Compound fertilizer for increasing yield of avocados

Abstract

The invention discloses a compound fertilizer for increasing the yield of avocados, and belongs to the technical field of fertilizer preparation. The compound fertilizer for increasing the yield of avocados comprises the following raw materials in parts by mass: 30-40 parts of corn straw, 20-25 parts of chicken manure, 10-15 parts of plant ash, 5-8 parts of kaolin, 3-4 parts of potassium citrate, 2-3 parts of sodium alginate, 1-2 parts of compound microorganisms, 4-6 parts of microbial particles, 20-25 parts of urea, 3-6 parts of potassium chloride, 4-5 parts of potassium sulfate, 5-8 parts of fulvic acid, 2-3 parts of magnesium chloride and 3-4 parts of dandelion extract. The compound fertilizer provided by the invention can reduce the morbidity of avocado root rot to 5-10%, and can significantly increase the yield of avocado.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer preparation, in particular to a compound fertilizer for increasing the yield of avocado. Background Art

[0002] Avocado Perseaamericana Mill., also known as avocado, avocado, camphor pear, and happy fruit, is a perennial evergreen tree of the genus Persea in the Lauraceae family. It is an emerging tropical and subtropical fruit tree that integrates grain, oil, and fruit. Because its fruit is rich in nutrition, has the characteristics of high unsaturated fatty acids, high protein, high calories, and low sugar, and is rich in vitamins and minerals, it is known as "nutritional fruit" and "forest butter". Avocado has a high fat content and contains a large amount of enzymes. It has the effect of strengthening the stomach and clearing the intestines, and has important physiological functions such as lowering cholesterol and blood lipids, protecting the cardiovascular and liver systems. Therefore, avocado, as a healthy food, is deeply loved by consumers, but the planting range of avocado is small and the price is expensive, which is difficult to meet the needs of consumers. At the same time, avocado is prone to root rot, which is one of the main diseases in the production and planting of avocado, which seriously affects the yield and quality of avocado and restricts the development of the avocado industry.

[0003] At present, the main way to increase the yield of avocados is to apply chemical fertilizers. However, applying a large amount of chemical fertilizers will cause a sharp increase in the inorganic content in the soil, weaken the organic matter, cause an imbalance of trace elements, and make crop diseases and insect pests increasingly serious, which is not conducive to the healthy development of the avocado planting industry. Avocado root rot is currently mainly controlled by chemical agents. Although it can achieve the prevention and control of root rot to a certain extent, it will inevitably damage the tree, resulting in reduced immunity and weaker growth potential, which is easy to form a vicious cycle. Summary of the invention

[0004] The purpose of the present invention is to provide a compound fertilizer for increasing the yield of avocado, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention is a compound fertilizer for improving the yield of avocado, comprising the following raw materials in parts by weight: 30-40 parts of corn stalks, 20-25 parts of chicken manure, 10-15 parts of wood ash, 5-8 parts of kaolin, 3-4 parts of potassium citrate, 2-3 parts of sodium alginate, 1-2 parts of composite microorganisms, 4-6 parts of microbial granules, 20-25 parts of urea, 3-6 parts of potassium chloride, 4-5 parts of potassium sulfate, 5-8 parts of fulvic acid, 2-3 parts of magnesium chloride and 3-4 parts of dandelion extract.

[0007] Furthermore, the composite microorganism comprises the following components in parts by weight: 5 to 8 parts of actinomycetes, 4 to 6 parts of photosynthetic bacteria, 4 to 5 parts of Paenibacillus polymyxa and 8 to 10 parts of Bacillus subtilis.

[0008] Actinomycetes can strengthen the structure of plant cell membranes, maintain their stability and integrity, and thus improve the ability of plants to resist freezing when freezing damage suddenly strikes. In addition, actinomycetes also have the functions of promoting plant growth, improving crop disease resistance, detoxification, and drought resistance. These functions work together to help plants adapt to adverse environments and improve their resistance to stress.

