Mixed fertilizer for improving soil activity and preparation method thereof

Abstract

The invention discloses a mixed fertilizer for improving soil activity and a preparation method. The mixed fertilizer is prepared from the following raw materials in parts by weight: 20-50 parts of modified zeolite, 1-5 parts of a polyurethane synergist, 0.5-1.0 part of a cross-linking agent, 10-20 parts of a composite leavening agent, 5-10 parts of a surfactant, 20-30 parts of carbon nanotube powder, 50-80 parts of a nitrogen-phosphorus-potassium fertilizer, 15-30 parts of a biological organic fertilizer, 30-50 parts of amino acid powder, 25-35 parts of humic acid, 5-15 parts of urea and a proper amount of compound bacteria. S1, preparing a zeolite-based carrier; s2, preparing a fertilizer base material; and S3, mixing. Compared with the prior art, the method has the advantages that the surface and internal activity of the zeolite can be improved; the effect of promoting the formation of a soil aggregate structure is very good; the metabolism of microorganisms is facilitated, and the growth and reproduction of the microorganisms are facilitated, so that the development of crop root systems is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of soil fertilizer, and in particular to a mixed fertilizer for improving soil activity and a preparation method thereof. Background Art

[0002] Soil activity refers to the comprehensive ability of the soil to contain a large number of microorganisms and rich nutrients, that is, the ability of the soil to biochemically dissolve and convert the minerals absorbed by plant roots into effective nutrients. In other words, the microbial activity is vigorous and the effective nutrients of organic matter decomposition are high. The standard for judging soil activity is that there are more than 10,000 biologically active (including microorganisms, protozoa and fungi) per cubic centimeter of soil, which is generally called active soil; less than 10,000 / cm 3 It is called low-activity soil. Usually, active soil contains a relatively comprehensive amount and proportion of minerals, organic matter, nitrogen, phosphorus and potassium. If any of these nutrients is excessive, the soil will become compacted, and even lead to crop yield reduction and soil degradation. Although chemical fertilizers can increase the yield of crops, long-term and large-scale use of chemical fertilizers will make it impossible to maintain and restore many fertility. Some chemical fertilizers can also cause problems such as soil compaction and acidification. After several years of continuous planting of crops such as vegetables, fruits and cotton, some diseases will become more and more serious, and the amount of fertilizer applied will also increase. The more chemical fertilizers are used, the more compacted the soil will be. The more compacted the soil is, the poorer it is. The number of microorganisms such as Bacillus subtilis, potassium-solubilizing lichens, Bacillus megaterium, and Bacillus gelatinous will be less. The soil is rich in a large number of microorganisms and nutrients, which is an important indicator of soil activity.

[0003] Carbon tubes have good electron and heat conduction capabilities. When connected to metal, they can greatly improve the signal transmission effect and heat dissipation effect. Carbon tubes themselves can be used as soil conditioners and do not carry nutrients. Carbon fibers are also made of carbon elements and have good electrical conductivity. By wrapping the wires in the nano-carbon tube powder wrapped outside the carbon tubes, the carbon fibers can be connected through the carbon tubes, and the thermal conductivity of the carbon tubes can be used to increase the high-temperature sterilization effect in the soil.

[0004] In the prior art, carbon tubes are mixed with various active organic matter to produce organic carbon fiber fertilizers, but mixing carbon tubes with chemical fertilizers is not possible. Due to the characteristics of carbon tubes, it is difficult to crush them after mixing, and the fertilizer particles cannot be evenly adsorbed on the carbon tubes, making it difficult to ensure the effectiveness of the carbon tubes in actual application. How to mix nano carbon tube powder with nitrogen, phosphorus, potassium fertilizers and other nutrients in a certain proportion to produce a mixed fertilizer containing carbon tubes and organic matter will greatly improve soil activity and improve the taste of fruits. This is a problem that needs to be solved urgently. Therefore, a mixed fertilizer for improving soil activity and a preparation method are proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects and provide a mixed fertilizer for improving soil activity and a preparation method thereof.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a mixed fertilizer for improving soil activity, comprising the following raw materials in parts by weight:

[0007] 20-50 parts of modified zeolite, 1-5 parts of polyurethane enhancer, 0.5-1.0 parts of cross-linking agent, 10-20 parts of composite fermentation agent, 5-10 parts of surfactant, 20-30 parts of carbon nanotube powder, 50-80 parts of nitrogen, phosphorus and potassium fertilizers, 15-30 parts of biological organic fertilizer, 30-50 parts of amino acid powder, 25-35 parts of humic acid, 5-15 parts of urea and appropriate amount of composite bacteria.

