Composite water-soluble fertilizer, preparation method and application thereof

Abstract

The application discloses a kind of composite water-soluble fertilizer and its preparation method and application, belong to crop fertilizer field, a kind of composite water-soluble fertilizer, including following raw materials: composite microbial inoculant solid carrier 8-10 parts, inorganic fertilizer granules 30-40 parts and anti-caking agent 2-5 parts.The application utilizes seaweed polysaccharide to improve the survival rate of microbial bacteria in the composite microbial inoculant solid carrier prepared by freeze drying, by adding anti-caking agent, the composite microbial inoculant solid carrier and inorganic fertilizer granules do not occur bonding and caking between, reduce the contact between microbial bacteria and inorganic salt, avoid the damage of inorganic salt to bacteria, so that the survival rate of microbial bacteria in the prepared composite water-soluble fertilizer is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of crop fertilizers, and particularly relates to a compound water-soluble fertilizer and a preparation method and application thereof. BACKGROUND

[0002] Fertilizer is an important material for maintaining and improving soil fertility and realizing sustainable development of agriculture. Compound microbial fertilizer is compounded by specific microorganisms and traditional fertilizer. Long-term use of compound microbial fertilizer can improve the physical and chemical properties of soil, increase the soil available fertility, inhibit the occurrence of soil-borne diseases, and promote the growth of crops, which is of great significance to yield increase and sustainable development of agriculture. In the preparation process of the existing compound microbial fertilizer, one of the adding modes of microorganisms is mixing and granulating of the microbial strains and traditional fertilizer. In the process of adding microorganisms in the granulation process, high temperature, high salt, drying and other factors can cause a large number of microorganisms to die, especially the high ion concentration in inorganic fertilizer has a strong killing effect on microorganisms. When the salt concentration in the compound water-soluble fertilizer is too high, the activity of the microbial agent can be inhibited, and high concentration of salt can reduce the water content in the microbial cells, thereby affecting the normal metabolism and growth of the microorganisms.

[0003] In addition, the main raw materials of the compound water-soluble fertilizer include urea, monoammonium phosphate, diammonium phosphate, potassium nitrate, potassium sulfate, ammonium sulfate and the like. Most of these raw materials contain crystal water and have strong hygroscopicity. When these raw materials are mixed, the critical hygroscopic point of the mixture will be significantly lower than that of the single substance, which makes it easier to absorb moisture and caking. The chemical reactions that can occur between different raw materials can also exacerbate the caking phenomenon. During storage, if the pressure of the accumulation is too large, the plastic deformation of the compound fertilizer particles will be larger, the contact area between the particles will be larger, the distance between the particles will be smaller, and the molecular attraction will be increased, which creates favorable conditions for the reaction and recrystallization of the fertilizer, so that the fertilizer is prone to caking.

[0004] There is an urgent need in the art for a compound water-soluble fertilizer which can prevent caking of compound fertilizer particles and improve the survival rate of microorganisms. SUMMARY

[0005] The purpose of the present application is to provide a compound water-soluble fertilizer and a preparation method and application thereof to solve the problems existing in the prior art.

[0006] One of the technical solutions provided by the present application is:

[0007] A compound water-soluble fertilizer, according to mass fraction, comprises the following raw materials: 8-10 parts of compound microbial agent carrier, 30-40 parts of inorganic fertilizer particles and 2-5 parts of anti-caking agent.

[0008] Preferably, the preparation method of the complex microbial agent carrier comprises the following steps: adding a complex enzyme into a microwave extraction treatment liquid of sargassum, adding a fermentation microbial agent after constant temperature water bath, obtaining seaweed extract after closed fermentation, adding mineral potassium fulvate and medical stone powder into the seaweed extract, stirring and mixing, centrifuging, and freeze-drying the obtained medical stone powder to obtain the complex microbial agent carrier.

