Silicon-containing water-soluble fertilizer and preparation process thereof

Abstract

The invention discloses a silicon-containing water-soluble fertilizer, which is prepared from the following ingredients in parts by weight: 15 to 45 parts of modified nano silicon dioxide, 10 to 15 parts of humic acid-fulvic acid compounds, 1 to 3 parts of chelating agents, 1 to 3 parts of modified methyl trisiloxane organic silicon, 10 to 13 parts of modified silicate, 2 to 3 parts of microorganism compound bacterium agents and 50 to 60 parts of deionized water. The preparation method comprises the following process steps: dissolving nano silicon dioxide in deionized water, adding a silicate ester coupling agent, stirring and reacting to prepare modified nano silicon dioxide, mixing silicate and citric acid according to a ratio, stirring, and centrifugally filtering to prepare modified silicate; uniformly mixing the modified methyltrisiloxane organic silicon and the modified nano silicon dioxide in proportion, and stirring for reaction; adding the chelating agent, the modified silicate, the deionized water and the microbial composite inoculant, stirring and dissolving, uniformly mixing, and adding the humic acid-fulvic acid compound to adjust the pH value, so as to obtain the water-soluble fertilizer. The produced water-soluble fertilizer is high in silicon content, resistant to precipitation, long in fertilizer efficiency and capable of promoting growth and increasing the crop yield.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural fertilizers, in particular to a silicon-containing water-soluble fertilizer and a preparation process thereof. BACKGROUND

[0002] Silicon is the most common element in the earth's crust after oxygen. With the research finding that silicon has many beneficial effects on plants, including enhancing plant resistance, increasing yield and resistance to pests and diseases. With the development of existing technology, some fertilizer products have begun to apply silicon elements to fertilizers. In natural areas with low silicon content, the use of silicon fertilizer can reduce the amount and rate of fungicide application, reduce production costs, and optimize control measures; foliar application of fertilizers containing potassium silicate and magnesium silicate can improve the nutrient content and yield of flax; the application of silicon fertilizer also has an improvement effect on the root characteristics of plants, such as total root length, root surface area and lateral root length, thereby inducing plant resistance to drought and trace element deficiency conditions. Although there are great differences in the absorption of silicon among rice, tomatoes and cotton, silicon fertilizer shows yield-increasing effects in all crops.

[0003] At present, there are three types of traditional silicon fertilizers: insoluble silicon fertilizer, silicon sol silicon fertilizer and water-soluble silicon fertilizer. The insoluble silicon fertilizer is mostly steel slag from steel mills processed by high-temperature calcination process, and this solid fertilizer needs a long dissolution process when applied, needs a large amount of application and has slow fertilizer efficiency, which is easy to cause imbalance of soil pH and is difficult to meet the demand for quick-acting of modern agriculture. The silicon sol silicon fertilizer improves the pH tolerance, but has high cost and lacks the synergistic effect of organic silicon. The water-soluble silicon fertilizer (such as sodium silicate and potassium silicate) has too strong alkalinity, which is easy to cause seedling burning, and is easy to generate precipitate when mixed with phosphorus fertilizer, thereby limiting the use range. Moreover, most of the existing water-soluble silicon fertilizers have complex process and high production cost.

[0004] Therefore, the present application provides a silicon-containing water-soluble fertilizer and a preparation process thereof to solve the problems of low effective component, easy precipitation and short fertilizer efficiency of traditional silicon fertilizer, improve soil quality, promote plant growth and increase crop yield. SUMMARY

[0005] The present application aims to provide a silicon-containing water-soluble fertilizer and a preparation process thereof to solve the problems of low effective component, easy precipitation and short fertilizer efficiency of traditional silicon fertilizer as mentioned in the background.

[0006] In a first aspect, a silicon-containing water-soluble fertilizer is prepared from the following raw materials by weight: modified nano-silicon dioxide 20-60 parts, humic acid-humic acid complex 10-15 parts, chelating agent 1-3 parts, modified methyltrisiloxane organosilicon 1-3 parts, modified silicate 10-13 parts, microbial complex inoculant 2-3 parts, and deionized water 50-60 parts.

