Highly moist rice foliar fertilizer and preparation method thereof

Abstract

The present invention belongs to the technical field of agricultural functional additives and foliar fertilizers, and specifically relates to a highly wettable rice foliar fertilizer and a preparation method thereof. The highly wettable rice foliar fertilizer comprises a base foliar fertilizer and a surfactant, wherein the surfactant is an organosilicon polyether compound or a fluorine-containing organosilicon polyether compound. The present invention adds a specific surfactant to a conventional foliar fertilizer to form a stable solution without affecting the original stability of the foliar fertilizer. At the same time, the contact angle of the foliar fertilizer on the rice leaves is greatly reduced. Even after being diluted to 500 times, the contact angle is still less than 90°, allowing the foliar fertilizer to better wet the rice leaves and not easily slide off, thereby improving the rice's absorption of the foliar fertilizer.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural functional adjuvants and foliar fertilizers, and particularly relates to a high-wetting rice foliar fertilizer and a preparation method thereof. Background Art

[0002] The research and application of rice foliar fertilizers has a history of over 200 years, and its development can be divided into several stages. As early as the 18th century, foliar application of rice using primitive materials such as river mud and manure was already being used. From the 1940s to the 1960s, foliar fertilizer application began to be used in large-scale agricultural production, primarily by spraying crops with urea and wood ash extracts to promote growth and increase yields. In the early 1960s, various types of commercial foliar fertilizers appeared in Japan and Western Europe. Chelating agents were added to single fertilizer formulas to increase the concentration of foliar fertilizers, and foliar fertilizers containing chelated trace elements as their primary ingredients were developed.

[0003] Leaves are one of the most important nutritional organs of plants. The nutrient absorption patterns and mechanisms of leaves conform to the five principles of fertilization: the nutrient return theory, the law of minimum nutrient availability, the law of optimal factors, the rate of diminishing returns, and the rate of combined effects. A solution sprayed on the leaf surface first wets the solid surface, then diffuses into the leaf, ultimately reaching the cells to take effect. Experiments have shown that the proportion of nutrients remaining on the leaf surface relative to the original content is exponentially related to the time of penetration.

[0004] There are many types of foliar fertilizers, which are generally divided into nutritional, regulatory, biological, fertilizer-pesticide, and compound types based on their functions and ingredients. Nutritional foliar fertilizers mainly provide nitrogen, phosphorus, potassium, and trace elements. Regulatory foliar fertilizers contain growth regulators. Biological foliar fertilizers contain microorganisms and their metabolites. Fertilizer-pesticide foliar fertilizers combine pesticide ingredients. Compound foliar fertilizers combine multiple functions.

[0005] The effects of foliar fertilizer on rice are primarily reflected in increasing yield, improving quality, and reducing heavy metal accumulation. For example, foliar fertilizer can increase rice yield by increasing yield components such as the number of effective panicles, number of grains per panicle, and 1000-grain weight. Furthermore, foliar fertilizer can improve rice quality by reducing the chalkiness and chalkiness of grains, increasing the polished and brown rice rates, and boosting amylose and protein content. Regarding reducing heavy metal accumulation, foliar fertilizer, such as by spraying heavy metal chelators, can significantly reduce cadmium accumulation in the aboveground parts of rice seedlings.

[0006] Issues with foliar fertilizer application include time-consuming and labor-intensive application methods, a limited variety of fertilizers, and inconsistent results. Future development strategies and trends include mechanized fertilization, diversified fertilizers, lower costs, and environmentally friendly materials. With technological advancements, foliar fertilizer application will become more efficient and environmentally friendly, contributing to the comprehensive goals of high rice yield, high quality, high efficiency, ecological sustainability, and safety.

[0007] However, existing basic foliar fertilizers generally cannot contact the rice leaves well, thereby affecting the rice's absorption of the foliar fertilizer. How to make the foliar fertilizer contact and wet the rice leaves better is a technical problem that those skilled in the art need to solve.