[0009] Photosynthetic bacteria can produce abundant physiologically active substances, such as proline, uracil, cytosine, vitamins, coenzyme Q, carotenoids, etc., which can be directly absorbed by plants, help improve plant nutrition, activate the activity of plant cells, promote root development, and enhance photosynthesis and reproductive growth capabilities.

[0010] Fulvic acid and magnesium chloride can promote the absorption and utilization of nutrients by plants, including trace elements such as magnesium, which help to improve the photosynthesis efficiency of plants and thus increase the chlorophyll content.

[0011] The photosynthetic bacteria work together with fulvic acid and magnesium chloride to improve the photosynthesis and reproductive growth capacity of plants, thereby improving the ability of plants to resist adverse environments.

[0012] Bacillus subtilis can sense the defense response of plants and promote the production of antimicrobial peptides, enzymes and other antigenic proteins in plants. These substances can increase the resistance of plants to pathogenic microorganisms.

[0013] Bacillus polymyxa can produce antibiotics, which can enhance the permeability of plant cell membranes, increase the secretions of plant roots, thereby facilitating the attachment of microorganisms, improving the ability of beneficial microorganisms to colonize in plants, and thus improving the ability of plants to resist diseases.

[0014] Furthermore, the microbial granules include the following raw materials in parts by mass: 3-4 parts of Bacillus Velezii, 6-8 parts of Trichoderma harzianum, 2-3 parts of Pseudomonas aeruginosa, 20-30 parts of gelatin powder and 30-40 parts of peanut cake powder.

[0015] Furthermore, the method for preparing the microbial particles comprises the following steps:

[0016] The raw materials are mixed evenly and then sprayed with starch solution, and composite particles are obtained after low-temperature granulation;

[0017] The starch solution is sprayed on the surface of the composite particles and the activated carbon powder is wrapped, and then the chitosan solution is sprayed, and the microbial particles are obtained after low-temperature drying.

[0018] Furthermore, the mass ratio of the composite particles to the activated carbon powder is 10:(2-3);

[0019] The usage ratio of the composite particles to the chitosan solution is 10g:1.5-2.5mL.

[0020] Bacillus Velez can produce β-1,3-glucanase, which can directly cleave the β-1,3-glucan component in the cell wall of Phytophthora, destroy the complete structure of the cell wall, and then inhibit the infection of Phytophthora to avocados and avoid the occurrence of root rot. Bacillus Velez also has a competitive effect with pathogens, including nutritional competition and spatial competition. Through rapid growth and reproduction, it seizes nutrients and water, occupies space, consumes oxygen, etc., thereby weakening and eliminating certain pathogens in the same living environment.

[0021] Trichoderma harzianum can produce a variety of biologically active substances, which not only have antagonistic effects on plant pathogenic fungi, bacteria and insects, but also have the ability to promote the growth of other fungi. Trichoderma harzianum can produce biologically active substances such as cell wall degrading enzymes and secondary metabolites, which can not only inhibit the growth and reproduction of pathogens, but also promote plant growth and increase the yield of agricultural products.

[0022] Pseudomonas aeruginosa can decompose harmful substances remaining in the soil, including residues of fertilizers and pesticides, as well as decompose harmful rhizosphere secretions accumulated in the soil.

[0023] Making Bacillus Velez, Trichoderma harzianum and Pseudomonas aeruginosa into microbial granules can ensure their vitality in the soil, increase their number and survival stability in the soil, and thus can play a long-term role in preventing and controlling diseases and decomposing harmful substances in the soil, reduce the damage of harmful substances in the soil to trees, and improve the prevention and control of root rot.

[0024] Furthermore, the preparation method of the dandelion extract comprises the following steps:

[0025] The dandelion is crushed, and then an ethanol solution is added, and the mixture is heated under reflux for extraction and then filtered, and the filtrate is evaporated and concentrated to obtain the dandelion extract.