[0008] Furthermore, the preparation method of the modified zeolite is:

[0009] Putting zeolite and activator into a heating furnace in a ratio of 100:8-15, heating to 80-90°C, heating time is 45-55min, stirring while heating, then introducing 2-5% hydrogen chloride gas into the heating furnace, after the zeolite reacts with hydrogen chloride gas for 1-2h, stopping adding hydrogen chloride gas, and adding modifier and modified catalyst liquid, the ratio of modified catalyst to modifier is 2:1-2.5, the mass ratio of modified catalyst and modifier mixture to zeolite is 1:8-15, continuing heating, after the reaction in the reactor is completed, taking out zeolite, and then putting it into the reactor, injecting 40-50% sodium hydroxide solution into the reactor to adjust the pH value to 10, heating to 100-150°C, and keeping for 40-48h to obtain hollow zeolite fiber;

[0010] The hollow zeolite fiber and sodium chloride are mixed in a mass ratio of 1:8-10 at a temperature of 50-80°C, stirred for 1-2 hours, cooled, washed with clean water, filtered and dried to obtain a modified zeolite.

[0011] Furthermore, the polyurethane synergist is an alkyl polyetheramine or a modified polyetheramine, and the cross-linking agent is tea saponin or disodium sulfosuccinyl monoester.

[0012] Furthermore, the composite fermentation agent is a microbial preparation, which comprises, by mass, 10 to 25 parts of Bacillus cereus, 9 to 20 parts of Rhodopseudomonas palustris, 8 to 21 parts of Pseudomonas buchneri and 6 to 14 parts of Saccharomyces cerevisiae.

[0013] Furthermore, the surfactant is one or more of dodecyl dimethyl betaine, polyoxyethylene fatty acid ester, and condensate of dodecylphenol and ethylene oxide.

[0014] Furthermore, the nitrogen, phosphorus and potassium fertilizer is obtained by mixing urea, superphosphate and potassium chloride, and the mass ratio of the urea, superphosphate and potassium chloride is 10:5:3.

[0015] Furthermore, the bio-organic fertilizer is mainly composed of plant straw, which is mixed with livestock and poultry manure and obtained through composting.

[0016] Furthermore, the composite bacteria is composed of Bacillus cereus, Rhodopseudomonas palustris, Pseudomonas buchneri and Saccharomyces cerevisiae in a mass ratio of (2-4):(2-4):(1-2):(1-3).

[0017] The present invention also provides a method for preparing a mixed fertilizer for improving soil activity, comprising the following steps:

[0018] S1. The modified zeolite and the composite fermentation agent are mixed evenly and placed in a reactor, and a polyurethane synergist, a crosslinking agent and a surfactant are added to the reactor, and then the carbon nanotube powder is added and stirred for 45 to 55 minutes to obtain a mixture, and finally the composite bacteria are added to the mixture and stirred for 25 to 75 minutes to obtain a zeolite-based carrier;

[0019] S2. Add biological organic fertilizer and amino acid powder to clean water, heat to 120-130°C while stirring to obtain a solution, mix urea and humic acid in the solution at a mass ratio of 1:3, add nitrogen, phosphorus and potassium fertilizers to the solution, stir for 6-8h, and obtain a fertilizer base;

[0020] S3. Add the fertilizer base material to the zeolite-based carrier, stir for 30 to 35 minutes to obtain a mixture, heat the mixture to 115 to 120° C., and ferment at a constant temperature for 55 to 65 hours, and then cool to obtain the mixture.

[0021] Furthermore, in S1, the composite bacteria is added to the mixture, and stirring is continued for 50 to 60 minutes.

[0022] The advantages of the present invention compared with the prior art are:

[0023] (1) The modified zeolite used in the present invention is obtained by modifying the activated zeolite. The activated zeolite has a larger pore volume and specific surface area. The polyurethane synergist and the cross-linking agent can improve the mechanical strength of the product. The addition of the polyurethane synergist and the cross-linking agent can reduce the water absorption coefficient of the zeolite and improve the adsorption performance of the zeolite. The addition of the surfactant can improve the dispersibility and permeability of the product, improve the uniformity of the product, and help to improve the activity of the surface and interior of the zeolite.

