Special organic liquid insect repellent fertilizer for tropical fruits and vegetables as well as preparation method and application of special organic liquid insect repellent fertilizer

Abstract

The invention discloses a special organic liquid insect-repelling fertilizer for tropical fruits and vegetables as well as a preparation method and application thereof. The special organic liquid insect-repelling fertilizer comprises a compound probiotic agent formed by mixing melia azedarach oil, bacillus natto, lactic acid bacteria and saccharomycetes, dishwashing liquid and sterile water. According to the preparation method of the liquid insect-repelling fertilizer, the proportion of the components is adjusted according to tropical climate and insect pest characteristics, the minerals are acidified through acidic substances secreted by the compound probiotic flora, and are matched with the insect-repelling mechanism of the melia azedarach oil and the dishwashing liquid, so that the liquid insect-repelling fertilizer can be easily absorbed by plants, and the insect-repelling effect is good. The effects of improving the disease resistance and killing or inhibiting common germs and insect pests of fruits and vegetables are obvious; the cost is low, pesticide residues can be reduced, and human health and ecological environment protection are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of agriculture, and in particular to an organic liquid insect repellent fertilizer special for tropical fruits and vegetables, and a preparation method and application thereof. Background Art

[0002] Hainan Island, located on the northern edge of the tropics, enjoys a tropical monsoon climate, characterized by year-round hot temperatures and abundant rainfall, with distinct rainy and dry seasons. Spring arrives early, temperatures rise rapidly, diurnal temperature swings are large, and there's no frost year-round, making it a prime base for off-season vegetable cultivation. Rice can be harvested three times a year, and vegetables are available year-round. Hainan Island is also an ideal base for seed breeding in China.

[0003] The perennially warm and humid climate makes tropical fruits and vegetables more susceptible to pests and diseases than those found in other regions. Common tropical fruits and vegetables in Hainan include mangoes, passion fruit, bananas, dragon fruit, chili peppers, loofahs, cowpeas, and bitter melons. Common pests on these tropical fruits and vegetables include aphids, thrips, snails, beetles, scarabs, leaf rollers, coffee leopard borers, scale insects, weevils, stink bugs, mites, fruit flies, termites, black spiny whiteflies, wax mealybugs, and caterpillar moths. Common pathogens include brown rot, stem base rot, anthracnose, downy mildew, viruses, gray mold, powdery mildew, banana bunchy top, wilt, stem spot, and sooty mold.

[0004] Some pests infect crops extensively. For example, thrips are found in all mango-producing areas and have become one of the most significant pest threats to industrial mango cultivation, severely impacting quality and yield, and reducing farmers' returns. Another example is cowpeas in Hainan Province, which are primarily cultivated in open fields. Pests and diseases are particularly rampant, with leafminers and thrips being particularly prevalent. These pests reproduce rapidly, and if control measures are not timely or effective, widespread outbreaks can occur. Furthermore, the scattered distribution of growers makes unified pest control difficult, and overlooked areas often lead to widespread damage. Therefore, frequent application of insecticides and pesticides is unavoidable throughout the growing cycle of tropical fruits and vegetables. This is not only environmentally detrimental, but pesticide residues can also harm human health.

[0005] Although the use of chemical pesticides is only a little over 60 years old, the rate of insect resistance has been increasing rapidly with the continuous replacement of insecticides. The time it takes for insect resistance to develop has been shortened to 3-5 years, leading to increasing control costs. Insecticides, particularly microorganisms, have adapted to insect defense systems through their long-term coexistence with insects, relying on them for survival. It can be said that insect immunity to some pathogens has remained at a very low level for hundreds or even thousands of years.

[0006] Compared to chemical pesticides, biopesticides offer advantages for pest control, such as being less likely to develop resistance, being safe and harmless to non-target organisms such as humans and livestock, and possessing strong selectivity, generally being harmless to vertebrates. However, these characteristics also make biopesticides safe against natural enemies, particularly specialized pathogens that spread rapidly among insect populations. Their insecticide range is particularly narrow, sometimes even limited to a single species or a few types of insects, hindering their widespread application.

