Organic compound fertilizer suitable for growth of tea trees and preparation method of organic compound fertilizer

Abstract

The invention discloses an organic compound fertilizer suitable for growth of tea trees in the technical field of fertilizers, which is prepared by composting and maturing residual branches and leaves and fallen leaves trimmed from tea trees, animal waste, fish pond mud and other organic materials; the nutrient elements of nitrogen (N), phosphorus (P) and potassium (K) and the important microelements of iron (Fe), manganese (Mn), zinc (Zn), copper (Cu) and boron (B) required by the growth of the tea trees are added according to a proper proportion. The fertilizer has comprehensive nutrients and lasting fertilizer efficiency, improves soil, is environment-friendly and safe, and can significantly improve the nutrient content and organic matter content of tea garden soil and improve the yield and quality of tea leaves.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to an organic compound fertilizer suitable for growing tea trees and a preparation method thereof. Background Art

[0002] China is the land of tea, and tea trees are a key cash crop, their growth influenced by a combination of climatic factors. Tea trees prefer temperatures between 15°C and 30°C, require 1,000 to 2,000 mm of annual rainfall, adapt to moderate sunlight (avoiding strong sunlight), and require moderate humidity. Meitan County, located east of Zunyi City, Guizhou Province, has a subtropical monsoon humid climate. At an altitude of approximately 1,000 meters, the county boasts an average annual temperature of 15°C to 20°C, an annual accumulated temperature of 4,400 to 4,900°C, a frost-free period of 284 days, annual rainfall of 1,100 to 1,250 mm, a relative humidity of 80%, and annual sunshine hours of 1,100 to 1,300 hours. These unique geographical and climatic conditions create an ideal environment for tea growth, contributing to the exceptional quality of Meitan tea.

[0003] Tea is rich in bioactive substances such as tea polyphenols, amino acids, caffeine, and tea pigments, as well as minerals such as potassium, calcium, magnesium, iron, and zinc. Tea has antioxidant, mentally revitalizing, immune-boosting, and cardiovascular health-protecting properties. Tea plants require a variety of nutrients for growth and development, including nitrogen (N), phosphorus (P), potassium (K), iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), and boron (B). Nitrogen, phosphorus, and potassium are particularly abundant, necessitating the addition of large amounts of these three chemical fertilizers.

[0004] While traditional chemical fertilizers can partially meet the nutritional needs of tea plants, long-term use has significant drawbacks. They can damage soil structure, compacting it, reducing aeration and water permeability, and hindering root growth and nutrient absorption. They can also disrupt soil nutrient balance, causing acidification or alkalinization, and reducing soil fertility. Furthermore, nutrients are easily lost, polluting water and air, and causing significant environmental damage.

[0005] Organic materials have been receiving more and more attention in recent years because they can improve the soil environment and enhance soil fertility, and they have positive significance in promoting the healthy growth of tea trees and improving the quality of tea. However, existing organic materials still expose many problems in practical applications. From the perspective of nutrient content, existing organic materials generally have insufficient nutrient content, which is difficult to fully meet the needs of tea trees for nitrogen, phosphorus, potassium and trace elements. This directly leads to slow growth of tea trees, low tea yield and poor quality. In terms of fertilizer efficiency, the fertilizer effect of most organic materials lasts for a short time and cannot continuously and stably supply nutrients throughout the entire growth cycle of the tea tree. Tea trees are prone to nutrient deficiency in the later stages of growth, affecting the normal growth of tea trees and the final quality of tea. Furthermore, some organic materials on the market do not fully consider the special growth characteristics of tea trees, such as their preference for acid and fear of alkali, preference for aluminum and dislike of calcium, in their formula design, and the effect in improving tea yield and quality is not satisfactory.

[0006] Therefore, it is urgent to develop an organic compound fertilizer that is rich in nutrients, has long-lasting fertilizer effect and is specifically adapted to the growth characteristics of tea trees, and its preparation method. This is of great significance to promoting the sustainable development of the tea industry, improving tea production and quality, and increasing tea farmers' income. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention designs an organic compound fertilizer specially adapted to the growth characteristics of tea trees.

[0008] One of the purposes of the present invention is to provide an organic compound fertilizer suitable for growing tea trees, comprising the following raw materials in parts by weight: 900-950 parts of organic matter, 25-50 parts of a three-element fertilizer, and 0.01-0.04 parts of trace elements, wherein the organic matter comprises composted leaves and branches obtained from tea tree pruning, animal feces, and fish pond mud; the three-element fertilizer comprises nitrogen fertilizer, phosphorus fertilizer, and potash fertilizer; and the trace elements comprise iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), and boron (B). The fish pond mud contains fish feces rich in organic matter.