[0009] The mineral potassium fulvate is a high-quality organic potassium fertilizer, which can increase the fertility of soil and improve the soil structure, and the addition of the mineral potassium fulvate into the seaweed extract can further improve the fertilizer efficiency of the complex microbial agent.

[0010] Freeze-drying is a drying method that pre-cools the substance containing a large amount of water into a solid, and then removes the ice directly under vacuum conditions. The whole process is carried out at low temperature, so that the freeze-drying provides an effective preparation method for the bioactive substances (such as microorganisms). However, the freeze-drying also has adverse effects, such as changing the physical state of membrane lipids and the structure of sensitive proteins, and further causing the death of the bacterial cells. The active substances such as proteins on the surface of the bacterial cells are surrounded by a water film, which is the material basis for maintaining the molecular structure and function of the bacterial cells. The destruction of the water film during the freeze-drying dehydration will cause irreversible changes in the structure of the biological molecules, resulting in the loss of activity of the bacterial cells. In the freeze-drying dehydration process of the present application, the hydroxyl groups of the seaweed polysaccharides in the seaweed extract can form hydrogen bonds with the polar groups of the biological molecules, replacing the water molecules lost around the polar groups, so that a layer of pseudo water film is formed on the surface of the biological molecules, which can protect the connection position of the hydrogen bonds from being directly exposed to the surrounding environment, stabilize the high-order structure of the biological molecules, prevent denaturation, and further improve the survival rate of the bacterial cells in the freeze-drying process.

[0011] More preferably, the particle size of the medical stone powder is 500-1000 mesh.

[0012] Preferably, the complex enzyme is mixed by cellulase, beta-glucanase and papain according to the mass ratio of 1:2:1.5.

[0013] Preferably, the fermentation microbial agent is mixed by Aspergillus niger, Trichoderma reesei and Bacillus according to the mass ratio of 2:1.5:1.

[0014] Preferably, the mass ratio of the seaweed extract, the mineral potassium fulvate and the medical stone powder is 100:(5-10):20.

[0015] Preferably, the preparation method of the inorganic fertilizer particles comprises the following steps: subjecting a mixed fertilizer of urea, diammonium phosphate and potassium sulfate to plasma irradiation treatment, crushing and ionizing the mixed fertilizer, mixing the crushed and ionized mixed fertilizer, polyacrylamide and meitai powder, and obtaining the inorganic fertilizer particles.

[0016] More preferably, the mass fractions of the urea, diammonium phosphate and potassium sulfate are 20-30 parts, 20-40 parts and 10-30 parts, respectively, the mass ratio of the mixed fertilizer and meitai powder is 10:1, and the addition amount of the polyacrylamide is 1.5-2.0% of the sum of the mass of the mixed fertilizer and meitai powder.

[0017] The present application subjects the fertilizer particles to irradiation treatment by using a plasma process, so that the fertilizer particles are decomposed into an ionic state, and then the ionic surface is coated with polyacrylamide by high-speed mixing, so as to prevent the ions from recombining, and the meitai powder containing rich trace elements is used for adsorption, so as to maintain the fertilizer efficiency.

[0018] Preferably, the anti-caking agent is a mixture of hydroxypropyl chitosan and a surfactant in a mass ratio of 1:2.

[0019] Both the hydroxypropyl chitosan and the surfactant have the ability to reduce the surface tension, so as to reduce the mutual attraction and adhesion between the fertilizer particles. The two form a stable film and lubricating layer between the fertilizer particles, so as to isolate the fertilizer particles and reduce the invasion of water and moisture, and through the dispersion and lubrication, the fertilizer particles are more easily to slide and separate, so as to improve the dispersibility and fluidity of the fertilizer.

[0020] More preferably, the surfactant is sodium dodecyl benzene sulfonate.