[0007] The prior art discloses a green and environmentally friendly insecticide (publication number CN104206453A), which includes a bitter bean extract, neem oil, tea saponin, sophora flavescens, calamine, onion, cinnamon oil, xanthan gum, magnesium aluminum silicate, rapeseed sterol, ephedra, dandelion, mugwort, angelica dahurica, and geranium. While this invention achieves green and environmentally friendly insecticide control and, to a certain extent, addresses the problem of low pesticide residues, the formula is complex, the production cost is high, the scope of application is narrow, and the effectiveness is limited. The prior art also discloses another bio-organic fertilizer specifically for chili peppers, its preparation method, and its use (publication number CN110590444A), which includes organic matter, phosphogypsum, livestock and poultry manure, wood ash, fish pond sludge, biogas residue, chili pepper straw, edible mushroom residue, compound fertilizer, traditional Chinese medicine residue, and a composite microbial agent. This bio-organic fertilizer can provide nutrients for crops to promote crop growth, and can also improve the ability of crops to resist pests and diseases, and can improve soil permeability and promote crop root respiration; in the raw materials, add materials with bactericidal and disinfecting effects such as wood ash and Chinese medicinal residues. After the fertilizer is applied to the soil, it can kill the insect pests at the roots of crops, promote pepper yield and improve quality. However, the raw materials such as ginseng, pilose antler, Chuanwu, and Ganoderma lucidum in the Chinese medicinal residues used in this invention are expensive and difficult to distinguish and obtain in the medicinal residues. The production cost is high and difficult to mass produce, and the role of the composite microbial agent in this invention is to degrade the fermented raw materials, which not only further increases the cost, but also causes a waste of resources to a great extent. In addition, the above two inventions also have the common disadvantages of not being applied in a convenient manner and not being able to be flexibly applied according to the insect pests faced by crops in different seasons.

[0008] So far, there is no organic liquid insect repellent fertilizer for tropical fruits and vegetables that can be flexibly used according to different climatic conditions and two-way adjust the different needs of insect repellent and fertilization according to the specific conditions of crops. This not only achieves good agricultural effects such as activating the soil, promoting plant absorption, and repelling insects, but also has the practical value of saving costs and protecting the ecological environment. Summary of the Invention

[0009] The present invention provides a tropical fruit and vegetable organic liquid insect repellent fertilizer and its preparation method and application to solve the above-mentioned technical problems. It comprises neem oil, detergent and a composite bacterial agent composed of three probiotics: Bacillus natto, lactic acid bacteria and yeast. The above-mentioned composition contains nitrogen, phosphorus, potassium, calcium, magnesium and boron elements required for the growth of fruits and vegetables, and the obtained liquid organic fertilizer is comprehensive in nutrition and has the nutrients required in the growth process of fruits and vegetables, ensuring that fruits and vegetables will not have nutrient deficiency problems. The present invention belongs to organic fertilizer, can improve soil fertilization and soil, avoids the problem of single inorganic fertilizer nutrients and the need to rely on compounding to balance fertilization, and can improve the soil environment, promote the biological transformation process in the soil, and is conducive to the continuous improvement of soil fertility. In addition, the microorganisms contained in the fertilizer can promote the absorption and utilization of fertilizer by fruits and vegetables, promote the growth and development of fruits and vegetables, and then improve the yield and quality of fruits and vegetables.

[0010] To achieve the above objectives, the present invention provides the following technical solutions:

[0011] The invention discloses an organic liquid insect repellent fertilizer specially used for tropical fruits and vegetables, comprising the following raw materials in parts by weight: 10 to 50 parts of neem oil, 5 to 50 parts of compound probiotics, 10 to 50 parts of dishwashing liquid, and the balance of water; the compound probiotics are a mixture of Bacillus natto, lactic acid bacteria, and yeast; and the water is sterile water sterilized by ozone.