[0009] Preferably, an organic compound fertilizer suitable for growing tea trees is composed of the following raw materials in parts by weight: 400-600 parts of residual branches and fallen leaves obtained by pruning tea trees, 600-800 parts of animal feces and 400-600 parts of fish pond mud, organic matter obtained by composting after appropriately drying and reducing the weight to approximately half, 15-25 parts of nitrogen fertilizer, 5-15 parts of phosphorus fertilizer, 5-10 parts of potassium fertilizer, 0.01-0.02 parts of Fe, 0.01-0.02 parts of Mn, 0.001-0.002 parts of Zn, 0.001-0.002 parts of Cu, and 0.0001-0.0002 parts of B.

[0010] Preferably, an organic compound fertilizer suitable for growing tea trees is composed of the following raw materials in parts by weight: 400 parts of residual branches and leaves obtained by pruning tea trees, 600 parts of animal feces, 400 parts of fish pond mud, 15 parts of nitrogen fertilizer, 10 parts of phosphate fertilizer, 10 parts of potassium fertilizer, 0.01 part of Fe, 0.01 part of Mn, 0.001 part of Zn, 0.001 part of Cu and 0.0001 part of B.

[0011] Preferably, an organic compound fertilizer suitable for growing tea trees is composed of the following raw materials in parts by weight: 600 parts of residual branches and leaves obtained by pruning tea trees, 800 parts of animal feces, 600 parts of fish pond mud, 25 parts of nitrogen fertilizer, 15 parts of phosphate fertilizer, 10 parts of potassium fertilizer, 0.02 parts of Fe, 0.02 parts of Mn, 0.002 parts of Zn, 0.002 parts of Cu and 0.0002 parts of B.

[0012] Working principle and beneficial effects of the invention: The present invention uses organic materials such as the residual branches and leaves and fallen leaves of tea trees pruned, animal feces, and fish pond mud as raw materials, obtains organic matter after composting and decomposition, and adds appropriate amounts of nitrogen, phosphorus, and potassium as the main nutrients, as well as iron, manganese, zinc, copper, and boron as the trace elements required for the growth of tea trees. The organic compound fertilizer makes full use of the residual branches and leaves and fallen leaves of tea trees pruned, animal feces, and fish pond mud as organic materials, and adds appropriate amounts of nitrogen, phosphorus, and potassium as the nutrients, as well as iron, manganese, zinc, copper, and boron as the trace elements required for the growth of tea trees, to supplement the shortcomings of organic fertilizers in the slow and long-lasting release of nitrogen, phosphorus, and potassium, as well as the lack of trace elements. The organic compound fertilizer has comprehensive nutrients, long-lasting fertilizer effect, and is environmentally friendly and safe. It can meet the nutrient needs of tea trees, improve soil structure, and increase tea yield and quality.

[0013] Furthermore, the animal manure is one or more combinations of cow manure, sheep manure, and pig manure.

[0014] Furthermore, the nitrogen fertilizer is one or a combination of urea and ammonium nitrate, the phosphate fertilizer is one or a combination of superphosphate and diammonium hydrogen phosphate, and the potash fertilizer is potassium sulfate.

[0015] A second object of the present invention is to provide a method for preparing an organic compound fertilizer suitable for growing tea trees, comprising the following steps:

[0016] The following steps are involved:

[0017] Step 1: Raw material selection and pretreatment: Pre-treat the pruned branches and leaves of tea trees, animal feces, and fish pond mud to remove impurities and crush or air-dry / dry to a suitable moisture content;

[0018] Step 2: Composting: Mix the pre-treated raw materials evenly and compost them for 2 to 3 months.

[0019] Step 3: Adding and mixing fertilizer nutrients: Grind the material obtained in step 2 to obtain organic matter, add commercially available nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer in proportion, and mix well;

[0020] Step 4: Adding and mixing trace elements: Add commercially available Fe, Mn, Zn, Cu and B trace elements in proportion to the material obtained in step 3 and mix well;

[0021] Step 5: Detect the pH value of the organic compound fertilizer obtained in step 4 above, add wood ash or sodium dihydrogen phosphate, and adjust the pH of the compound fertilizer to 4.5-5.0; simply package the homemade organic compound fertilizer and store it for use.