[0026] Furthermore, the concentration of the ethanol solution is 80-90 vol. %; and the time of the heating reflux extraction is 2-3 h.

[0027] Dandelion extract has a good inhibitory effect on the spore germination and mycelium growth of pathogens.

[0028] The second technical solution of the present invention is a method for preparing the above-mentioned compound fertilizer, comprising the following steps:

[0029] (1) mixing corn stalks, chicken manure, wood ash and composite microorganisms uniformly and then piling and fermenting to obtain fermented fertilizer;

[0030] (2) mixing the fermented fertilizer and raw materials other than the microbial granules uniformly, crushing and granulating the mixture to obtain fertilizer granules;

[0031] (3) The fertilizer particles and the microorganism particles are mixed evenly to obtain the compound fertilizer.

[0032] Furthermore, the temperature of the pile fermentation is 35-45°C and the time is 15-20 days;

[0033] The particle size of the granulation is 2 to 4 mm.

[0034] The third technical solution of the present invention: an application of the above-mentioned compound fertilizer in increasing the yield of avocado.

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

[0036] (1) The compound fertilizer of the present invention can reduce the incidence of avocado root rot to 5-10%, and can significantly increase the yield of avocado.

[0037] (2) The compound fertilizer of the present invention comprises inorganic fertilizer, microorganism and organic fertilizer, which improves the nutrient elements of the fertilizer, promotes the absorption and conversion of fertilizer by the avocado tree, improves the fertilizer utilization efficiency, improves the soil quality, increases the soil fertility, and reduces the pollution of fertilizer to the environment. The production cost is low, the process is simple and easy to use, and it has good economic and environmental benefits. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0039] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0040] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0041] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0042] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0043] The “parts” described in the following examples are all “parts by mass”.

[0044] The actinomycetes, photosynthetic bacteria, Bacillus polymyxa, Bacillus subtilis, Bacillus velez, Trichoderma harzianum, Pseudomonas aeruginosa, yeast, and Bacillus amyloliquefaciens used in the present invention are all commercially available. 8 cfu / g, the effective viable count of photosynthetic bacteria is 3.0×10 9 cfu / g, the effective viable count of Paenibacillus polymyxa is 1.0×10 9 cfu / g, the effective viable count of Bacillus subtilis is 4.0×10 10 cfu / g, the effective viable count of Bacillus Velezii was 6.0×10 10 cfu / g, the effective viable count of Trichoderma harzianum was 1.0×10 9 cfu / g, the effective viable count of Pseudomonas aeruginosa was 6.0×10 6 cfu / g, the effective viable count of yeast is 5.0×10 8 cfu / g, the effective viable count of Bacillus amyloliquefaciens was 5.0×10 10 cfu / g.

[0045] Example 1

[0046] A compound fertilizer for increasing avocado yield:

[0047] (1) A compound fertilizer for increasing avocado yield, comprising the following raw materials in parts by weight: 35 parts of corn stalks, 25 parts of chicken manure, 10 parts of wood ash, 6 parts of kaolin, 4 parts of potassium citrate, 2.5 parts of sodium alginate, 1.5 parts of composite microorganisms, 6 parts of microbial granules, 25 parts of urea, 5 parts of potassium chloride, 4 parts of potassium sulfate, 8 parts of fulvic acid, 2 parts of magnesium chloride and 4 parts of dandelion extract.

[0048] The composite microorganism is composed of the following components in parts by mass: 6 parts of actinomycetes, 4 parts of photosynthetic bacteria, 4.5 parts of Bacillus polymyxa and 10 parts of Bacillus subtilis.

[0049] (2) Preparation method of microbial particles:

[0050] A. Microbial granules are composed of the following raw materials in parts by weight: 4 parts of Bacillus Velezii, 6 parts of Trichoderma harzianum, 3 parts of Pseudomonas aeruginosa, 25 parts of gelatin powder and 40 parts of peanut cake powder.