[0012] Preferably, the raw materials are included in the following parts by weight: 10 to 30 parts of neem oil, 10 to 50 parts of compound probiotics, 10 to 30 parts of detergent, and the balance of sterile water.

[0013] Preferably, the preparation comprises the following raw materials in parts by weight: 10-20 parts of neem oil, 30-50 parts of compound probiotics, 10-20 parts of dishwashing liquid, and the balance of sterile water.

[0014] Preferably, the preparation comprises the following raw materials in parts by weight: 10 parts of neem oil, 5 parts of compound probiotics, 10 parts of detergent, and the balance of sterile water; or 10 parts of neem oil, 15 parts of compound probiotics, 10 parts of detergent, and the balance of sterile water.

[0015] Preferably, the preparation comprises the following raw materials in parts by weight: 20 parts of neem oil, 15 parts of compound probiotics, 20 parts of detergent, and the balance of sterile water; or 20 parts of neem oil, 25 parts of compound probiotics, 20 parts of detergent, and the balance of sterile water.

[0016] Preferably, the number of viable bacteria in the composite probiotics is not less than 10 9 CFU / g; the mass ratio of Bacillus natto, lactic acid bacteria and yeast in the composite probiotics is 5-9:2-5:2-4.

[0017] Preferably, the mass ratio of Bacillus natto, lactic acid bacteria and yeast in the composite probiotics is 6:4:3 or 5:2:2.

[0018] Another object of the present invention is to provide a method for preparing an organic liquid insect repellent fertilizer for tropical fruits and vegetables, comprising the following steps:

[0019] (1) Neem oil and detergent are adjusted according to a ratio to obtain a mixture I;

[0020] (2) Mix Bacillus natto, lactic acid bacteria, and yeast according to the ratio, and dilute with 300-1000 times sterile water to obtain mixture II;

[0021] (3) Adding mixture I to mixture II and fermenting at 40°C to 80°C for 20 to 40 hours to obtain mixture III;

[0022] (4) When using, a mixture of Bacillus natto, lactic acid bacteria and yeast is added to the mixture III, with the mass ratio of the mixture III to Bacillus natto, lactic acid bacteria and yeast being 1:2-3, to obtain a mixture IV;

[0023] (5) When using, neem oil is added to mixture III, and the mass ratio of mixture III to neem oil is 1:2-3 to obtain mixture V.

[0024] Another object of the present invention is to provide an organic liquid insect repellent fertilizer specially used for tropical fruits and vegetables for use in tropical fruit and vegetable planting.

[0025] The application of the organic liquid insect repellent fertilizer for tropical fruits and vegetables of the present invention comprises the following steps:

[0026] (1) From September to November each year, use mixture IV to adjust the pH value and prevent pests and diseases. Start by diluting mixture IV with 300 times sterile water and irrigate the roots twice a month. Dilute mixture IV with 600 times sterile water and spray it on the leaves twice. Use continuously.

[0027] (2) From November to February of the following year, dilute the mixture V with 500 times of sterile water and irrigate the roots twice a month, and dilute the mixture V with 1000 times of sterile water and spray the leaves twice a month;

[0028] (3) From May to September each year, apply basic insect repellent fertilizer mixture III on the back of young leaves;

[0029] (4) Three days before fruit harvest, dilute mixture III with 500 times sterile water and spray the surface once;

[0030] (5) After emergence, spray the mixture IV with 800-fold sterile water dilution once a week;

[0031] (6) After two weeks, dilute the mixture V with 500 times sterile water and spray it on the leaves once.

[0032] The present invention has the following beneficial effects:

[0033] (1) The preparation of the liquid insect repellent fertilizer of the present application is to adjust the distribution of each group according to the different seasons. By adjusting the ratio of neem oil and compound bacterial agent in a targeted manner, it is applied according to the climatic conditions and insect pest conditions of different seasons in order to achieve the desired effect.

