.4%;

[0051] The Chinese medicine residue is composed of Codonopsis pilosula residue, Astragalus membranaceus residue and Licorice root residue in a weight ratio of 1:1:3, and the moisture in the Chinese medicine residue is dried to control the moisture content of the Chinese medicine residue to be 20%;

[0052] The microbial agent is prepared by mixing Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinus in an effective live bacterial count ratio of 2:1:2; the total effective live bacterial count of the microbial agent is 20 million / g;

[0053] The composite growth promoter is composed of indoleacetic acid, fulvic acid, naphthylacetic acid, urea, and potassium dihydrogen phosphate in a weight ratio of 1:5:2:100:50;

[0054] Follow these steps to make it:

[0055] The leaf carrier powder is stirred and mixed with the Chinese medicine residue, and the stirring state is maintained, and the microbial agent is sprayed. After the microbial agent is sprayed, honey is added in the stirring state, and the mixture is evenly mixed to obtain a compression molding powder;

[0056] The compression molded powder is filled in the lower mold and pressed into a semi-hollow sphere. A composite growth promoter is added to the semi-hollow sphere. The compression molded powder is then filled into the upper mold. The upper and lower molds are combined and pressed into a slow-release fertilizer with a core-shell structure.

[0057] Example 2-3

[0058] A slow-release fertilizer made by recycling discarded fallen leaves, which differs from Example 1 in that the weight ratio of the slow-release shell layer to the composite growth promoter is different;

[0059] In Example 2, the weight ratio of the sustained-release shell layer to the composite growth promoter is 3000:1;

[0060] In Example 3, the weight ratio of the sustained-release shell layer to the composite growth promoter is 1500:1.

[0061] Embodiment 4-5

[0062] A slow-release fertilizer made by recycling discarded fallen leaves is different from Example 1 in that the slow-release shell composition is different, as follows:

[0063] In Example 4, 100 kg of fallen leaf carrier powder, 220 kg of honey, 20 kg of Chinese medicine residues and 1 kg of microbial agent;

[0064] In Example 5, 100 kg of fallen leaf carrier powder, 300 kg of honey, 30 kg of Chinese medicinal residues and 10 kg of microbial agent;

[0065] Embodiment 6-7

[0066] A slow-release fertilizer made by recycling discarded fallen leaves, which differs from Example 1 in that the particle size of the fallen leaf carrier powder is different, as follows:

[0067] In Example 6, the particle size of the leaf litter carrier powder is 100 to 200 μm;

[0068] In Example 7, the particle size of the fallen leaf carrier powder is 500 to 1000 μm.

[0069] Embodiment 8-11

[0070] A slow-release fertilizer made by recycling discarded fallen leaves is different from Example 1 in that the Baume degree of honey is different, as follows:

[0071] In Example 8, the honey has a Baume degree of 38 degrees, a water content of 27.0%, and a sugar content of 71.1%;

[0072] The honey in Example 9 has a Baume degree of 39 degrees, a water content of 25.0%, and a sugar content of 73.2%;

[0073] The honey in Example 8 has a Baume degree of 41 degrees, a water content of 21.2%, and a sugar content of 77.2%;

[0074] The honey in Example 9 has a Baume degree of 42.5 degrees, a water content of 18.1%, and a sugar content of 80.3%.

[0075] Examples 12-13

[0076] A slow-release fertilizer made by recycling discarded fallen leaves is different from Example 1 in that the composition of the composite growth promoter is different, as follows:

[0077] In Example 12, the composite growth promoter is composed of urea and potassium dihydrogen phosphate in a weight ratio of 2:1;

[0078] In Example 13, the composite growth promoter is composed of indoleacetic acid, fulvic acid, and naphthylacetic acid in a weight ratio of 1:5:2.

[0079] Comparative Example

[0080] Comparative Example 1

[0081] A compound fertilizer is different from Example 1 in that fallen leaf carrier powder, honey, Chinese medicinal residues, microbial agents and compound growth promoters are directly mixed to obtain the compound fertilizer.

[0082] Comparative Example 2

[0083] A slow-release fertilizer made by recycling discarded fallen leaves is different from Example 1 in that only slow-release shell materials are used as the slow-release fertilizer.

[0084] Comparative Example 3

[0085] A slow-release fertilizer made by recycling discarded fallen leaves, which differs from Example 1 in that the particle size of the fallen leaf carrier powder is 1 to 50 μm.

[0086] Comparative Example 4

[0087] A slow-release fertilizer made by recycling discarded fallen leaves, which differs from Example 1 in that the particle size of the fallen leaf carrier powder is 10 to 20 mm.

[0088] Performance testing

[0089] Test methods

[0090] 3600 poplar seedlings were selected, with a height of 3±0.25m and a breast diameter of 4±0.5cm.

[0091] Two foundation pits were selected, one with normal soil and the other simulating saline-alkali land. 1,800 poplar seedlings were planted in each of the two pits. The poplar seedlings were planted at equal spacing. After transplanting, the poplar seedlings were watered to ensure their roots and fertilized regularly.

[0092] In a single foundation pit, 1800 poplar seedlings were divided into 18 groups, each group had 100 poplar seedlings, and the same weight of slow-release fertilizer was applied to the bottom of the poplar seedlings in the same group. The slow-release fertilizer came from Examples 1-13 and Comparative Examples 1-4, respectively. There was also a blank control group. The growth of the poplar seedlings in the two foundation pits was counted after 1 month and 1 year.