[0051] B. After the raw materials are evenly mixed, a starch aqueous solution with a concentration of 2 wt.% is sprayed, and low-temperature granulation (temperature is 40° C., and the granulation particle size is 2 mm) is performed to obtain composite particles;

[0052] C. Spray a 2 wt.% starch aqueous solution on the surface of the composite particles, then wrap the activated carbon powder (the average particle size of the activated carbon powder is 10 μm, and the mass ratio of the composite particles to the activated carbon powder is 10:2.5), dry at low temperature (40°C), spray with a chitosan solution (the ratio of the composite particles to the chitosan solution is 10 g:2.5 mL), and dry at low temperature (40°C) to obtain microbial particles.

[0053] The preparation method of the chitosan solution is as follows: adding chitosan to a glacial acetic acid solution with a concentration of 1 vol.% to make the chitosan concentration be 2 wt.%, heating and stirring to dissolve, and preparing the chitosan solution.

[0054] (3) Preparation of dandelion extract: The dandelion was dried and crushed to 100 mesh size, and then a 90 vol.% ethanol aqueous solution was added (the ratio of dandelion to ethanol aqueous solution was 1 g:10 mL). The mixture was heated under reflux for 3 h and then filtered. The filtrate was evaporated and concentrated to remove ethanol to obtain the dandelion extract.

[0055] (4) Evenly mix corn stalks, chicken manure, wood ash and composite microorganisms, adjust the moisture content to about 50%, pile and ferment (temperature is 40° C., time is 18 days) to obtain fermented fertilizer.

[0056] (5) The fermented fertilizer and the raw materials other than the microbial granules are mixed evenly and crushed to 100 mesh, and then sprayed with a polyvinyl pyrrolidone solution with a concentration of 5 wt.% for granulation (the granulation temperature is 40°C and the particle size is 3 mm) to obtain fertilizer granules.

[0057] (6) The fertilizer granules and the microbial granules are mixed evenly to obtain a compound fertilizer.

[0058] Example 2

[0059] A compound fertilizer for increasing avocado yield:

[0060] (1) A compound fertilizer for increasing avocado yield, comprising the following raw materials in parts by weight: 40 parts of corn stalks, 20 parts of chicken manure, 12 parts of wood ash, 8 parts of kaolin, 3 parts of potassium citrate, 2 parts of sodium alginate, 1 part of composite microorganisms, 5 parts of microbial granules, 25 parts of urea, 6 parts of potassium chloride, 4 parts of potassium sulfate, 5 parts of fulvic acid, 3 parts of magnesium chloride and 3 parts of dandelion extract.

[0061] The composite microorganism is composed of the following components in parts by mass: 8 parts of actinomycetes, 6 parts of photosynthetic bacteria, 5 parts of Bacillus polymyxa and 8 parts of Bacillus subtilis.

[0062] (2) Preparation method of microbial particles:

[0063] A. Microbial granules are composed of the following raw materials in parts by weight: 3 parts of Bacillus Velezii, 8 parts of Trichoderma harzianum, 2 parts of Pseudomonas aeruginosa, 20 parts of gelatin powder and 30 parts of peanut cake powder.

[0064] B. After the raw materials are evenly mixed, a starch aqueous solution with a concentration of 2 wt.% is sprayed, and low-temperature granulation (temperature is 40° C., and the granulation particle size is 2 mm) is performed to obtain composite particles;

[0065] C. Spray a 2 wt.% starch aqueous solution on the surface of the composite particles, then wrap the activated carbon powder (the average particle size of the activated carbon powder is 10 μm, and the mass ratio of the composite particles to the activated carbon powder is 10:2), dry at low temperature (40°C), spray with a chitosan solution (the ratio of the composite particles to the chitosan solution is 10 g:1.5 mL), and dry at low temperature (40°C) to obtain microbial particles.