[0034] Take Hainan thrips as an example. Thrips are a common pest encountered by tropical fruits and vegetables at any time of year, especially during the dry season. Even into December, thrips continue to wreak havoc on tropical fruits during their flowering period, resulting in poor pollination and low fruit set. The rainy season, however, suppresses the occurrence and infestation of thrips. From September to mid-November, just before the end of the rainy season, thrips are rare. At this time, Mixture IV, which contains a higher proportion of a complex microbial agent, should be applied. During the dry season, from late November to February, thrips are abundant, overlapping generations, and causing severe damage. During this period, Mixture V, which contains a higher proportion of neem oil, should be applied. From May to September, during the period of new shoot emergence, when heavy rains occur, small numbers of thrips may be found on the undersides of individual young leaves. At this time, a basic insect repellent fertilizer mixture III should be applied. A higher proportion of the complex microbial agent can focus on providing nutrients to fruits and vegetables to promote their growth, while a higher proportion of neem oil can focus on controlling common pathogens and pests of tropical fruits and vegetables.

[0035] (2) This application uses a composite bacterial agent to ferment other raw materials to produce products that can provide nutrients to fruits and vegetables to promote crop growth and improve the disease and pest resistance of fruits and vegetables. In addition, the composite bacterial agent enters the interior of fruits and vegetables, not only providing nutrients to fruits and vegetables that grow well, but also further recovering dead fruits and vegetables.

[0036] (3) The reason why the "composite probiotics" involved in the present invention use three probiotics, namely Natto bacteria, lactic acid bacteria and yeast, is based on the theory of soil microbial ecology. The three strains are cultured in a mixed bacterial system to form a stable structure, which is aerobic and anaerobic. The multi-strain combination technology is adopted to make it have multiple usage properties, universal for farming and breeding, and antibacterial and bacteriostatic. In addition, the strain has ultra-low temperature characteristics and is active at -6°C. The antibacterial (inhibitory) characteristics and advantages of the composite probiotic agent are that it utilizes the strong acid properties of the composite agent to inhibit the reproduction of pathogens with a pH value of 5.0-6.5, and can also utilize the ester volatile substances produced by the bacterial community to achieve the effect of pests not wanting to approach. Spraying the composite agent on the leaves can increase the microorganisms on the leaf surface, make the leaf surface clean, and reduce the invasion of pathogens. The alkaline decomposition enzyme formed by the composite probiotic can also play an antibacterial, bactericidal and insecticidal role.

[0037] (4) The main ingredients of dishwashing liquid are sodium alkyl sulfonate, sodium fatty alcohol ether sulfate, foaming agent, solubilizer, fragrance, water, pigment and preservative. The principle of dishwashing liquid in killing pests is a physical method, such as blocking the insect valve. The present invention combines dishwashing liquid with neem oil, utilizing the strong antimicrobial activity of neem oil, and synergistically mixes to form a natural insecticide that is harmless and non-toxic to humans, animals and birds, and is completely environmentally friendly.

[0038] (5) The liquid insect repellent fertilizer provided by the present invention has simple active ingredients. The acidic substances secreted by the composite probiotic flora acidify the minerals, making them easily absorbed by plants. Excess nitrogen in the plants also promotes digestion and improves disease resistance. At the same time, it can eliminate or inhibit common pathogens and pests on fruits and vegetables. Furthermore, all the material components of the present invention are natural ingredients that have natural degradation pathways in nature and do not pollute the environment.

[0039] (6) The present invention uses sterile water that has been sterilized by ozone, which can prevent plant diseases and prevent the rot of plant roots and stems. DETAILED DESCRIPTION

[0040] The features and advantages of the present invention can be further understood through the following detailed description. The examples provided are merely illustrative of the present invention and are not intended to limit the scope of the present invention in any way. The experimental methods in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified.