[0021] The second technical solution provided by the present application is as follows:

[0022] A preparation method of the above-mentioned composite water-soluble fertilizer comprises the following steps: taking each raw material according to the mass fraction, adding an anti-caking agent into boiling water, stirring uniformly, cooling to room temperature to obtain an anti-caking agent aqueous solution, adding a composite microbial agent carrier, mixing uniformly, and then obtaining a composite powder of the composite microbial agent carrier and the anti-caking agent through freeze-drying, and mixing the composite powder and the inorganic fertilizer particles uniformly to obtain the composite water-soluble fertilizer.

[0023] Preferably, the mass ratio of the anti-caking agent to the boiling water is (2-5):10.

[0024] The third technical solution provided by the present application is as follows:

[0025] The above-mentioned composite water-soluble fertilizer is applied in banana planting, and the composite water-soluble fertilizer is added into water, stirred uniformly, and then applied in an irrigation mode.

[0026] The present application adsorbs the microbial agent and the potassium fulvate of mineral origin in the powder of medical stone, and gathers the inorganic mixed fertilizer which is crushed and ionized in the powder of medical stone.

[0027] Compared with the prior art, the present application has the following advantages and technical effects:

[0028] The present application uses the sea algae polysaccharide to improve the survival rate of the microbial bodies in the composite microbial agent solid carrier prepared by freeze drying, prevents the composite microbial agent solid carrier and the inorganic fertilizer particles from being bonded and caked by adding the anti-caking agent, reduces the contact between the microbial bodies and the inorganic salts, avoids the damage of the inorganic salts to the microbial bodies, and makes the survival rate of the microbial bodies in the prepared composite water-soluble fertilizer high, so that the growth performance of crops can be improved. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail, which should be considered to be illustrative of the application and not restrictive of the application. It will be appreciated that the detailed description is not intended to limit the scope of the application, but rather to provide a more thorough description of some aspects, features and embodiments of the application.

[0030] It should be understood that the terms used in the present application are merely used to describe particular embodiments and are not intended to limit the present application. In addition, for the numerical ranges in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range within the stated range and between any other stated value or intermediate value in the stated range is also encompassed within the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, the preferred methods and materials are described. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict between the content of the specification and that of any document incorporated by reference, the content of the specification prevails.

[0032] Various modifications and changes can be made to the specific embodiments of the present application described herein without departing from the scope or spirit of the application. Other embodiments of the application will be apparent to those of ordinary skill in the art from consideration of the description and practice of the application disclosed herein. The specification and examples given herein are exemplary only. It is to be understood that the application is not limited in any way by the specific construction, materials or embodiments described herein.

[0033] With respect to the use of "comprising", "including", "containing", "having" and other similar forms in the description, these terms are used to indicate included but not to exclude other matters.

[0034] Room temperature of the present application refers to 25±2℃.

[0035] The 'parts' in the embodiments of the present application are'mass parts' unless otherwise specified.

[0036] The particle size of the medical stone powder in the embodiments of the present application is 500 mesh;

[0037] The composite enzyme, Aspergillus niger, Trichoderma reesei and Bacillus in the embodiments of the present application are commercially available.

[0038] Preparation method of a composite water-soluble fertilizer

[0039] S1. Preparation of a composite microbial agent carrier: Sargassum was washed and cut into pieces, 10 times the weight of water was added for microwave extraction (microwave power 1000W, temperature 35℃), a total of 3 times of extraction, the 3 times of extraction solutions were combined, a composite enzyme composed of cellulase, beta-glucanase and papain in a mass ratio of 1:2:1.5 was added, the amount of the composite enzyme was 3% of the mass of the microwave extraction solution, constant temperature water bath (28℃, 40min), then a fermentation microbial agent composed of Aspergillus niger, Trichoderma reesei and Bacillus in a mass ratio of 2:1.5:1 was added, the amount of the fermentation microbial agent was 2% of the mass of the microwave extraction solution, after sealing fermentation (the rotation speed of the reaction kettle was 180r / min, the fermentation time was 24h, and the pH was 7.5), a seaweed extract was obtained, mineral source fulvic acid potassium and medical stone powder were added to the seaweed extract (the mass ratio of the seaweed extract, the mineral source fulvic acid potassium and the medical stone powder was 100:10:20), stirring and mixing (the rotation speed was 200rpm, 1h), centrifugation, the obtained medical stone powder was freeze-dried to obtain a composite microbial agent carrier;