[0008] Improving the wetting and spreading of foliar fertilizers by adding surfactants is a viable technical approach. Currently, there are tens of thousands of surfactants, classified according to their chemical structure, properties, and uses. These surfactants are generally categorized based on the structure of their hydrophilic groups, namely, cationic, anionic, amphoteric, nonionic, and silicone oil surfactants. Selecting or preparing the appropriate surfactant based on the characteristics of the base foliar fertilizer to achieve optimal contact wetting and maintain good stability remains a technical challenge that needs further investigation. Summary of the Invention

[0009] In order to improve the contact wetting of foliar fertilizer on rice leaves, the main purpose of the present invention is to provide a high-wetting rice foliar fertilizer and a preparation method thereof.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A high-wetting rice foliar fertilizer comprises a basic foliar fertilizer and a surfactant, wherein the surfactant is an organosilicon polyether compound or a fluorine-containing organosilicon polyether compound.

[0012] Preferably, the mass of the surfactant is 0.5-5% of the mass of the basic foliar fertilizer.

[0013] Preferably, the organosilicon polyether compound is an organosilicon polyoxyethylene ether compound, which is a commonly used agricultural organosilicon synergist with low surface tension, good spreading, permeability and emulsification and dispersibility.

[0014] Preferably, the fluorinated organosilicon polyether compound is prepared by the following method:

[0015] Hydroxyfluorosilicone oil is reacted with diisocyanate to obtain isocyanate-terminated fluorinated silicone oil, which is then reacted with polyethylene glycol to obtain a polyether-terminated fluorinated organosilicon polyether compound.

[0016] Preferably, the hydroxyfluorosilicone oil is a raw material that can be purchased on the market, which is an oligomer obtained by ring-opening reaction of trifluoropropylmethylcyclotrisiloxane (D3F); the viscosity of the hydroxyfluorosilicone oil preferably ranges from 50 to 100 mPa·s and the average molecular weight ranges from 3000 to 8000.

[0017] Preferably, the diisocyanate is any one of hexamethylene diisocyanate, toluene diisocyanate, p-phenylene diisocyanate, isophorone diisocyanate, and diphenylmethane diisocyanate.

[0018] Preferably, the molar ratio of the hydroxy fluorosilicone oil to the diisocyanate is 1:2 to 2.2. By using an excess of diisocyanate to react, the terminal groups of the intermediate product are isocyanate groups.

[0019] Preferably, the reaction between the hydroxyfluorosilicone oil and the diisocyanate is carried out in an organic solvent, wherein the organic solvent is any one of toluene, N-methylpyrrolidone, and N,N-dimethylformamide. The use of such an organic solvent can better promote the miscibility and reaction of the reactants. The diisocyanate reaction temperature is 40-60°C, and the reaction time is 6-20 hours.

[0020] Preferably, the average molecular weight of the polyethylene glycol is 1000-2000, and the molar ratio of polyethylene glycol to hydroxyfluorosilicone oil is 2-2.5:1. Using an excess of polyethylene glycol results in a final product primarily consisting of an oligomer structure with a fluorinated polysiloxane chain in the middle and polyether chains at both ends, which plays a key role in improving the wettability and stability of rice foliar fertilizers. The polyethylene glycol reaction temperature is 60-100°C, and the reaction time is 6-20 hours.

[0021] Preferably, the basic foliar fertilizer adopts amino acid water-soluble fertilizer, silicon-containing water-soluble fertilizer, organic water-soluble fertilizer or trace element water-soluble fertilizer commonly used in the market. As an example, the composition ratio of the amino acid water-soluble fertilizer is any one of the following (1) or (2):

[0022] (1) Glycine 8-15%, chelated manganese 1-2%, chelated zinc 10-15%, boric acid 0.2-0.5%, sorbitol 1-3%, balance water;

[0023] (2) Glycine 8-15%, calcium nitrate tetrahydrate 10-20%, magnesium nitrate hexahydrate 5-10%, alkyl glycoside 0.5-2%, and the balance water;

[0024] The composition ratio of the silicon-containing water-soluble fertilizer is: 60-85% potassium silicate and the balance is water;

[0025] The organic water-soluble fertilizer comprises the following ingredients: 0.05-0.2% sodium molybdate, 5-10% potassium dihydrogen phosphate, 15-25% monoammonium phosphate, 0.5-2% urea, 10-20% glycolipid, 0.1-0.5% boric acid, 10-25% chelated zinc, 0.2-0.5% chelated manganese, 0.2-0.5% chelated copper, 0.5-2% citric acid, 0.1-0.5% alkyl glycoside, and the balance is water.