[0007] In a second aspect, a preparation process of a water-soluble fertilizer containing silicon comprises the following steps:

[0008] S1. Preparing raw materials: dissolving nano-silicon dioxide with a particle size of 50-100 nm in deionized water to make the solid content 10%-20%, adding a silicon ester coupling agent, stirring and reacting for 3-4 hours at a temperature of 55-60 DEG C, to obtain modified nano-silicon dioxide; uniformly mixing silicate and citric acid with a concentration of 6%-10% at a mass ratio of 1:5-1:10, stirring for 1-2 hours, and centrifuging and filtering to obtain modified silicate.

[0009] S2. Mixing the modified methyltrisiloxane and the modified nano-silicon dioxide uniformly, stirring and reacting for 2-2.5 hours at a temperature of 55-60 DEG C, to obtain a modified mixed solution.

[0010] S3. Adding a chelating agent, the modified silicate, deionized water and a microbial complex bacterium agent to the modified mixed solution, stirring and dissolving, mixing uniformly, adding a humic acid-fulvic acid compound to adjust the pH, and obtaining a water-soluble fertilizer.

[0011] As a preferred technical solution of the present application, the silicon ester coupling agent is one or both of ethyl silicate and propyl silicate, and the addition amount of the silicon ester coupling agent is 1%-5% of the mass of the nano-silicon dioxide.

[0012] As a preferred technical solution of the present application, the silicate is one or both of calcium silicate and magnesium silicate.

[0013] As a preferred technical solution of the present application, the centrifugal rotation speed is 3000-4000 rpm.

[0014] As a preferred technical solution of the present application, the modified methyltrisiloxane and the modified nano-silicon dioxide are mixed at a weight ratio of 1:15.

[0015] As a preferred technical solution of the present application, the microbial complex bacterium agent is composed of Paenibacillus mucilaginosus and Bacillus subtilis at a mass ratio of 1:1.

[0016] As a preferred technical solution of the present application, the chelating agent is one or both of EDTA chelated boron and EDTA chelated zinc.

[0017] As a preferred technical solution of the present application, the humic acid-fulvic acid compound is composed of potassium humate and fulvic acid at a mass ratio of 3:1, and the pH is adjusted to 6.7-7.1.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. This invention incorporates modified nano-silica during fertilizer production. The surface of nano-silica contains numerous silanol groups. These highly reactive hydroxyl groups react with silicate ester coupling agents, reducing the number of hydroxyl groups, weakening hydrophilicity, and enhancing hydrophobicity. Simultaneously, the coupling agent undergoes a condensation reaction with the hydroxyl groups on the nano-silica surface, forming Si-O-Si covalent bonds, introducing organic groups and forming an organic coating. This organic coating layer prevents direct contact between particles through physical barriers, significantly reducing the tendency to aggregate. The modified nano-silica exhibits strong hydrophobicity, making it easier to spread on plant leaves. The modified methyltrisiloxane organosilicon, through hydrogen bonding, forms a "silicon-organosilicon complex" that can penetrate the leaf cuticle and directly enter the intercellular spaces of plants. This complex carries silicon to the plant's growth point, promoting cell wall silicification, enhancing lodging resistance, and increasing silicon absorption. The improved dispersibility of the modified nano-silica reduces the risk of soil compaction caused by aggregation. Simultaneously, the organic coating layer reduces silicon loss, minimizes water pollution, improves plant silicon absorption efficiency, enhances plant growth performance, strengthens cell walls, and increases resistance to pests and diseases.

[0020] 2. This invention incorporates modified silicates during fertilizer production, avoiding the risks of soil alkalization and seedling burn. Natural calcium silicate and magnesium silicate have low water solubility, making them difficult for plants to absorb. By utilizing the H⁺ in mild citric acid to react with metal ions in silicates, the silicon-oxygen tetrahedral structure is destroyed, generating soluble silicic acid and salts, significantly increasing the soluble silicon content in the fertilizer. At the same time, the organic acids used are inexpensive, and the operation process is simple. The metal salts generated by acid treatment are also essential micronutrients for plants, which can work synergistically with silicon to improve crop resistance.