[0041] Example 1: An organic liquid insect repellent fertilizer for tropical fruits and vegetables, comprising the following raw materials in parts by weight: 10 parts of neem oil, 5 parts of compound probiotics, 10 parts of dishwashing liquid, and the balance of sterile water;

[0042] Among them, the mass ratio of neem oil and dishwashing liquid is 1:1;

[0043] The compound probiotics include Natto bacteria, lactic acid bacteria and yeast, with a mass ratio of 6:4:3, and the number of viable bacteria is about 6*10 9 CFU / g.

[0044] Compound probiotic dilution solution, dilution ratio is 300 times and 600 times.

[0045] Example 2: An organic liquid insect repellent fertilizer for tropical fruits and vegetables, comprising the following raw materials in parts by weight: 20 parts of neem oil, 15 parts of compound probiotics, 20 parts of dishwashing liquid, and the balance of sterile water;

[0046] Among them, the mass ratio of neem oil and dishwashing liquid is 1:1;

[0047] The compound probiotics include Natto bacteria, lactic acid bacteria and yeast, with a mass ratio of 6:4:3, and the number of viable bacteria is about 6*10 9CFU / g.

[0048] Compound probiotic dilution solution, dilution ratio is 500 times and 1000 times.

[0049] Example 3: An organic liquid insect repellent fertilizer for tropical fruits and vegetables, comprising the following raw materials in parts by weight: 10 parts of neem oil, 15 parts of compound probiotics, 10 parts of dishwashing liquid, and the balance of sterile water;

[0050] Among them, the mass ratio of neem oil and dishwashing liquid is 1:1;

[0051] The compound probiotics include Natto bacteria, lactic acid bacteria and yeast, with a mass ratio of 6:4:3, and the number of viable bacteria is about 6*10 9 CFU / g.

[0052] Compound probiotic dilution solution, dilution ratio is 500 times and 1000 times.

[0053] Example 4: An organic liquid insect repellent fertilizer for tropical fruits and vegetables, comprising the following raw materials in parts by weight: 20 parts of neem oil, 25 parts of compound probiotics, 20 parts of dishwashing liquid, and the balance of sterile water;

[0054] Among them, the mass ratio of neem oil and dishwashing liquid is 1:1;

[0055] The compound probiotics include Natto bacteria, lactic acid bacteria and yeast, with a mass ratio of 5:2:2, and the number of viable bacteria is about 6*10 9 CFU / g.

[0056] Compound probiotic dilution solution, dilution ratio is 500 times and 1000 times.

[0057] The preparation methods of the above-mentioned embodiments 1 to 4 comprise the following steps:

[0058] (1) Neem oil and dishwashing liquid are adjusted in a 1:1 ratio to obtain a mixture I;

[0059] (2) Bacillus natto, lactic acid bacteria, and yeast were mixed in the mass ratios described in the corresponding examples, and then diluted with 300-1000 times sterile water to obtain a mixture II;

[0060] (3) adding mixture I to mixture II and fermenting at 40°C to 80°C for 20 to 40 hours to obtain mixture III;

[0061] (4) adding a mixture of Bacillus natto, lactic acid bacteria, and yeast to mixture III, wherein the mass ratio of mixture III to Bacillus natto, lactic acid bacteria, and yeast is 1:2-3, to obtain mixture IV;

[0062] (5) Neem oil is added to mixture III, with the mass ratio of mixture III to neem oil being 1:2-3, to obtain mixture V.

[0063] From September to November each year, use mixture IV to adjust the pH value and prevent diseases and insect pests. Start by diluting mixture IV with 300 times sterile water for root irrigation twice a month, and dilute mixture IV with 600 times sterile water for foliage spraying twice, and use continuously; from November to February of the following year, dilute mixture V with 500 times sterile water for root irrigation twice a month, and dilute mixture V with 1000 times sterile water for foliage spraying twice a month; from May to September, apply basic insect repellent fertilizer mixture III on the back of young leaves; three days before fruit harvest, dilute mixture III with 500 times sterile water for surface spraying once; after emergence, dilute mixture IV with 800 times sterile water for spraying once a week; two weeks later, dilute mixture V with 500 times sterile water for foliage spraying once.