[0026] The composition ratio of the trace element water-soluble fertilizer is: 20-30% boric acid, 5-15% ammonium nitrogen fertilizer (ammonium sulfate, ammonium chloride, ammonium bicarbonate, etc.), 20-35% chelated zinc, 1-2% chelated iron, 1-2% chelated copper, 1-2% chelated manganese, 0.1-1% sodium molybdate, 0.1-0.2% alkyl glycoside, 1-5% ethylene glycol, 2-5% citric acid, and the balance is water.

[0027] The method for preparing the highly moist rice foliar fertilizer comprises the following steps:

[0028] The surfactant is added to the basic foliar fertilizer, stirred and mixed to dissolve, so as to obtain a highly moist rice foliar fertilizer.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention adds a specific surfactant to conventional foliar fertilizer to form a stable solution without affecting the original stability of the foliar fertilizer. At the same time, the contact angle of the foliar fertilizer on the rice leaves is greatly reduced. Even if it is diluted to 500 times, the contact angle is still less than 90 degrees, so that the foliar fertilizer is better wetted on the rice leaves and is not easy to slide off, thereby improving the rice's absorption of the foliar fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Figure 2 shows the contact angle measuring device used in an embodiment of the present invention (left) and the effect of foliar fertilizer drops on rice leaves (right).

[0032] Figure 2 Graph showing the storage stability test results of the trace element water-soluble fertilizer obtained in Example 1.

[0033] Figures 3 to 7 The contact angle test results of five foliar fertilizers without fluorinated silicone polyether compounds (top) and five improved foliar fertilizers (bottom) on rice leaves.

[0034] Figure 8 This is a graph showing the storage stability test results of the trace element water-soluble fertilizer obtained in Example 2.

[0035] Figure 9 This is a graph showing the storage stability test results of the silicon-containing water-soluble fertilizer obtained in Comparative Example 2. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0037] The basic foliar fertilizer formula used in the following examples is as shown in Table 1:

[0038] Table 1

[0039]

[0040]

[0041] Example 1

[0042] The basic foliar fertilizer formula in Table 1 was scaled down 10-fold to prepare 111.8 g of amino acid (trace) water-soluble fertilizer stock solution, 122 g of amino acid (medium) water-soluble fertilizer stock solution, 100 g of silicon-containing water-soluble fertilizer stock solution, 130 g of organic water-soluble fertilizer stock solution, and 132 g of trace element water-soluble fertilizer stock solution. Then, 1% of an organosilicon polyoxyethylene ether compound (agricultural organosilicon synergist RH-SE258, Zhejiang Runhe Organosilicon New Materials Co., Ltd., with a polyether chain located on the polysiloxane side chain) was added to each solution. The mixture was heated and stirred at 40°C for 30 minutes. After cooling for 24 hours, the five foliar fertilizer solutions remained clear and transparent. Contact angle tests were conducted on the five improved foliar fertilizers. The contact angle measuring device used (left) and the effect of dropping the foliar fertilizer on rice leaves (right) are shown. Figure 1 The contact angles of undiluted amino acid (trace) water-soluble fertilizer and its 100-fold and 500-fold dilutions were 0°, 17°, and 79°, respectively; the contact angles of undiluted amino acid (medium) water-soluble fertilizer and its 100-fold and 500-fold dilutions were 0°, 0°, and 35°, respectively; the contact angles of undiluted organic water-soluble fertilizer and its 100-fold and 500-fold dilutions were 0°, 23°, and 90°, respectively; the contact angles of undiluted silicon-containing water-soluble fertilizer and its 100-fold and 500-fold dilutions were 12°, 47°, and 83°, respectively; the contact angles of undiluted trace element water-soluble fertilizer and its 100-fold and 500-fold dilutions were 0°, 82°, and 96°, respectively.

[0043] The storage stability of the five improved foliar fertilizers was tested: the foliar fertilizers were observed after being stored at room temperature (7℃~37℃) for 6 months. The results showed that the amino acid (trace) water-soluble fertilizer stock solution, amino acid (medium) water-soluble fertilizer, silicon-containing water-soluble fertilizer and organic water-soluble fertilizer remained clear and transparent, while the trace element water-soluble fertilizer had a golden oily substance sticking to the wall and crystals precipitated at the bottom of the bottle (such as Figure 2 shown). Example 2