[0040] S2. Preparation of inorganic fertilizer particles: 20 parts of urea, 40 parts of diammonium phosphate and 30 parts of potassium sulfate were mixed and then sent into a plasma reactor for plasma irradiation treatment (power 1000W, frequency 10KHz, irradiation temperature 30℃, input gas source pressure 0.008MPa-0.010MPa), so that the fertilizer particles were crushed and ionized, 9 parts of medical stone powder, 2 parts of polyacrylamide and the obtained ionized mixed fertilizer were sent into a reaction kettle for sufficient mixing and adsorption (time 40min, rotation speed 100r / min), to obtain inorganic fertilizer particles;

[0041] S3. Hydroxypropyl chitosan and sodium dodecyl benzene sulfonate were mixed in a mass ratio of 1:2 to obtain an anti-caking agent;

[0042] S4. 4 parts of the anti-caking agent were added into 10 parts of boiling water, and stirred uniformly, and then cooled to room temperature to obtain an anti-caking agent aqueous solution, 10 parts of the composite microbial inoculant carrier were added, and mixed uniformly, and then freeze-dried to obtain a composite powder of the composite microbial inoculant carrier and the anti-caking agent, and the obtained composite powder and 40 parts of the inorganic fertilizer particles were mixed uniformly to prepare the composite water-soluble fertilizer.

[0043] Example 2

[0044] S1. Preparation of the composite microbial inoculant carrier: Sargassum thunbergii was washed and cut into pieces, and then subjected to microwave extraction (microwave power: 1000 W, temperature: 35℃) with 10 times the weight of water, and the extraction was performed for 3 times. The extracted solutions were combined, and then a composite enzyme prepared by mixing cellulase, β-glucanase and papain at a mass ratio of 1:2:1.5 was added in an amount of 3% of the mass of the microwave extraction solution. After constant temperature water bath (28℃, 40 min), a fermentation inoculant prepared by mixing Aspergillus niger, Trichoderma reesei and Bacillus at a mass ratio of 2:1.5:1 was added in an amount of 2% of the mass of the microwave extraction solution. After sealed fermentation (reaction kettle rotation speed: 180 r / min, fermentation time: 24 h, pH: 7.5), a seaweed extract was obtained. The seaweed extract was added with mineral source potassium fulvate and maifanite powder (mass ratio of the seaweed extract, the mineral source potassium fulvate and the maifanite powder: 100:5:20), stirred and mixed uniformly (rotation speed: 200 rpm, 1 h), and then centrifuged. The obtained maifanite powder was freeze-dried to obtain the composite microbial inoculant carrier.

[0045] S2. Preparation of the inorganic fertilizer particles: 20 parts of urea, 40 parts of diammonium phosphate and 30 parts of potassium sulfate were mixed, and then subjected to plasma irradiation treatment (power: 1000 W, frequency: 10 KHz, irradiation temperature: 30℃, input gas source pressure: 0.008 MPa-0.010 MPa) in a plasma reactor to crush and ionize the fertilizer particles. 9 parts of maifanite powder, 2 parts of polyacrylamide and the ionized mixed fertilizer were put into a reaction kettle to mix and adsorb (time: 40 min, rotation speed: 100 r / min) to obtain the inorganic fertilizer particles.

[0046] S3. The hydroxypropyl chitosan and sodium dodecyl benzene sulfonate were mixed at a mass ratio of 1:2 to obtain the anti-caking agent.

[0047] S4. 4 parts of the anti-caking agent were added into 10 parts of boiling water, and stirred uniformly, and then cooled to room temperature to obtain an anti-caking agent aqueous solution, 10 parts of the composite microbial inoculant carrier were added, and mixed uniformly, and then freeze-dried to obtain a composite powder of the composite microbial inoculant carrier and the anti-caking agent, and the obtained composite powder and 40 parts of the inorganic fertilizer particles were mixed uniformly to prepare the composite water-soluble fertilizer.