[0022] In step 4, the trace element fertilizers of Fe, Mn, Zn, Cu and B are selected from commercially available ferrous sulfate, manganese sulfate, zinc sulfate, ketone sulfate and borax.

[0023] Composting in step two is typically done indoors during the off-season (October to December) when tea plantations are less busy. The average temperature in Meitan County is approximately 15-20°C. During composting, temperatures typically reach 35-60°C. Higher temperatures (50-60°C) allow for full fermentation and degradation of organic matter, effectively killing pests. Regular temperature monitoring is performed to check if the compost exceeds 60°C, requiring turning and cooling.

[0024] Furthermore, the preparation method of the present invention is specifically as follows:

[0025] Step 1: Raw material selection and pretreatment: (1) Collection and processing of pruned tea leaves and fallen leaves: Collect pruned tea leaves and fallen leaves from the tea garden, remove impurities, and crush them to improve the decomposition efficiency during the composting process; (2) Collection and processing of animal manure: Select fresh cow dung, sheep dung, pig dung and other animal dung, and dry them in the sun or by drying them to reduce the weight to 40% of the original weight, thereby improving the fermentation efficiency during the composting process; (3) Collection of fish pond mud: Collect the mud at the bottom of the fish pond that is rich in fish dung and other organic matter, and dry it in the sun or by drying it to remove excess water for use in composting;

[0026] Step 2, composting and decomposing: the pre-treated tea tree pruning residues and fallen leaves, animal feces, and fish pond mud are mixed evenly in a certain proportion and piled in a well-ventilated place for composting and decomposition. During the composting process, the pile is turned regularly to promote full fermentation and decomposition of the materials. The composting time is 2 to 3 months, until the material turns black in color and has a loose texture, and organic matter is obtained;

[0027] Step 3: Adding fertilizer and mixing nutrients: Crush the organic matter and add commercially available three-nutrient fertilizer to make a mixed fertilizer to supplement the slow nutrient release in the compost. The addition ratio is: organic matter obtained in step 2: commercially available nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer in a ratio of 95:5 to 90:10.

[0028] Step 4: Adding and mixing trace elements: According to the trace element requirements of tea plant growth, add appropriate amounts of Fe, Mn, Zn, Cu and B trace elements, and fully mix all materials to prepare an organic compound fertilizer for tea plants; the total amount of Fe, Mn, Zn, Cu and B trace elements added is 0.01-0.04% of the total weight of the organic compound fertilizer;

[0029] Step 5: Detect the pH value of the organic compound fertilizer obtained in step 4 above, add wood ash or sodium dihydrogen phosphate, and adjust the pH of the compound fertilizer to 4.5-5.0; simply package the homemade organic compound fertilizer and store it for use.

[0030] Compared with the prior art, the present invention has the following beneficial effects: Comprehensive nutrients: The nutrients of the present invention are mainly derived from the addition of appropriate amounts of nitrogen, phosphorus, potassium nutrients and trace elements iron (Fe), manganese (Mn), zinc (Zn), copper (Cu) and boron (B) required for the growth of tea trees, to prepare a comprehensive nutrient organic compound fertilizer for tea trees, which can meet the needs of tea trees for various nutrients during their growth. Long-lasting fertilizer effect: The present invention adopts composting and decomposition technology to convert organic materials such as pruned tea branches and leaves, animal feces, and fish pond mud into stable organic matter, thereby improving the fertilizer effect durability. At the same time, organic matter can also improve soil structure, improve soil water and fertilizer retention capacity, and promote the growth and development of tea tree roots. Improved soil: The organic matter and microbial agents in the present invention can improve the soil microecological environment and promote the circulation and release of soil nutrients. Long-term use of the tea tree organic compound fertilizer prepared by the present invention can gradually improve the soil structure of the tea garden and improve soil fertility. Environmental protection and safety: The present invention mainly uses natural organic materials as raw materials, which can greatly reduce the use of chemical fertilizers and reduce the risk of agricultural non-point source pollution. Improve tea quality: The tea tree organic compound fertilizer prepared by the present invention can fully meet the nutrient needs of tea tree growth, promote the healthy growth of tea trees, and improve the yield and quality of tea. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a photo of the crown of the Qiantan 601 tea tree variety that was applied with the organic compound fertilizer of the present invention in mid-April, and the tea leaves are growing well. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to specific examples, which are merely illustrative and are not intended to limit the scope of the present invention.