[0064] Passion fruit spraying experiment

[0065] The organic fertilizers from Examples 1-4 were mixed with common passion fruit pests and pathogens. When the passion fruit germinated, the mixture IV was diluted 300 times with sterile water and used for root irrigation twice. The mixture IV was diluted 600 times with sterile water and used for foliar spraying twice. This was continued for two months. For the third month, the mixture V was diluted 500 times with sterile water and used for root irrigation twice monthly. The mixture V was diluted 1000 times with sterile water and used for foliar spraying twice monthly. The activity and mortality of the pathogens were observed monthly. The results are summarized in Tables 1-3 below: (In Tables 1-3, the number of days D indicates the duration of pest and pathogen mortality; where no time is shown, mortality occurred within one day.)

[0066]

[0067] As can be seen from Table 1, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is ordinary, lasting for 1-3 days, and the growth of passion fruit is good; in Example 3 and Example 4, the growth of passion fruit is good, and the insecticidal effect is not significant enough compared with Example 1 and Example 2.

[0068]

[0069] As can be seen from Table 2, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is improved, but the effect is still general, lasting for 1-4 days, and the growth of passion fruit is good; in Example 3 and Example 4, the growth of passion fruit is faster, and the insecticidal effect is not significant enough relative to that of Example 1 and Example 2.

[0070]

[0071] As can be seen from Table 3, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is very good, lasting up to 9 hours, while the growth of passion fruit is average; in Example 3 and Example 4, the growth of passion fruit is good and the insecticidal effect is also significant.

[0072] As shown in Tables 1-3, in the first two months of the spraying experiment, the insecticide effect of mixture IV with the probiotics was moderate, and the passion fruit grew well. Starting from the third month, the insecticide effect of mixture V with neem oil was very good, and the passion fruit grew well.

[0073] Bitter melon spraying experiment.

[0074] The organic fertilizers of Examples 1 to 4 above were mixed with common bitter melon pests and pathogens. After seedling emergence, the mixture IV was diluted with 800 times sterile water and sprayed once a week. Two weeks later, the mixture V was diluted with 500 times sterile water and sprayed on the leaves once. The activity and mortality of the pathogens were observed monthly. The results are shown in Tables 4-6 below:

[0075]

[0076] As can be seen from Table 4, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is ordinary, lasting for 1-3 days, and the growth of bitter melon is good; in Example 3 and Example 4, the growth of bitter melon is good, and the insecticidal effect is not significant enough compared with Example 1 and Example 2.

[0077]

[0078] As can be seen from Table 5, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is improved, but the effect is still general, lasting for 1-4 days, and the growth of bitter melon is good; in Example 3 and Example 4, the growth of bitter melon is faster, and the insecticidal effect is not significant enough compared with Example 1 and Example 2.

[0079]

[0080] As can be seen from Table 6, in Example 1 and Example 2, the insecticidal effect of the liquid fertilizer is very good, lasting up to 9 hours, while the growth of bitter melon is average; in Example 3 and Example 4, the growth of bitter melon is good and the insecticidal effect is significant.

[0081] As shown in Tables 4-6, in the first two months of the spraying experiment, the insecticide effect of mixture IV with the probiotics was average, and the bitter melons grew well. Starting from the third month, the insecticide effect of mixture V with neem oil was very good, and the bitter melons grew well.

[0082] Pesticide residue experiments.

[0083] The liquid fertilizers of Examples 1 to 4 were sprayed on the leaves of fruits and vegetables. One hour later, other pesticides were sprayed on the leaves to observe the residues of other pesticides. The observation results are shown in Table 7 below:

[0084]

[0085]

[0086] As can be seen in Table 7, the formulation of the present invention, when applied directly to samples that had been sprayed with other pesticides, showed a certain degradation effect on some pesticides, such as thiamethoxam, pyrimethanil, imidacloprid, and propamocarb. Furthermore, no pesticide residues were detected in one bitter melon and one cowpea sample treated with the formulation during the planting process.