[0024] (2) The present invention uses a composite fermentation agent, which can effectively decompose organic matter, promote the decomposition of organic matter, and accelerate the absorption of nitrogen, phosphorus and potassium. During the microbial fermentation process, the metabolism and microecological effects of the microorganisms themselves have a good effect on the formation of soil aggregate structure. Through the interaction between the cross-linking agent and the zeolite, the inner and outer walls of the zeolite are connected, which plays a reinforcing role, thereby increasing the size of the zeolite, increasing the specific gravity of the zeolite, and preventing part of the zeolite from being lost from the soil. In addition, the zeolite has a larger pore structure, which is conducive to the metabolism of microorganisms.

[0025] (3) The present invention uses carbon nanotube powder, which can improve the mechanical strength of the product, increase the air permeability and water permeability of the soil, and is conducive to the growth and reproduction of microorganisms in the soil, while enhancing photosynthesis. Nitrogen, phosphorus and potassium fertilizers and bio-organic fertilizers are both solids, and carbon nanotube powder is conducive to the full mixing of nitrogen, phosphorus and potassium fertilizers, bio-organic fertilizers and zeolite, avoiding excessive local nutrients and affecting the absorption of crops. The bio-organic fertilizer used in the present invention is formed by the full contact and decomposition of microbial preparations with plant straws and livestock and poultry excrement, and the present invention adds microbial preparations, which can accelerate the decomposition rate of organic fertilizers and promote the metabolism of microorganisms, while plant straws and livestock and poultry excrement can provide enough nutrition for microorganisms, which is conducive to the growth and reproduction of microorganisms, thereby promoting the development of crop root systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic flow chart of a method for preparing a mixed fertilizer for improving soil activity. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0028] The invention is used for improving soil activity, changing soil compaction and providing fertilizer, and is prepared by mixing a plurality of components, including modified zeolite, polyurethane synergist and the like.

[0029] The modified zeolite is prepared by the following method: adding 8-18% sodium hydroxide by mass, stirring thoroughly at room temperature, and filtering deionized water; then drying for 24 hours, calcining at 600°C for 4 hours, and then placing in acetone for ultrasonic treatment for 12 minutes, and drying in a vacuum drying oven to obtain the modified zeolite.

[0030] The polyurethane synergist is obtained by the following preparation method: calculated by mass percentage, 15% of diethylenetriamine, 13% of acrylic acid, 5% of benzoyl peroxide, 8% of ethylene glycol, 6% of toluene, and 25% of emulsifier are mixed evenly, and reacted at 65° C. for 6 hours to obtain the polyurethane synergist.

[0031] The cross-linking agent is epichlorohydrin, the composite fermentation agent is obtained by mixed fermentation of white rot mold, solanacearum rickettsius, actinomycetes, bacillus cereus and the like, and the surfactant is alkaneamide salt.

[0032] The mixed fertilizer is composed of the following raw materials in parts by weight: 20 to 50 parts of modified zeolite, 1 to 5 parts of polyurethane synergist, 0.5 to 1.0 parts of crosslinking agent, 10 to 20 parts of composite fermentation agent, 5 to 10 parts of surfactant, 20 to 30 parts of nano carbon tube powder, 50 to 80 parts of nitrogen, phosphorus and potassium fertilizers, 15 to 30 parts of biological organic fertilizers, 30 to 50 parts of amino acid powder, 25 to 35 parts of humic acid, 5 to 15 parts of urea and a proper amount of composite bacteria.

[0033] The composite bacteria include actinomycetes, soil bacillus, bacillus subtilis and photosynthetic bacteria, and the weight ratio thereof is 3:2:1:2;

[0034] Nitrogen, phosphorus and potassium fertilizer is a mixture of urea, monoammonium phosphate and potassium chloride in a weight ratio of 3:2:1.

[0035] It is prepared according to the following preparation method, comprising the following steps:

[0036] The first step is to grind the modified zeolite powder into micron size, add the polyurethane synergist and stir. The stirring process is carried out under the condition of ultrasonic vibration. The ultrasonic frequency is 20-50 MHz, the temperature is 40-60°C, and the stirring time is 20min-2h.

[0037] Step 2: Evenly mix the composite fermentation agent, carbon nanotube powder, surfactant and cross-linking agent, then add the mixture obtained in the first step, stir evenly, and let stand for 3 to 5 hours;

[0038] The third step is to heat the bio-organic fertilizer, humic acid, nitrogen, phosphorus and potassium fertilizers and urea to 50° C., mix them evenly with the materials obtained in the second step, then spray the composite bacteria, adjust the water content to 25-30%, and granulate to obtain a mixed fertilizer.