[0033] The experimental sites were selected from the service base of science and technology special envoys, and mature tea gardens with 5-year tea tree growth period in Shilian Town and Meijiang Street, Meitan County, Zunyi City, Guizhou Province.

[0034] Example 1

[0035] Raw material selection and pretreatment

[0036] In late October, 600 kg of pruned tea tree branches and fallen leaves were collected from the tea garden, removed impurities, and then crushed. 200 kg of fresh cow dung, 200 kg of sheep dung, 400 kg of pig dung, and 600 kg of fish pond mud were selected, removed impurities, and aired to reduce the moisture content to 50% of the original weight.

[0037] Compost maturity

[0038] Pre-treated tea tree pruning debris and fallen leaves, animal feces, and fish pond mud are mixed evenly in a certain proportion and piled in a well-ventilated area for composting. During the composting process, the temperature is monitored and the pile is turned every five days to promote full fermentation and decomposition, reaching a temperature of 35-60°C. The composting process is allowed to mature for two to three months, until the material turns dark and has a loose texture. 1000 kg of mature compost is then dried.

[0039] Nutrient addition and mixing

[0040] The composted material was pulverized and inorganic fertilizers such as 25 kg of urea nitrogen fertilizer, 15 kg of superphosphate phosphate fertilizer, and 10 kg of potassium sulfate were added. Trace elements were also added, including 0.01 kg of ferrous sulfate, 0.01 kg of manganese sulfate, 0.001 kg of zinc sulfate, 0.001 kg of copper sulfate, and 0.0001 kg of borax. All materials were thoroughly mixed to prepare approximately 1050 kg of organic compound fertilizer for tea trees.

[0041] Product testing and packaging

[0042] The pH value of the prepared tea tree organic compound fertilizer is tested and is approximately around 4.5. The fertilizer is packaged for easy storage and use.

[0043] Example 2

[0044] The method is basically the same as Example 1, except that the raw material ratio and nutrient addition amount are adjusted. Specifically, 500 kg of tea tree branches and fallen leaves pruned from the tea garden are collected, 400 kg of fresh cow dung and 600 kg of pig manure are selected, and after removing impurities, they are air-dried; 500 kg of soil is collected from the bottom of the fish pond. After reducing the moisture content to 50% of the original weight, the compost is matured and dried to produce 1000 kg of organic matter, to which inorganic fertilizers such as 40 kg of urea nitrogen fertilizer, 25 kg of superphosphate phosphate fertilizer, and 15 kg of potassium sulfate are added. Trace elements are then added, including 0.02 kg of ferrous sulfate, 0.02 kg of manganese sulfate, 0.002 kg of zinc sulfate, 0.002 kg of copper sulfate, and 0.0002 kg of borax. All materials are thoroughly mixed to prepare about 1080 kg of organic compound fertilizer for tea trees.

[0045] Example 3

[0046] The method is essentially the same as Examples 1 and 2, except that the raw material selection and composting time are adjusted. Specifically, 300 kg of tea tree branches and fallen leaves pruned from the tea garden were collected, 1000 kg of fresh pig manure was selected, and after removing impurities, 300 kg of soil from the bottom of the fish pond was collected and dried; the moisture content was reduced to 50% of its original weight. The composting time was extended to 3 months. The nutrient addition ratios were the same as above.

[0047] Example 3: Experimental results verification

[0048] To verify the effectiveness of the tea organic compound fertilizer prepared in this invention, field trials were conducted. The test sites were selected: mature tea plantations in Shilian Town and Meijiang Subdistrict, Meitan County, Zunyi City, Guizhou Province. The tea varieties were Qianmei 601. Each tea plot covered one mu (approximately 1 mu) of land, with trees of the same variety and six years of age. This experiment employed a single-factor design to examine the effects of different base fertilizers on single-bud fresh leaf yield and single-bud oven-drying weight.

[0049] Blank control: No fertilizer was applied.

[0050] The traditional control plot, experimental plots 1, and 2 all received one base fertilizer application and three topdressing applications. The timing and type of topdressing were the same for all three applications, but the amount of three-element chemical fertilizer used in experimental plots 1 and 2 was half that of the traditional control plot.

[0051] The method of applying basal fertilizer is to dig trenches in late December. That is, fertilizer is applied at the outer edge of the tea tree crown projection and 25 to 35 cm outside the tea tree roots. Dig trenches 20 to 30 cm deep and 25 to 30 cm wide to avoid damaging the tea tree roots. Apply fertilizer in the trenches and cover with 5 cm of soil.