[0048] Example 3

[0049] S1. Preparation of the composite microbial inoculant carrier: Sargassum thunbergii was washed and cut into pieces, and was subjected to microwave extraction with 10 times the weight of water (microwave power 1000 W, temperature 35°C) for a total of 3 times. The 3 extraction solutions were combined, and a composite enzyme prepared by mixing cellulase, β-glucanase and papain at a mass ratio of 1:2:1.5 was added in an amount of 3% of the mass of the microwave extraction solution. After constant temperature water bath (28°C, 40 min), a fermentation inoculant prepared by mixing Aspergillus niger, Trichoderma reesei and Bacillus at a mass ratio of 2:1.5:1 was added in an amount of 2% of the mass of the microwave extraction solution. After sealing fermentation (reaction kettle rotation speed 180 r / min, fermentation time 24 h, pH 7.5), a seaweed extract solution was obtained. To the seaweed extract solution, mineral source fulvic acid potassium and maifanite powder were added (mass ratio of seaweed extract solution, mineral source fulvic acid potassium and maifanite powder 100:8:20), and were stirred and mixed uniformly (rotation speed 200 rpm, 1 h). The obtained maifanite powder was subjected to freeze-drying to obtain the composite microbial inoculant carrier.

[0050] S2. Preparation of inorganic fertilizer particles: 20 parts of urea, 40 parts of diammonium phosphate and 30 parts of potassium sulfate were mixed and then were subjected to plasma irradiation treatment in a plasma reactor (power 1000 W, frequency 10 KHz, irradiation temperature 30°C, input gas source pressure 0.008 MPa-0.010 MPa) to crush and ionize the fertilizer particles. 9 parts of maifanite powder, 2 parts of polyacrylamide and the ionized mixed fertilizer were fed into a reaction kettle and were mixed and adsorbed (time 40 min, rotation speed 100 r / min) to obtain inorganic fertilizer particles.

[0051] S3. Hydroxypropyl chitosan and sodium dodecyl benzene sulfonate were mixed at a mass ratio of 1:2 to obtain an anti-caking agent.

[0052] S4. 5 parts of the anti-caking agent were added to 10 parts of boiling water, and were stirred and mixed uniformly and then were cooled to room temperature to obtain an anti-caking agent aqueous solution. 9 parts of the composite microbial inoculant carrier were added and were mixed uniformly, and then were subjected to freeze-drying to obtain a composite powder of the composite microbial inoculant carrier and the anti-caking agent. The obtained composite powder and 40 parts of the inorganic fertilizer particles were mixed uniformly to obtain the composite water-soluble fertilizer.

[0053] Comparative Example 1

[0054] S1. Preparation of the composite microbial inoculant carrier: Sargassum was washed and cut into pieces, and then extracted by microwave extraction (microwave power 1000 W, temperature 35°C) with 10 times the weight of water. The extraction was repeated 3 times, and the 3 times of extraction solutions were combined. Fermentation inoculant was added, which was a mixture of Aspergillus niger, Trichoderma reesei and Bacillus in a mass ratio of 2:1.5:1. The fermentation inoculant accounted for 2% of the mass of the microwave extraction solution. After sealing fermentation (the rotation speed of the reaction kettle was 180 r / min, the fermentation time was 24 h, and the pH was 7.5), a seaweed extract was obtained. Mineral source fulvic acid potassium and medical stone powder were added to the seaweed extract (the mass ratio of seaweed extract, mineral source fulvic acid potassium and medical stone powder was 100:10:20), and then stirred and mixed (the rotation speed was 200 rpm, and the stirring time was 1 h). The obtained medical stone powder was centrifuged and freeze-dried to obtain the composite microbial inoculant carrier.

[0055] S2-S4 were the same as in Example 1.