[0021] 3. This invention incorporates a microbial compound agent of *Bacillus spp.* and *Bacillus subtilis* during fertilizer production. *Bacillus spp.* secretes organic acids and capsular polysaccharides, which decompose insoluble silicate minerals in the soil through acid dissolution and complexation, releasing soluble silicon, phosphorus, potassium, and trace elements such as calcium, magnesium, and iron. Simultaneously, it can combine with nano-silica, which promotes the reproduction of beneficial soil microorganisms. The microbial metabolites dissolve the fixed silicon, forming a "release-fixation-re-release" cycle, achieving a slow-release effect, prolonging fertilizer efficacy, and reducing fertilization frequency. *Bacillus subtilis* produces antibacterial substances such as subtilisin and polymyxin, thereby inhibiting the growth of soil pathogens. Synergistically with silicon, it enhances the colonization ability of pathogens, significantly improves silicon absorption, and increases crop lodging resistance. The synergistic effect of *Bacillus spp.* and *Bacillus subtilis* achieves silicon activation, nutrient release, disease resistance, and growth promotion. Attached Figure Description

[0022] Figure 1 This is a flow chart of the silicon-containing water-soluble fertilizer preparation process of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0024] There are a large number of silicon hydroxyl groups on the surface of nano-silicon dioxide. These hydroxyl groups with high reactivity react with silicate coupling agents, the number of hydroxyl groups on the surface is reduced, the hydrophilicity is weakened, and the hydrophobicity is enhanced. At the same time, the coupling agent reacts with the hydroxyl groups on the surface of nano-silicon dioxide to form Si-O-Si covalent bonds, and organic groups are introduced to form an organic covering surface. The organic coating layer prevents direct contact between particles by physical barrier, significantly reducing the agglomeration tendency. The modified nano-silicon dioxide has strong hydrophobicity, which is more easily spread and penetrate on the plant leaf surface. The modified methyltrisiloxane organosilicon forms a "silicon-organosilicon complex" through hydrogen bonding, penetrates the cuticle layer of the leaf, and directly enters the intercellular space of the plant, carrying silicon elements to the plant growth point, promoting cell wall silicification, enhancing the resistance to lodging, and improving the silicon absorption rate. The dispersibility of the modified nano-silicon dioxide is improved, reducing the risk of soil compaction caused by agglomeration. At the same time, the organic coating layer can reduce the loss of silicon elements, reduce the pollution to water bodies, improve the absorption efficiency of silicon elements by plants, enhance the growth performance of plants, strengthen the cell wall, and improve the ability to resist diseases and pests.

[0025] Natural silicates such as calcium silicate and magnesium silicate have low water solubility, and plants are difficult to absorb. The H⁺ in the mild citric acid reacts with the metal ions in the silicate, thereby destroying the silicon-oxygen tetrahedral structure, generating soluble silicic acid and salts, and significantly improving the content of soluble silicon in the fertilizer. At the same time, the organic acid used is low in price and simple in operation process; the metal salt generated by acid treatment is also a necessary trace element for plants, which can synergistically act with silicon elements to improve the stress resistance of crops.

[0026] The jelly-like Paenibacillus can secrete organic acids and capsular polysaccharides, decompose the soil insoluble silicate minerals by acid dissolution and complexation, release soluble silicon, phosphorus, potassium and trace elements such as calcium, magnesium and iron, and can be combined with nano silicon dioxide; the silicon can promote the reproduction of soil beneficial microorganisms, the microbial metabolites can dissolve the fixed silicon, form a "release-fixation-releasing" cycle, achieve the slow-release effect, prolong the fertilizer efficiency, and reduce the fertilization frequency; the Bacillus subtilis produces antibacterial substances such as subtilin and polymyxin, thereby inhibiting the growth of soil pathogenic bacteria, and the silicon element can enhance the colonization ability of the disease-resistant bacteria, significantly improve the silicon absorption rate and the lodging resistance of crops. The jelly-like Paenibacillus and the Bacillus subtilis realize the functions of silicon activation, nutrient release and disease resistance promotion through synergistic effect.