[0066] The preparation method of the chitosan solution is as follows: adding chitosan to a glacial acetic acid solution with a concentration of 1 vol.% to make the chitosan concentration be 2 wt.%, heating and stirring to dissolve, and preparing the chitosan solution.

[0067] (3) Preparation of dandelion extract: The dandelion was dried and crushed to 100 mesh, and then an ethanol aqueous solution with a concentration of 80 vol.% (the ratio of dandelion to ethanol aqueous solution was 1 g: 10 mL) was added, and the mixture was heated under reflux for 3 h and then filtered. The filtrate was evaporated and concentrated to remove ethanol to obtain the dandelion extract.

[0068] (4) Evenly mix corn stalks, chicken manure, wood ash and composite microorganisms, adjust the moisture content to about 50%, pile and ferment (temperature is 35° C., time is 15 days) to obtain fermented fertilizer.

[0069] (5) The fermented fertilizer and the raw materials other than the microbial granules are mixed evenly and crushed to 100 mesh, and then sprayed with a polyvinyl pyrrolidone solution with a concentration of 5 wt.% for granulation (the granulation temperature is 40°C and the particle size is 2.5 mm) to obtain fertilizer granules.

[0070] (6) The fertilizer granules and the microbial granules are mixed evenly to obtain a compound fertilizer.

[0071] Example 3

[0072] A compound fertilizer for increasing avocado yield:

[0073] (1) A compound fertilizer for increasing avocado yield, comprising the following raw materials in parts by weight: 30 parts of corn stalks, 25 parts of chicken manure, 15 parts of wood ash, 5 parts of kaolin, 4 parts of potassium citrate, 3 parts of sodium alginate, 2 parts of composite microorganisms, 4 parts of microbial granules, 25 parts of urea, 5 parts of potassium chloride, 5 parts of potassium sulfate, 6 parts of fulvic acid, 3 parts of magnesium chloride and 4 parts of dandelion extract.

[0074] The composite microorganism is composed of the following components in parts by mass: 5 parts of actinomycetes, 5 parts of photosynthetic bacteria, 4 parts of Bacillus polymyxa and 8 parts of Bacillus subtilis.

[0075] (2) Preparation method of microbial particles:

[0076] A. Microbial granules are composed of the following raw materials in parts by weight: 4 parts of Bacillus Velezii, 8 parts of Trichoderma harzianum, 2 parts of Pseudomonas aeruginosa, 30 parts of gelatin powder and 35 parts of peanut cake powder.

[0077] B. After the raw materials are evenly mixed, a starch aqueous solution with a concentration of 2 wt.% is sprayed, and low-temperature granulation (temperature is 40° C., and the granulation particle size is 2 mm) is performed to obtain composite particles;

[0078] C. Spray a 2 wt.% starch aqueous solution on the surface of the composite particles, then wrap the activated carbon powder (the average particle size of the activated carbon powder is 10 μm, and the mass ratio of the composite particles to the activated carbon powder is 10:3), dry at low temperature (40°C), spray with a chitosan solution (the ratio of the composite particles to the chitosan solution is 10 g:2 mL), and dry at low temperature (40°C) to obtain microbial particles.

[0079] The preparation method of the chitosan solution is as follows: adding chitosan to a glacial acetic acid solution with a concentration of 1 vol.% to make the chitosan concentration be 2 wt.%, heating and stirring to dissolve, and preparing the chitosan solution.

[0080] (3) Preparation of dandelion extract: The dandelion was dried and crushed to 100 mesh, and then a 90 vol.% ethanol aqueous solution was added (the ratio of dandelion to ethanol aqueous solution was 1 g: 10 mL). The mixture was heated under reflux for 2 h and then filtered. The filtrate was evaporated and concentrated to remove ethanol to obtain the dandelion extract.

[0081] (4) Evenly mix corn stalks, chicken manure, wood ash and composite microorganisms, adjust the moisture content to about 50%, pile and ferment (temperature is 45° C., time is 20 days) to obtain fermented fertilizer.