[0052] Traditional comparison:

[0053] The base fertilizer used was 25 kg of traditional three-element fertilizer (urea nitrogen fertilizer: phosphorus fertilizer superphosphate: potassium sulfate fertilizer in a ratio of 25:15:10, purchased commercially and mixed accordingly). The base fertilizer application method is described in detail above.

[0054] Topdressing methods are as follows: First: 1 month before spring tea harvest in late February, apply 10 kg of commercially available urea per mu (purchased); Second: 2 weeks after spring tea harvest in mid-May, apply 8 kg of a three-nutrient fertilizer per mu (urea nitrogen fertilizer: phosphorus fertilizer superphosphate: potassium sulfate fertilizer in a ratio of 25:15:10, purchased commercially and mixed accordingly); Third: 1.5 months before autumn tea harvest in late July, apply 7 kg of urea per mu. Topdressing is a 0.1% aqueous solution of the three-nutrient fertilizer applied to the soil around the base of the tea trees.

[0055] Experimental site 1:

[0056] The base fertilizer used was 500 kg of the organic compound fertilizer prepared in Example 1 of the present invention. The base fertilizer application method is described in detail above.

[0057] Topdressing methods are as follows: First: 1 month before spring tea harvest in late February, apply 5kg of commercially available urea per mu (5kg per mu); Second: 2 weeks after spring tea harvest in mid-May, apply 4kg per mu of triple fertilizer (urea nitrogen fertilizer: phosphorus fertilizer superphosphate: potassium sulfate fertilizer in a ratio of 25:15:10, purchased commercially and mixed accordingly); Third: 1.5 months before autumn tea harvest in late July, apply 3.5kg per mu of urea. Topdressing is a 0.1% aqueous solution of the triple fertilizer applied to the soil around the base of the tea trees.

[0058] Experimental site 2:

[0059] The base fertilizer used was 500 kg of the organic compound fertilizer prepared in Example 2 of the present invention. The base fertilizer application method is described in detail above.

[0060] Topdressing methods are as follows: First: 1 month before spring tea harvest in late February, apply 5kg of commercially available urea per mu (5kg per mu); Second: 2 weeks after spring tea harvest in mid-May, apply 4kg per mu of triple fertilizer (urea nitrogen fertilizer: phosphorus fertilizer superphosphate: potassium sulfate fertilizer in a ratio of 25:15:10, purchased commercially and mixed accordingly); Third: 1.5 months before autumn tea harvest in late July, apply 3.5kg per mu of urea. Topdressing is a 0.1% aqueous solution of the triple fertilizer applied to the soil around the base of the tea trees.

[0061] During the experiment, the same routine management was carried out on the blank control plot, traditional control plot, and Experimental Plots 1 and 2 of the tea garden, including pruning, irrigation, pest and disease control, etc.; for all tea garden experimental plots, the tea picking time and picking method were the same, specifically, single tea buds were picked in time according to the growth conditions from March to October.

[0062] The experimental results are shown in Table 1:

[0063]

[0064]

[0065] The test results show that the tea yield of tea trees in the tea garden using the organic compound fertilizer prepared by the present invention increased by 18.9-21.6% compared with the traditional fertilization control area, and the dry weight of single buds increased by 5.3-6.2%, and increased by 41.3-44.4% compared with the unfertilized control area, and the dry weight of single buds increased by 8.6-9.4%.

[0066] The tea garden using the organic compound fertilizer prepared by the present invention has significantly better tea yield and quality than traditional chemical fertilizers and unfertilized treatments; it can be seen that the organic compound fertilizer of the present invention can sustainably and effectively improve the soil fertility of the Meitan tea garden. Due to the same climate and soil conditions in various towns and villages in Meitan County, the organic compound fertilizer of the present invention is also suitable for tea varieties such as Fuding Dabai, Meitan Moss Tea, Qianmei No. 701, and Zhongcha No. 108 planted in Meitan County. The above is only an embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can also be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application should be based on the content of its claims, and the specific implementation methods in the specification can be used to explain the content of the claims.