[0039] In the first step, the modified zeolite is ground to micron level, and a polyurethane enhancer is added for stirring. The stirring process is carried out under ultrasonic vibration conditions. The ultrasonic frequency is 20-50 MHz, the temperature is 40-60°C, and the stirring time is 20min-2h. The zeolite and the polyurethane enhancer are evenly mixed by ultrasonic vibration. The zeolite has multiple pores. The addition of the polyurethane enhancer can form micropores, which further promotes the porosity of the zeolite structure. The polyurethane enhancer has soft chains, which match the pores in the zeolite. Under vibration and temperature conditions, the soft chains quickly adhere to the zeolite to prevent local enrichment. The composite leavening agent, nanocarbon tube powder, surfactant and cross-linking agent are evenly mixed, and then the mixture obtained in the first step is added. The surfactant can combine the nanocarbon tubes in the nanocarbon tube powder with the zeolite surface, so that the surface structure of the carbon tubes and zeolite can be contact with each other, so that the carbon tube and the zeolite are organically combined, and then a cross-linking agent is used to cross-link and solidify the bonding structure of the carbon tube and the surface of the zeolite, so that the bonding between the nano carbon tube and the zeolite is more firmly. Take biological organic fertilizer, humic acid, nitrogen, phosphorus and potassium fertilizer and urea and heat them to 50° C., and mix them evenly with the materials obtained in the second step. The composite bacteria can play a good effect of decomposing organic matter, so that the organic matter can be fully decomposed at room temperature, and then the composite bacteria are sprayed, and the water content is adjusted to 25-30%, and granulation is performed to form fertilizer. Under the action of the composite bacteria, the organic matter in the organic matter can be fully decomposed to avoid local excess of organic matter. At the same time, through the gradual mixing of the first step, the second step and the third step, the raw materials can be mixed evenly to ensure that the raw materials will not agglomerate in the raw materials, and the raw materials can be fully integrated. Various organic matters such as mixed fermentation agents, humic acid, amino acids, etc. are used to improve the activity of the soil;

[0040] Example 1, prepared by weight, 20 parts of modified zeolite, 1 part of polyurethane synergist with nanometer particle size, 0.5 parts of crosslinking agent, 10 parts of composite fermentation agent, 5 parts of surfactant, 20 parts of carbon nanotube powder, 50 parts of nitrogen, phosphorus and potassium fertilizer, 15 parts of biological organic fertilizer, 30 parts of amino acid powder, 25 parts of humic acid, 5 parts of urea, and an appropriate amount of composite bacteria;

[0041] The modified zeolite is obtained by the following preparation method:

[0042] Add 8% sodium hydroxide by mass, stir thoroughly at room temperature, and filter deionized water; then dry for 24 hours, calcine at 600° C. for 4 hours, and then place in acetone for ultrasonic treatment for 12 minutes, and dry in a vacuum drying oven to obtain a modified zeolite;

[0043] The polyurethane synergist is obtained by the following preparation method:

[0044] Calculated by mass percentage, 15% of diethylenetriamine, 13% of acrylic acid, 5% of benzoyl peroxide, 8% of ethylene glycol, 6% of toluene, and 25% of emulsifier are mixed evenly, and reacted at 65° C. for 6 hours to obtain;

[0045] The composite fermentation agent is obtained by mixed fermentation of white rot mold, solanacearum rickettsius, actinomycetes, bacillus cereus, etc., wherein the surfactant is an alkaneamide salt;

[0046] The specific preparation method is as follows:

[0047] The first step is to grind the modified zeolite powder into micron size, add the polyurethane synergist and stir. The stirring process is carried out under the condition of ultrasonic vibration. The ultrasonic frequency is 20 MHz, the temperature is 40°C, and the stirring time is 20 minutes.

[0048] Step 2: Evenly mix the composite fermentation agent, carbon nanotube powder, surfactant and cross-linking agent, then add the mixture obtained in the first step, stir evenly, and let stand for 3 hours;

[0049] The third step is to heat the bio-organic fertilizer, humic acid, nitrogen, phosphorus and potassium fertilizers and urea to 50° C., mix them evenly with the materials obtained in the second step, then spray the composite bacteria, adjust the water content to 25%, and granulate to obtain a mixed fertilizer.