[0027] As shown in Figure 1 A preparation process of a silicon-containing water-soluble fertilizer, comprising the following steps: S1. preparing raw materials: dissolving nano silicon dioxide with a particle size of 50-100 nm in deionized water to make the solid content 10%-20%, adding a silicate coupling agent and stirring for 3-4 hours at a temperature of 55-60 DEG C to prepare modified nano silicon dioxide; uniformly mixing silicate with 6%-10% citric acid at a mass ratio of 1:5-1:10, stirring for 1-2 hours, and centrifuging and filtering to obtain modified silicate. S2. uniformly mixing modified methyltrisiloxane organosilicon and modified nano silicon dioxide, stirring for 2-2.5 hours at a temperature of 55-60 DEG C. S3. adding a chelating agent, modified silicate, deionized water and a microbial compound inoculant, stirring and dissolving, uniformly mixing, adding a humic acid-humic acid compound to adjust pH, and obtaining a water-soluble fertilizer.

[0028] The raw materials used in the application are all commercially available raw materials.

[0029] Example 1:

[0030] A preparation process of a silicon-containing water-soluble fertilizer, comprising the following steps:

[0031] S1. preparing raw materials: dissolving nano silicon dioxide with a particle size of 50 nm in deionized water to make the solid content 10%, adding a silicate coupling agent with a mass fraction of 1% of nano silicon dioxide, stirring for 3 hours at a temperature of 55 DEG C to prepare modified nano silicon dioxide; uniformly mixing silicate (calcium silicate and magnesium silicate are composed according to a mass ratio of 1:1) with 6% citric acid at a mass ratio of 1:5, stirring for 1 hour, and centrifuging and filtering to obtain modified silicate, and the centrifugal speed is 3000 rpm.

[0032] S2. uniformly mixing 1 part by weight of modified methyltrisiloxane organosilicon and 15 parts by weight of modified nano silicon dioxide, stirring for 2 hours at a temperature of 55 DEG C to obtain a modified mixed solution;

[0033] S3. To the modified mixture, add 3 parts by weight of chelating agent EDTA to chelate zinc, 13 parts by weight of modified silicate, 60 parts by weight of deionized water, and 3 parts by weight of microbial complexing agent (consisting of Paenibacillus mucilaginosus and Bacillus subtilis in a mass ratio of 1:1), stir and dissolve, mix uniformly, then add humic acid-fulvic acid complex (consisting of potassium humate and fulvic acid in a mass ratio of 3:1) to adjust the pH to 7.1, and obtain a water-soluble fertilizer.

[0034] Example Two:

[0035] A preparation process of a silicon-containing water-soluble fertilizer, comprising the following steps:

[0036] S1. Prepare raw materials: dissolve nano-silicon dioxide with a particle size of 100 nm in deionized water to make its solid content 20%, add a silicate coupling agent with a mass fraction of 5% of nano-silicon dioxide, stir and react for 4 hours at a temperature of 60°C, to obtain modified nano-silicon dioxide; uniformly mix calcium silicate and citric acid with a concentration of 10% at a mass ratio of 1:10, stir for 2 hours, centrifuge and filter to obtain modified silicate, and the centrifugal speed is 4000 rpm.

[0037] S2. Mix 3 parts by weight of modified methyltrisiloxane organosilicon with 45 parts by weight of modified nano-silicon dioxide, stir and react for 2.5 hours at a temperature of 60°C, to obtain a modified mixture.

[0038] S3. To the modified mixture, add 3 parts by weight of chelating agent EDTA to chelate zinc, 13 parts by weight of modified silicate, 60 parts by weight of deionized water, and 3 parts by weight of microbial complexing agent (consisting of Paenibacillus mucilaginosus and Bacillus subtilis in a mass ratio of 1:1), stir and dissolve, mix uniformly, then add humic acid-fulvic acid complex (consisting of potassium humate and fulvic acid in a mass ratio of 3:1) to adjust the pH to 7.1, and obtain a water-soluble fertilizer.

[0039] Example Three:

[0040] A preparation process of a silicon-containing water-soluble fertilizer, comprising the following steps:

[0041] S1. Prepare raw materials: dissolve nano-silicon dioxide with a particle size of 80 nm in deionized water to make its solid content 15%, add a silicate coupling agent with a mass fraction of 2.5% of nano-silicon dioxide, stir and react for 3.5 hours at a temperature of 57°C, to obtain modified nano-silicon dioxide; uniformly mix magnesium silicate and citric acid with a concentration of 8% at a mass ratio of 1:7, stir for 1.5 hours, centrifuge and filter to obtain modified silicate, and the centrifugal speed is 3500 rpm.