[0093] Table 1. Growth of poplar seedlings transplanted to normal soil foundation pits one month and one year later

[0094]

[0095]

[0096] Table 2. Growth of poplar seedlings transplanted to saline-alkali foundation pits one month and one year later

[0097]

[0098]

[0099] Data analysis

[0100] Combining Example 1, Comparative Examples 1-4 and the blank control group and Table 1-2, it can be seen that:

[0101] In Comparative Example 1, the composite growth promoter was directly mixed with the slow-release shell layer. Under the pouring of a large amount of root-fixing water, the composite growth promoter had an adverse effect on the root system of the seedlings, resulting in a decrease in the survival rate of the seedlings.

[0102] No composite growth promoter was added in Comparative Example 2. Although the survival rate of Comparative Example 2 was higher, the growth trend in the later stage was insufficient, and the growth of the seedlings after 1 year was not good;

[0103] In comparative example 3, the particle size of the leaf carrier powder is relatively low, and the degradation rate of the leaf carrier powder by the microbial agent is accelerated, which helps the seedling root system to be not completely repaired, and the composite growth promoter is dissolved, which has a negative impact on the root repair growth;

[0104] In Comparative Example 4, the particle size of the leaf carrier powder was too large, and the composite growth promoter was dissolved in the initial stage of slow-release fertilizer application, which increased the possibility of root burn in seedlings and reduced the survival rate of seedlings.

[0105] In the blank control group, no measures were taken to treat the poplar seedlings, and the survival rate of the seedlings was extremely low, only 24%. After one year of growth, the survival rate dropped to 14%. It can be seen that the slow-release fertilizer of the present application can significantly improve the survival rate of seedlings and promote root repair of seedlings.

[0106] Combining Examples 1-3 and Tables 1-2, it can be seen that the ratio of the slow-release shell to the composite growth promoter has a greater impact on poplar seedlings. When the amount of the slow-release shell is high, the survival rate of the seedlings is high in the early stage, but the growth trend slows down after one year; and when the amount of the slow-release shell is low, the survival rate of the seedlings is low in the early stage. The reason is that the content of the slow-release shell not only affects the repair of the seedlings' roots in the early stage, but also affects the release time of the composite growth promoter inside it. The amount of the slow-release shell is small, and the decomposition rate by the microbial agent is too fast, which easily leads to poor root recovery in the early stage of the seedlings, poor absorption of the composite growth promoter, and burnt seedlings. When the content of the slow-release shell is too high, the seedlings will not absorb enough nutrients such as nitrogen, phosphorus, and potassium in the later stage, resulting in slow plant growth and slow increase in breast diameter.

[0107] From Examples 1, 4-5 and Tables 1-2, it can be seen that when the content of the microbial agent in the slow-release shell is low, the growth trend of the seedlings is poor, the survival rate is low, and the root repair of the seedlings is poor; when the content of honey in the slow-release shell is high, the proliferation of microorganisms is affected, the metabolism of microorganisms is slow, and the recovery rate of the seedling roots is delayed.

[0108] From Table 1-2, it can be seen that the slow-release fertilizer prepared in the present application can be put into saline-alkali foundation pits for use to improve the growth trend of seedlings in the saline-alkali foundation pits. Although the growth trend of seedlings in normal foundation pits is better than that of seedlings in saline-alkali foundation pits, the survival rate and growth trend of the two after one year are not much different, indicating that the slow-release fertilizer can improve soil structure and reduce the impact of saline-alkali land on seedlings.

[0109] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A slow-release fertilizer made by recycling discarded fallen leaves, characterized in that: It is composed of a sustained-release shell layer and a core material in a weight ratio of (1500-3000):1; The sustained-release shell layer comprises the following raw materials in parts by weight: 100 parts of fallen leaf carrier powder, 220-300 parts of honey, 20-30 parts of Chinese medicine residues and 1-10 parts of microbial agents, and the core material is a composite growth promoter; The leaf litter carrier powder is obtained by washing, disinfecting and crushing the leaf litter, and has a particle size of 100 to 1000 μm; The slow-release fertilizer is prepared according to the following steps: premixing leaf carrier powder and Chinese medicine residue, spraying microbial agents uniformly on the premixed powder, adding honey and mixing, and obtaining a compression molded powder after uniform mixing; The compression molded powder is pressed into a semi-hollow sphere, a solid composite growth promoter is added into the semi-hollow sphere, and finally the compression molded powder is used for sealing the mold to obtain a slow-release fertilizer with a core-shell structure.

2. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that: The particle size of the fallen leaf carrier powder is 200 to 500 μm.

3. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that: The Chinese medicine residue is prepared by mixing astragalus, codonopsis and licorice residues in a weight ratio of (1-2): (1-2): (2-6).

4. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 3, characterized in that: The water content of the traditional Chinese medicine residue is controlled at 20-40%.

5. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that: The Baume degree of the honey is 39 to 41 degrees.

6. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 5, characterized in that: The Baume degree of the honey is 40 degrees.

7. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that The microbial agent is prepared by mixing Brevibacillus laterosporus, Bacillus megaterium and Bacillus gelatinus according to the effective live bacterial count ratio of (1-2): (0.5-1): (1-2).

8. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that The composite growth promoter is composed of indoleacetic acid, fulvic acid, naphthylacetic acid, urea and potassium dihydrogen phosphate in a weight ratio of (1-2): (5-10): (2-4): (100-200): (50-100).

9. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that The weight ratio of the fallen leaf carrier powder, honey, Chinese medicinal residues and microbial agent is 100:250:25:

5.

10. The slow-release fertilizer made by recycling discarded fallen leaves according to claim 1, characterized in that The sustained-release shell layer and the core material are made according to a weight ratio of 2000:1.

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