[0056] Comparative Example 2

[0057] S1-S2 were the same as in Example 1.

[0058] S3. Hydroxypropyl chitosan and sodium dodecyl benzene sulfonate were mixed in a mass ratio of 1:1 to obtain an anti-caking agent.

[0059] S4. The same as in Example 1.

[0060] Comparative Example 3

[0061] A commercially available water-soluble fertilizer was used.

[0062] Accelerated caking test

[0063] The composite water-soluble fertilizers prepared in Examples 1-3 and Comparative Examples 1-2 and the commercially available water-soluble fertilizer of Comparative Example 3 were placed in a breathable bag, and pressure was applied to compact them. The breathable bag containing the water-soluble fertilizer was placed in a test box. During the day, the temperature was controlled at 30°C, and the relative humidity was 75%. At night, the power of the test box was turned off to reduce the temperature to room temperature and the ambient humidity. After 7 days, the samples were taken out, and each side of the sample was dropped from a height of 1 m once. After unpacking, the samples were sieved with a standard sieve. The anti-caking effect was tested by the caking rate, which was calculated according to formula (1). The test results are shown in Table 1.

[0064] Caking rate (%) = mass of caked composite water-soluble fertilizer / mass of original composite water-soluble fertilizer × 100% (1)

[0065] Table 1

[0066]

[0067] Application of the composite water-soluble fertilizer in banana planting

[0068] Application Example 1

[0069] The banana seedlings were transplanted about 1 week after planting, and the composite water-soluble fertilizer prepared in Example 1, urea and potassium dihydrogen phosphate were dissolved in water, stirred uniformly, and the concentration of the fertilizer solution was about 0.5%, once every 7 days, 1.5 kg per plant, a total of 4 times. When the banana grew 6-8 leaves, the banana field seedling fertilization was started, 40 g of the composite water-soluble fertilizer prepared in Example 1, 33 g of urea and 17 g of potassium sulfate per plant each time, the composite water-soluble fertilizer prepared in Example 1, urea and potassium sulfate were added to the fertilization tank, stirred uniformly and dissolved, and stirred constantly during the fertilization process to ensure uniform dispersion, once every 10 days or so, a total of 4 times, and the fertilization tank and pipeline should be washed with water after the fertilizer solution was applied. When the banana grew 15-18 leaves, the vigorous growth period fertilization was started, 50 g of the composite water-soluble fertilizer prepared in Example 1, 47 g of urea and 81 g of potassium sulfate per plant each time, the composite water-soluble fertilizer prepared in Example 1, urea and potassium sulfate were added to the fertilization tank, stirred uniformly and dissolved, and stirred constantly during the fertilization process to ensure uniform dispersion, once every 15 days or so, a total of 4 times, and the fertilization tank and pipeline should be washed with water after the fertilizer solution was applied. When the banana grew 26-28 leaves, the banana bud period fertilization was started, 38 g of the composite water-soluble fertilizer prepared in Example 1, 19 g of urea and 75 g of potassium sulfate per plant each time, the composite water-soluble fertilizer prepared in Example 1, urea and potassium sulfate were added to the fertilization tank, stirred uniformly and dissolved, and stirred constantly during the fertilization process to ensure uniform dispersion, once every 10 days or so, a total of 5 times, and the fertilization tank and pipeline should be washed with water after the fertilizer solution was applied. When the banana grew more than 30% of the buds, the fruiting fertilizer was applied, 25 g of the composite water-soluble fertilizer prepared in Example 1, 13 g of urea and 50 g of potassium sulfate per plant each time, the composite water-soluble fertilizer prepared in Example 1, urea and potassium sulfate were added to the fertilization tank, stirred uniformly and dissolved, and stirred constantly during the fertilization process to ensure uniform dispersion, once every 15 days or so, a total of 2 times, and the fertilization tank and pipeline should be washed with water after the fertilizer solution was applied.