[0042] S2. 2 parts by weight of modified methyltrisiloxane silicone 2 and 30 parts by weight of modified nanosilica were mixed uniformly, stirred and reacted for 2.5 hours at a temperature of 60°C to obtain a modified mixture.

[0043] S3. 2 parts by weight of chelating agent (EDTA chelated boron and EDTA chelated zinc in a mass ratio of 1:1), 12 parts by weight of modified silicate, 55 parts by weight of deionized water and 2.5 parts by weight of microbial composite inoculant (Bacillus pumilus and Bacillus subtilis in a mass ratio of 1:1) were added to the modified mixture, stirred and dissolved, and then mixed uniformly. Humic acid-xanthic acid compound (potassium humate and xanthic acid in a mass ratio of 3:1) was added to adjust the pH to 6.9 to obtain a water-soluble fertilizer.

[0044] Comparative Example 1:

[0045] The difference from Example 1 is that the modified nanosilica is removed.

[0046] Comparative Example 2:

[0047] The difference from Example 1 is that the silicate is not modified but directly added.

[0048] Comparative Example 3:

[0049] The difference from Example 1 is that the microbial composite inoculant is removed.

[0050] Comparative Example 4:

[0051] The difference from Example 1 is that the nanosilica is not modified but directly added.

[0052] Comparative Example 5:

[0053] The difference from Example 1 is that the modified silicate is removed.

[0054] The water-soluble fertilizers produced in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 and 5 were tested for performance.

[0055] The water-soluble fertilizers produced in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 and 5 were tested for performance.

[0056] Table 1: Quality indicators of water-soluble fertilizers

[0057]

[0058] As shown in Table 1, the silicon content in the fertilizer is significantly improved by adding modified nano-silicon dioxide and modified silicate, and the content meets the quality index of liquid product of "medium element fertilizer"; the modified silicate avoids the problem of seedling burning caused by excessive alkalinity of traditional silicate, and the mild organic acid treatment of silicate is environmentally friendly and can promote plant absorption, while destroying the crystal structure of silicate, converting insoluble silicon into soluble silicon, rapidly increasing the content of soluble silicon, enhancing its stability in soil, and reducing loss; the silicon content of modified nano-silicon dioxide may be lower than that of traditional silicon fertilizer, but the cost of the fertilizer is reduced, and the utilization rate of silicon element is improved through its slow-release and synergistic effect, and the dispersibility is significantly improved, solving the problem of agglomeration, and the modified nano-silicon dioxide can also be used as a carrier for silicon element to adsorb silicate ions, slowly release, and extend the fertilizer effect. The modified nano-silicon dioxide can also carry silicon elements to the growth point of plants to promote cell wall silicification and enhance the resistance to lodging. The combination of modified nano-silicon dioxide and modified silicate can quickly supplement silicon nutrition for crops, optimize the soil environment, promote root growth, improve the absorption efficiency of silicon by crops, reduce nutrient loss, and achieve efficient use of fertilizers.

[0059] The water-soluble fertilizers produced in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 and 5 were used to treat strawberry seedlings, and drip irrigation was performed every three days. Eight treatment groups were divided, and the control group was drip irrigated with calcium silicate. After the strawberry cultivation survived, the water-soluble fertilizers were drip irrigated once at the initial flowering stage, the initial fruiting stage and the fruiting stage, and the dosage was 4-5 kg / mu. After the strawberry matured, the yield increase rate (compared with the control group), the increase rate of average silicon content in strawberry fruit (compared with the control group), the cracking rate and the pulp rot rate of the strawberry were tested, and the experimental results are shown in Table 2.

[0060] Table 2: Effect of silicon-containing fertilizer on related indexes of strawberry fruit

[0061]

[0062] As can be seen from Table 2, after the water-soluble fertilizers prepared in the examples and comparative examples were applied to strawberries, the silicon content in the strawberries applied with Examples 1, 2 and 3 was significantly increased, the yield was greatly improved, and the cracking and pulp rot rates of the harvested strawberry fruit were significantly reduced. The silicon content increase rate in the strawberries applied with Comparative Examples 1, 2, 3, 4 and 5 was less than that of the examples, the yield increase rate was also lower, and the cracking and pulp rot rates of the strawberry fruit were also higher.