[0087] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An organic liquid insect repellent fertilizer for tropical fruits and vegetables, characterized in that: The invention comprises the following raw materials in parts by weight: 10-50 parts of neem oil, 5-50 parts of compound probiotics, 10-50 parts of detergent, and the balance of water; the compound probiotics are a mixture of Bacillus natto, lactic acid bacteria and yeast; and the water is sterile water sterilized by ozone.

2. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 1, characterized in that: The preparation comprises the following raw materials in parts by weight: 10 to 30 parts of neem oil, 10 to 50 parts of compound probiotics, 10 to 30 parts of detergent, and the balance of sterile water.

3. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 2, characterized in that The preparation comprises the following raw materials in parts by weight: 10-20 parts of neem oil, 30-50 parts of compound probiotics, 10-20 parts of detergent, and the balance of sterile water.

4. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 3, characterized in that The preparation comprises the following raw materials in parts by weight: 10 parts of neem oil, 5 parts of compound probiotics, 10 parts of detergent, and the balance of sterile water or 10 parts of neem oil, 15 parts of compound probiotics, 10 parts of detergent, and the balance of sterile water.

5. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 3, characterized in that: The preparation comprises the following raw materials in parts by weight: 20 parts of neem oil, 15 parts of compound probiotics, 20 parts of detergent, and the balance of sterile water or 20 parts of neem oil, 25 parts of compound probiotics, 20 parts of detergent, and the balance of sterile water.

6. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to any one of claims 1 to 5, characterized in that The number of viable bacteria in the composite probiotics is not less than 10 9 CFU / g; the mass ratio of Bacillus natto, lactic acid bacteria and yeast in the composite probiotics is 5-9:2-5:2-4.

7. The organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 6, characterized in that: The mass ratio of Bacillus natto, lactic acid bacteria and yeast in the composite probiotics is 6:4:3 or 5:2:

2.

8. A method for preparing an organic liquid insect repellent fertilizer for tropical fruits and vegetables, characterized in that: The following steps are involved: (1) Neem oil and dishwashing liquid are adjusted in a mass ratio of 1:1 to obtain a mixture I; (2) Mix Bacillus natto, lactic acid bacteria, and yeast according to the ratio, and dilute with 300-1000 times sterile water to obtain mixture II; (3) Adding mixture I to mixture II and fermenting at 40°C to 80°C for 20 to 40 hours to obtain mixture III; (4) When using, a mixture of Bacillus natto, lactic acid bacteria and yeast is added to the mixture III, with the mass ratio of the mixture III to Bacillus natto, lactic acid bacteria and yeast being 1:2-3, to obtain a mixture IV; (5) When using, neem oil is added to mixture III, and the mass ratio of mixture III to neem oil is 1:2-3 to obtain mixture V.

9. Use of the organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 8 in tropical fruit and vegetable planting.

10. The use of the organic liquid insect repellent fertilizer for tropical fruits and vegetables according to claim 9, characterized in that The following steps are involved: (1) From September to November each year, use mixture IV to adjust the pH value and prevent pests and diseases. Start by diluting mixture IV with 300 times sterile water and irrigate the roots twice a month. Dilute mixture IV with 600 times sterile water and spray it on the leaves twice. Use continuously. (2) From November to February of the following year, dilute the mixture V with 500 times of sterile water and irrigate the roots twice a month, and dilute the mixture V with 1000 times of sterile water and spray the leaves twice a month; (3) From May to September each year, apply basic insect repellent fertilizer mixture III on the back of young leaves; (4) Three days before fruit harvest, dilute mixture III with 500 times sterile water and spray the surface once; (5) After emergence, spray the mixture IV with 800-fold sterile water dilution once a week; (6) After two weeks, dilute the mixture V with 500 times sterile water and spray it on the leaves once.

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