[0050] Example 2, prepared by weight, 50 parts of modified zeolite, 5 parts of polyurethane synergist with nanometer particle size, 1.0 part of cross-linking agent, 20 parts of composite fermentation agent, 10 parts of surfactant, 30 parts of carbon nanotube powder, 30 parts of nitrogen, phosphorus and potassium fertilizer, 20 parts of biological organic fertilizer, 50 parts of amino acid powder, 35 parts of humic acid, 15 parts of urea, and appropriate amount of composite bacteria;

[0051] The modified zeolite is obtained by the following preparation method:

[0052] Add 17% sodium hydroxide by mass, stir thoroughly at room temperature, and filter deionized water; then dry for 24 hours, calcine at 600° C. for 4 hours, and then place in acetone for ultrasonic treatment for 12 minutes, and dry in a vacuum drying oven to obtain a modified zeolite;

[0053] The polyurethane synergist is obtained by the following preparation method:

[0054] Calculated by mass percentage, 15% of diethylenetriamine, 13% of acrylic acid, 5% of benzoyl peroxide, 8% of ethylene glycol, 6% of toluene and 25% of emulsifier are mixed evenly and reacted at 65° C. for 6 hours to obtain the product.

[0055] The composite bacteria include actinomycetes, soil bacillus, bacillus subtilis and photosynthetic bacteria, and the weight ratio thereof is 3:2:1:2;

[0056] The specific preparation method is as follows:

[0057] The first step is to grind the modified zeolite powder into micron size, add the polyurethane synergist and stir. The stirring process is carried out under the condition of ultrasonic vibration. The ultrasonic frequency is 40 MHz, the temperature is 50°C, and the stirring time is 80 minutes.

[0058] Step 2: Evenly mix the composite fermentation agent, carbon nanotube powder, surfactant and cross-linking agent, then add the mixture obtained in the first step, stir evenly, and let stand for 4 hours;

[0059] The third step is to heat the bio-organic fertilizer, humic acid, nitrogen, phosphorus and potassium fertilizers and urea to 50° C., mix them evenly with the materials obtained in the second step, then spray the composite bacteria, adjust the water content to 28%, and granulate to obtain a mixed fertilizer.

[0060] Example 3, prepared by weight, 30 parts of modified zeolite, 3 parts of polyurethane synergist with nanometer particle size, 0.8 parts of crosslinking agent, 15 parts of composite fermentation agent, 8 parts of surfactant, 25 parts of nano carbon tube powder, 80 parts of nitrogen, phosphorus and potassium fertilizer, 25 parts of biological organic fertilizer, 10 parts of amino acid powder, 30 parts of humic acid, 15 parts of urea, and appropriate amount of composite bacteria;

[0061] The modified zeolite is obtained by the following preparation method:

[0062] Add 18% sodium hydroxide by mass, stir thoroughly at room temperature, and filter deionized water; then dry for 24 hours, calcine at 600° C. for 4 hours, and then place in acetone for ultrasonic treatment for 12 minutes, and dry in a vacuum drying oven to obtain a modified zeolite;

[0063] The polyurethane synergist is obtained by the following preparation method:

[0064] Calculated by mass percentage, 15% of diethylenetriamine, 13% of acrylic acid, 5% of benzoyl peroxide, 8% of ethylene glycol, 6% of toluene and 25% of emulsifier are mixed evenly and reacted at 65° C. for 6 hours to obtain the product.

[0065] The composite fermentation agent is obtained by mixed fermentation of white rot fermentation agent, solanacearum rickettsius fermentation agent, actinomycetes, bacillus cereus, etc., and the surfactant is an alkaneamide salt;

[0066] The specific preparation method is as follows:

[0067] The first step is to grind the modified zeolite powder into micron size, add the polyurethane synergist and stir. The stirring process is carried out under the condition of ultrasonic vibration. The ultrasonic frequency is 50 MHz, the temperature is 60°C, and the stirring time is 120 minutes.

[0068] Step 2: Evenly mix the composite fermentation agent, carbon nanotube powder, surfactant and cross-linking agent, then add the mixture obtained in the first step, stir evenly, and let stand for 3 hours;

[0069] The third step is to heat the bio-organic fertilizer, humic acid, nitrogen, phosphorus and potassium fertilizers and urea to 50° C., mix them evenly with the materials obtained in the second step, then spray the composite bacteria, adjust the water content to 30%, and granulate to obtain a mixed fertilizer.