[0082] (5) The fermented fertilizer and the raw materials other than the microbial granules are mixed evenly and crushed to 100 mesh, and then sprayed with a polyvinyl pyrrolidone solution with a concentration of 5 wt.% for granulation (the granulation temperature is 40°C and the particle size is 4 mm) to obtain fertilizer granules.

[0083] (6) The fertilizer granules and the microbial granules are mixed evenly to obtain a compound fertilizer.

[0084] Comparative Example 1

[0085] The same as Example 1, except that the Bacillus subtilis in the composite microorganism is replaced by an equal amount of yeast, and the actinomycetes is replaced by an equal amount of Bacillus amyloliquefaciens.

[0086] Comparative Example 2

[0087] The same as Example 1, except that the microbial granules are replaced by a mixed powder consisting of 4 parts of Bacillus Velezii, 6 parts of Trichoderma harzianum, 3 parts of Pseudomonas aeruginosa, 25 parts of gelatin powder and 40 parts of peanut cake powder.

[0088] Comparative Example 3

[0089] The same as Example 1, except that the Pseudomonas aeruginosa in the microbial particles is replaced with an equal mass of Bacillus subtilis.

[0090] Comparative Example 4

[0091] The same as Example 1, except that the compound fertilizer does not contain fulvic acid and magnesium chloride.

[0092] Comparative Example 5

[0093] Same as Example 1, except that the compound fertilizer does not contain dandelion extract.

[0094] Comparative Example 6

[0095] The same as Example 1, except that the operation of step (5) is not performed, and the fermented fertilizer and other raw materials are mixed evenly to obtain compound fertilizer.

[0096] Effect Example 1

[0097] Experimental Group:

[0098] (1) The experiment was conducted in an orchard where avocado seedlings were planted for 8 years and root rot occurred in the previous year. The variety of avocado was Hass and the planting spacing was 5 m × 6 m.

[0099] (2) One month before the avocado trees bloomed, the compound fertilizer prepared in the Examples and Comparative Examples was applied, 1 kg per tree, and 20 trees were applied for each treatment (i.e., each Example or Comparative Example), and the application method was furrow application.

[0100] One month after the avocado trees had withered, the compound fertilizer prepared in the embodiment and the comparative example was applied again, with 0.5 kg applied per tree.

[0101] Two months after the avocado trees had withered, the compound fertilizer prepared in the embodiments and comparative examples was applied again, with 0.5 kg applied per tree.

[0102] (3) During this period, no pesticides were applied to prevent and treat root rot, and conventional field management was carried out.

[0103] (4) The number of avocado trees infected with root rot was investigated one month before the avocados matured, and the avocado yield was measured after the avocados matured.

[0104] When the leaves at the top of the tree crown begin to wilt and droop, or even fall off and dry up, it is determined that root rot has occurred.

[0105] Control group:

[0106] (1) The experiment was conducted in an orchard where avocado seedlings were planted for 8 years and root rot occurred in the previous year. The variety of avocado was Hass and the planting spacing was 5 m × 6 m.

[0107] (2) Apply nitrogen, phosphorus and potassium compound fertilizer (15-15-15) one month before the avocado trees bloom, applying 0.5 kg per plant, and applying for 20 trees in the furrow application method.

[0108] One month after the avocado trees have bloomed, apply nitrogen, phosphorus and potassium compound fertilizer (15-15-15) again, applying 0.25 kg per plant.

[0109] Two months after the avocado trees have bloomed, apply nitrogen, phosphorus and potassium compound fertilizer (15-15-15) again, applying 0.25 kg per plant.

[0110] (3) In the early stage of root rot, 300 times diluted 50% aluminum phosphite was used for root irrigation. 1000 mL was applied to each plant, once every 7 days, for a total of 2 times. Routine field management was also performed.

[0111] (4) The number of avocado trees infected with root rot was investigated one month before the avocados matured, and the avocado yield was measured after the avocados matured.