[0070] Application Example 2-6

[0071] The same as Example 1, except that the composite water-soluble fertilizer in Application Example 1 was replaced by the composite water-soluble fertilizer of Examples 2-3 and Proportions 1-2, and the commercially available water-soluble fertilizer of Comparative Example 3.

[0072] The banana yield was determined, and the results are shown in Table 2.

[0073] Table 2

[0074]

[0075] As can be seen from Table 2, the banana plant yields of the composite water-soluble fertilizers prepared from Examples 1-3 of the present application are all better than those of the composite water-soluble fertilizers prepared from Comparative Examples 1-2 and the commercially available water-soluble fertilizer of Comparative Example 3. Comparative Example 1 does not use the composite enzyme to decompose the microwave-extracted solution of Sargassum, but directly uses it for sealed fermentation, which results in a decrease in the release of polysaccharides, and causes the hydration membrane of the bacteria to be destroyed when the bentonite that adsorbs the bacteria and potassium fulvate is freeze-dried, which results in irreversible changes in the biological molecular structure and loss of the activity of the bacteria, and finally affects the fertilizer efficiency; the composite water-soluble fertilizer prepared from Comparative Example 2 appears to be caked, and the effective components cannot be fully dissolved in water during the fertilization process, which results in loss of the fertilizer and causes the inorganic salt to harm the bacteria after caking, which reduces the survival rate of the microorganism in the composite water-soluble fertilizer, and under the same fertilization amount, the fertilizer efficiency is reduced.

[0076] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A compound water-soluble fertilizer, characterized by, According to the mass parts, the following raw materials are included: 8-10 parts of the composite microbial agent carrier, 30-40 parts of inorganic fertilizer particles, and 2-5 parts of an anti-caking agent; The preparation method of the composite microbial agent carrier comprises the following steps: adding a composite enzyme to a microwave extraction treatment liquid of Sargassum, adding a fermentation microbial agent after constant temperature water bath, obtaining seaweed extract after closed fermentation, adding mineral potassium fulvic acid and maifanite powder to the seaweed extract, stirring and mixing, centrifuging, and freeze-drying the obtained maifanite powder to obtain the composite microbial agent carrier. The mass ratio of the seaweed extract, the mineral potassium fulvic acid, and the maifanite powder is 100:(5-10):

20. The anti-caking agent is a mixture of hydroxypropyl chitosan and a surfactant in a mass ratio of 1:

2. The preparation method of the composite water-soluble fertilizer comprises the following steps: taking each raw material according to the mass parts, adding an anti-caking agent to boiling water, stirring uniformly, cooling to room temperature to obtain an anti-caking agent aqueous solution, adding a composite microbial agent carrier, mixing uniformly, and obtaining a composite powder of the composite microbial agent carrier and the anti-caking agent by freeze-drying, and mixing the composite powder and inorganic fertilizer particles uniformly to prepare the composite water-soluble fertilizer. The mass ratio of the anti-caking agent and boiling water is (2-5):

10.

2. The compound water-soluble fertilizer according to claim 1, characterized by, The composite enzyme is a mixture of cellulase, beta-glucanase, and papain in a mass ratio of 1:2:1.

5. The fermentation microbial agent is a mixture of Aspergillus niger, Trichoderma reesei, and Bacillus in a mass ratio of 2:1.5:

1.

3. The compound water-soluble fertilizer according to claim 1, characterized by, The preparation method of the inorganic fertilizer particles comprises the following steps: performing plasma irradiation treatment on a mixed fertilizer of urea, diammonium phosphate, and potassium sulfate, pulverizing and ionizing the mixed fertilizer, and mixing the pulverized and ionized mixed fertilizer, polyacrylamide, and maifanite powder to prepare the inorganic fertilizer particles.

4. Use of the compound water-soluble fertilizer according to any one of claims 1 to 3 in banana cultivation, characterized in that, The composite water-soluble fertilizer of any one of claims 1-3 is added to water, stirred uniformly, and applied by irrigation.

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