[0070] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A mixed fertilizer for improving soil activity, characterized in that: include: 20-50 parts of modified zeolite, 1-5 parts of polyurethane enhancer, 0.5-1.0 parts of cross-linking agent, 10-20 parts of composite fermentation agent, 5-10 parts of surfactant, 20-30 parts of carbon nanotube powder, 50-80 parts of nitrogen, phosphorus and potassium fertilizers, 15-30 parts of biological organic fertilizer, 30-50 parts of amino acid powder, 25-35 parts of humic acid, 5-15 parts of urea and appropriate amount of composite bacteria.

2. A mixed fertilizer for improving soil activity according to claim 1, characterized in that: The preparation method of the modified zeolite is: Putting zeolite and activator into a heating furnace in a ratio of 100:8-15, heating to 80-90°C, heating time is 45-55min, stirring while heating, then introducing 2-5% hydrogen chloride gas into the heating furnace, after the zeolite reacts with hydrogen chloride gas for 1-2h, stopping adding hydrogen chloride gas, and adding modifier and modified catalyst liquid, the ratio of modified catalyst to modifier is 2:1-2.5, the mass ratio of modified catalyst and modifier mixture to zeolite is 1:8-15, continuing heating, after the reaction in the reactor is completed, taking out zeolite, and then putting it into the reactor, injecting 40-50% sodium hydroxide solution into the reactor to adjust the pH value to 10, heating to 100-150°C, and keeping for 40-48h to obtain hollow zeolite fiber; The hollow zeolite fiber and sodium chloride are mixed in a mass ratio of 1:8-10 at a temperature of 50-80°C, stirred for 1-2 hours, cooled, washed with clean water, filtered and dried to obtain a modified zeolite.

3. A mixed fertilizer for improving soil activity according to claim 1, characterized in that: The polyurethane synergist is an alkyl polyether amine or a modified polyether amine, and the cross-linking agent is tea saponin or disodium sulfosuccinyl monoester.

4. The mixed fertilizer for improving soil activity according to claim 1, characterized in that: The composite fermentation agent is a microbial preparation, which comprises, by mass, 10 to 25 parts of Bacillus cereus, 9 to 20 parts of Rhodopseudomonas palustris, 8 to 21 parts of Pseudomonas buchneri and 6 to 14 parts of Saccharomyces cerevisiae.

5. The mixed fertilizer for improving soil activity according to claim 1, characterized in that: The surfactant is one or more of dodecyl dimethyl betaine, polyoxyethylene fatty acid ester, and condensate of dodecylphenol and ethylene oxide.

6. The mixed fertilizer for improving soil activity according to claim 1, characterized in that: The nitrogen, phosphorus and potassium fertilizer is obtained by mixing urea, superphosphate and potassium chloride, and the mass ratio of the urea, superphosphate and potassium chloride is 10:5:

3.

7. The mixed fertilizer for improving soil activity according to claim 1, characterized in that: The biological organic fertilizer is mainly composed of plant straw, which is mixed with livestock and poultry manure and obtained through composting.

8. The mixed fertilizer for improving soil activity according to claim 1, characterized in that: The composite bacteria is composed of bacillus cereus, red pseudomonas palustris, pseudomonas buchneri and brewer's yeast in a mass ratio of (2-4):(2-4):(1-2):(1-3).

9. A method for preparing a mixed fertilizer for improving soil activity according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The modified zeolite and the composite fermentation agent are mixed evenly and placed in a reactor, and a polyurethane synergist, a crosslinking agent and a surfactant are added to the reactor, and then the carbon nanotube powder is added and stirred for 45 to 55 minutes to obtain a mixture, and finally the composite bacteria are added to the mixture and stirred for 25 to 75 minutes to obtain a zeolite-based carrier; S2. Take an appropriate amount of clean water, add biological organic fertilizer and amino acid powder to the clean water, heat to 120-130°C while stirring, obtain a solution, mix urea and humic acid in the solution at a mass ratio of 1:3, add nitrogen, phosphorus and potassium fertilizers to the solution, stir for 6-8 hours, and obtain a fertilizer base; S3. Add the fertilizer base material to the zeolite-based carrier, stir for 30 to 35 minutes to obtain a mixture, heat the mixture to 115 to 120° C., and ferment at a constant temperature for 55 to 65 hours, and then cool to obtain the mixture.

10. The method for preparing a mixed fertilizer for improving soil activity according to claim 9, characterized in that: In S1, the composite bacteria is added to the mixture and stirring is continued for 50 to 60 minutes.

Images