[0112] When the leaves at the top of the tree crown begin to wilt and droop, or even fall off and dry up, it is determined that root rot has occurred.

[0113] Incidence rate (%) = number of plants infected with root rot / total number of plants (20 plants) × 100%.

[0114] Table 1 Root rot incidence

[0115]

[0116]

[0117] Table 2 Avocado production

[0118] Grouping Average yield per plant (catties) Example 1 85.3 Example 2 81.2 Example 3 84.1 Comparative Example 1 78.5 Comparative Example 2 71.6 Comparative Example 3 78.1 Comparative Example 4 75.0 Comparative Example 5 72.1 Comparative Example 6 67.4 Control group 61.2

[0119] It can be seen from Table 1 and Table 2 that the application of the compound fertilizer prepared in the embodiment of the present invention can reduce the incidence of avocado root rot to 5-10%, and can significantly increase the yield of avocado.

[0120] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A compound fertilizer for increasing avocado yield, characterized in that: The invention comprises the following raw materials in parts by weight: 30-40 parts of corn stalks, 20-25 parts of chicken manure, 10-15 parts of wood ash, 5-8 parts of kaolin, 3-4 parts of potassium citrate, 2-3 parts of sodium alginate, 1-2 parts of composite microorganisms, 4-6 parts of microbial granules, 20-25 parts of urea, 3-6 parts of potassium chloride, 4-5 parts of potassium sulfate, 5-8 parts of fulvic acid, 2-3 parts of magnesium chloride and 3-4 parts of dandelion extract.

2. The compound fertilizer according to claim 1, characterized in that The composite microorganism comprises the following components in parts by weight: 5 to 8 parts of actinomycetes, 4 to 6 parts of photosynthetic bacteria, 4 to 5 parts of Paenibacillus polymyxa and 8 to 10 parts of Bacillus subtilis.

3. The compound fertilizer according to claim 1, characterized in that The microbial granules include the following raw materials in parts by weight: 3-4 parts of Bacillus Velezii, 6-8 parts of Trichoderma harzianum, 2-3 parts of Pseudomonas aeruginosa, 20-30 parts of gelatin powder and 30-40 parts of peanut cake powder.

4. The compound fertilizer according to claim 3, characterized in that The method for preparing the microbial particles comprises the following steps: The raw materials are mixed evenly and then sprayed with starch solution, and composite particles are obtained after low-temperature granulation; The starch solution is sprayed on the surface of the composite particles and the activated carbon powder is wrapped, and then the chitosan solution is sprayed, and the microbial particles are obtained after low-temperature drying.

5. The compound fertilizer according to claim 4, characterized in that The mass ratio of the composite particles to the activated carbon powder is 10:(2-3); The usage ratio of the composite particles to the chitosan solution is 10g:1.5-2.5mL.

6. The compound fertilizer according to claim 1, characterized in that The preparation method of the dandelion extract comprises the following steps: The dandelion is crushed, and then an ethanol solution is added, and the mixture is heated under reflux for extraction and then filtered, and the filtrate is evaporated and concentrated to obtain the dandelion extract.

7. The compound fertilizer according to claim 6, characterized in that The concentration of the ethanol solution is 80-90 vol. %; the heating reflux extraction time is 2-3 hours.

8. A method for preparing the compound fertilizer according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) mixing corn stalks, chicken manure, wood ash and composite microorganisms uniformly and then piling and fermenting to obtain fermented fertilizer; (2) mixing the fermented fertilizer and raw materials other than the microbial granules uniformly, crushing and granulating the mixture to obtain fertilizer granules; (3) The fertilizer particles and the microorganism particles are mixed evenly to obtain the compound fertilizer.

9. The preparation method according to claim 8, characterized in that: The temperature of the pile fermentation is 35-45°C and the time is 15-20 days; The particle size of the granulation is 2 to 4 mm.

10. Use of the compound fertilizer according to any one of claims 1 to 7 in increasing avocado yield.

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