[0063] The nanometer scale of the modified nanometer silicon dioxide enables it to be more efficiently absorbed by crop roots, and the surface active groups obtained after modification can enhance the interaction with root cells, promote the active absorption of silicon elements, and the synergistic effect of the modified nanometer silicon dioxide and modified silicate can further optimize the release and absorption process of silicon elements, thereby increasing the silicon content in strawberry plants, and then improving the fruit setting rate and fruit formation rate of strawberries, increasing the number of fruits per plant, thereby significantly improving the yield, and the siliconized cells formed by silicon elements in strawberries can hinder the invasion of pathogenic bacteria and pests, and induce crops to produce disease resistance-related enzymes, thereby improving their disease resistance. Paenibacillus mucilaginosus, as a silicate bacterium, can decompose silicate minerals in the soil to release soluble silicon elements, and the organic acids produced by its metabolism can destroy the mineral lattice structure, so that the silicon elements are released from the minerals and converted into a form available to plants; Bacillus subtilis has nitrogen fixation function, can fix nitrogen in the air into ammonium nitrogen, and at the same time secretes auxin and cytokinin to promote crop root development and nutrient absorption, and the antibiotics and antibacterial peptides and other substances secreted by the two can inhibit the growth of pathogenic bacteria in the soil, induce crops to produce resistance, and promote growth and disease resistance.

[0064] In summary, the water-soluble fertilizer produced by the present application has high silicon content, anti-precipitation, long fertilizer effect, promotes plant growth, and improves crop yield.

[0065] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited thereto. Any simple change, equivalent replacement or modification made on the basis of the present application to solve the same technical problem and achieve the same technical effect is also covered by the protection scope of the present application.

Claims

1. A water-soluble silicon-containing fertilizer, characterized by, The components include the following weight parts: Modified nano-silica 15-45 parts, humic acid-fulvic acid complex 10-15 parts, chelating agent 1-3 parts, modified methyltrisiloxane silicone 1-3 parts, modified silicate 10-13 parts, microbial complex inoculant 2-3 parts, and deionized water 50-60 parts.

2. The preparation process of the silicon-containing water-soluble fertilizer according to claim 1, wherein the process steps are: S1. Preparation of raw materials: nano-silica with a particle size of 50-100 nm is dissolved in deionized water to make the solid content 10%-20%, and a silicate coupling agent is added for stirring and reaction for 3-4 hours at a temperature of 55-60 DEG C to prepare modified nano-silica; silicate and citric acid with a concentration of 6%-10% are uniformly mixed at a mass ratio of 1:5-1:10, and then stirred for 1-2 hours, and centrifuged and filtered to obtain modified silicate; S2. Modified methyltrisiloxane silicone is uniformly mixed with modified nano-silica, and stirred and reacted for 2-2.5 hours at a temperature of 55-60 DEG C to obtain a modified mixture; S3. Chelating agent, modified silicate, deionized water and microbial complex inoculant are added to the modified mixture, stirred and dissolved, and then uniformly mixed, and humic acid-fulvic acid complex is added to adjust the pH to obtain a water-soluble fertilizer.

3. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The silicate coupling agent is one or both of ethyl silicate and propyl silicate, and the addition amount of the silicate coupling agent is 1%-5% of the mass of nano-silica.

4. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The silicate is one or both of calcium silicate and magnesium silicate.

5. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The centrifugal rotation speed is 3000-4000 rpm.

6. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The modified methyltrisiloxane and the modified nano-silica are mixed at a weight ratio of 1:

15.

7. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The microbial complex inoculant is composed of gelatin-like Paenibacillus and Bacillus subtilis at a mass ratio of 1:

1.

8. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The chelating agent is one or both of EDTA chelated boron and EDTA chelated zinc.

9. The process for preparing a silicon-containing water-soluble fertilizer according to claim 2, characterized by, The humic acid-fulvic acid complex is composed of potassium humate and fulvic acid at a mass ratio of 3:1 The pH is adjusted to 6.7-7.1.

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