Claims

1. An organic compound fertilizer suitable for growing tea trees, characterized in that: The invention comprises the following raw materials in parts by weight: 900-950 parts of organic matter, 25-50 parts of three-element chemical fertilizer and 0.01-0.04 parts of trace elements, wherein the organic matter comprises residual branches and leaves obtained by pruning tea trees, animal excrement and fish pond mud, which are dried to half their weight and then composted; the three-element chemical fertilizer comprises nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer; and the trace elements comprise Fe, Mn, Zn, Cu and B.

2. An organic compound fertilizer suitable for tea tree growth according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 400-600 parts of residual branches and fallen leaves obtained by pruning tea trees, 600-800 parts of animal feces and 400-600 parts of fish pond mud, organic matter obtained by composting after drying until the weight is reduced by half, 15-25 parts of nitrogen fertilizer, 5-15 parts of phosphorus fertilizer, 5-10 parts of potassium fertilizer, 0.01-0.02 parts of Fe, 0.01-0.02 parts of Mn, 0.001-0.002 parts of Zn, 0.001-0.002 parts of Cu and 0.0001-0.0002 parts of B.

3. An organic compound fertilizer suitable for tea tree growth according to claim 1, characterized in that: The animal excrement is one or more combinations of cow excrement, sheep excrement and pig excrement.

4. The organic compound fertilizer suitable for tea tree growth according to claim 1, characterized in that: The nitrogen fertilizer is one or more combinations of urea and ammonium nitrate, the phosphate fertilizer is one or more combinations of superphosphate and diammonium hydrogen phosphate, and the potash fertilizer is potassium sulfate.

5. The method for preparing an organic compound fertilizer suitable for tea tree growth according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Raw material selection and pretreatment: Pre-treat the pruned branches and leaves of tea trees, animal feces, and fish pond mud to remove impurities and crush or air-dry / dry to a suitable moisture content; Step 2: Composting: Mix the pre-treated raw materials evenly and compost them for 2 to 3 months. Step 3: Adding and mixing fertilizer nutrients: Grind the material obtained in step 2 to obtain organic matter, add commercially available nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer in proportion, and mix evenly; Step 4: Adding and mixing trace elements: Add commercially available Fe, Mn, Zn, Cu and B trace elements in proportion to the material obtained in step 3 and mix well; Step 5: Detect the pH value of the organic compound fertilizer obtained in step 4 above, add wood ash or sodium dihydrogen phosphate, and adjust the pH of the compound fertilizer to 4.5-5.

0.

6. The method for preparing organic compound fertilizer according to claim 5, wherein The following steps are involved: Step 1: Raw material selection and pretreatment: (1) Collection and processing of pruned tea leaves and fallen leaves: Collect pruned tea leaves and fallen leaves from the tea garden, remove impurities, and crush them to improve the decomposition efficiency during the composting process; (2) Collection and processing of animal manure: Select fresh cow dung, sheep dung, pig dung and other animal dung, and dry them in the sun or by drying them to reduce the weight to 40% of the original weight, thereby improving the fermentation efficiency during the composting process; (3) Collection of fish pond mud: Collect the mud at the bottom of the fish pond that is rich in fish dung and other organic matter, and dry it in the sun or by drying it to remove excess water for use in composting; Step 2, composting and decomposing: the pre-treated tea tree pruning residues and fallen leaves, animal feces, and fish pond mud are mixed evenly in a certain proportion and piled in a well-ventilated place for composting and decomposition. During the composting process, the pile is turned regularly to promote full fermentation and decomposition of the materials. The composting time is 2 to 3 months, until the material turns black in color and has a loose texture, and organic matter is obtained; Step 3: Adding fertilizer and mixing nutrients: Crush the organic matter and add commercially available three-nutrient fertilizer to make a mixed fertilizer to supplement the slow nutrient release in the compost. The addition ratio is: organic matter obtained in step 2: commercially available nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer in a ratio of 95:5 to 90:

10. Step 4: Adding and mixing trace elements: According to the trace element requirements of tea plant growth, add appropriate amounts of Fe, Mn, Zn, Cu and B trace elements, and mix all materials thoroughly to prepare an organic compound fertilizer for tea plants; the total amount of trace elements added is 0.01-0.04% of the total weight of the organic compound fertilizer; Step 5: Detect the pH value of the organic compound fertilizer obtained in step 4 above, add wood ash or sodium dihydrogen phosphate, and adjust the pH of the compound fertilizer to 4.5-5.

0.

7. The preparation method according to claim 6, characterized in that: During the composting process in step b), the compost is turned over every 5 to 10 days to promote full fermentation and decomposition of the materials.

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