[0044] (1) Preparation of fluorosilicone polyether compound: Hydroxyfluorosilicone oil (commercially available, D3F open-ring oligomer) with a viscosity of 60 mPa·s and an average molecular weight of 5000 and hexamethylene diisocyanate were added to a toluene solvent at a molar ratio of 1:2.1 and dissolved. The mixture was then heated to 50-55°C and allowed to react for 10 h. The hydroxyl content of the product was determined to be complete, and an isocyanate-terminated fluorosilicone oil was obtained. Polyethylene glycol with an average molecular weight of 1500 was then added at a molar ratio of 2.3:1 to the fluorosilicone oil. The mixture was heated to 70-75°C and allowed to react for 12 h. The isocyanate content of the product was determined to be complete, and the toluene solvent was removed under vacuum to recover the polyether-terminated fluorosilicone polyether compound. The average molecular weight of the product was determined to be 9100.

[0045] (2) According to the method of Example 1, amino acid (trace) water-soluble fertilizer stock solution, amino acid (medium) water-soluble fertilizer stock solution, silicon-containing water-soluble fertilizer stock solution, organic water-soluble fertilizer stock solution, and trace element water-soluble fertilizer stock solution were prepared respectively. Then, 1% of fluorine-containing organosilicon polyether compound was added to each of the solutions. The mixture was heated and stirred at 40°C for 30 minutes. After cooling for 24 hours, the five foliar fertilizer solutions remained clear and transparent. The contact angle tests were conducted on the five improved foliar fertilizers. The contact angles of the undiluted amino acid (trace) water-soluble fertilizer and the 100-fold and 500-fold diluted ones were 0°, 0°, and 48°, respectively; the contact angles of the undiluted amino acid (medium) water-soluble fertilizer and the 100-fold and 500-fold diluted ones were 0°, 0°, and 0°, respectively; the contact angles of the undiluted organic water-soluble fertilizer and the 100-fold and 500-fold diluted ones were 0°, 0°, and 26°, respectively; the contact angles of the undiluted silicon-containing water-soluble fertilizer and the 100-fold and 500-fold diluted ones were 0°, 27°, and 60°, respectively; the contact angles of the undiluted trace element water-soluble fertilizer and the 100-fold and 500-fold diluted ones were 0°, 0°, and 78°, respectively. The contact angle test results of the foliar fertilizer without fluorinated silicone polyether compounds (above) and the five improved foliar fertilizers (below) on rice leaves are shown as follows. Figures 3 to 7 shown.

[0046] The storage stability test of the five improved foliar fertilizers was conducted: the foliar fertilizers were observed after being stored at room temperature (7℃~37℃) for 6 months. The results showed that the amino acid (trace) water-soluble fertilizer concentrate, amino acid (medium) water-soluble fertilizer, silicon-containing water-soluble fertilizer, organic water-soluble fertilizer and trace element water-soluble fertilizer all remained clear and transparent. The appearance of the trace element water-soluble fertilizer after the stability test is as follows: Figure 8 shown.

[0047] The results of Examples 1 and 2 demonstrate that the present invention's use of organosilicon polyether compounds or fluorinated organosilicon polyether surfactants added to foliar fertilizers significantly reduces the wetting contact angle on rice leaves, thereby facilitating the absorption of foliar fertilizers by rice leaves. Furthermore, it was found that the specific fluorinated organosilicon polyether compounds of the present invention significantly reduced the wetting contact angle on rice leaves compared to organosilicon polyether compounds, with the contact angles for five foliar fertilizers diluted 500 times all below 90°. Furthermore, the specific fluorinated organosilicon polyether compounds of the present invention exhibited superior stability in water-soluble trace element fertilizers compared to organosilicon polyether compounds. Example 3

[0048] Compared with Example 2, in the preparation process of the fluorinated organosilicon polyether compound, the molar ratio of polyethylene glycol to hydroxyfluorosilicone oil was adjusted to 1.5:1, and the rest were the same.

[0049] Results showed that the average molecular weight of the fluorinated organosilicon polyether compound obtained at a molar ratio of polyethylene glycol to hydroxyfluorosilicone oil of 1.5:1 was 21,500. After heating, stirring, and cooling for 24 hours with a water-soluble fertilizer stock solution, the amino acid (trace) water-soluble fertilizer, amino acid (medium) water-soluble fertilizer, and organic water-soluble fertilizer remained clear and transparent, while precipitation and stratification occurred in the silicon-containing water-soluble fertilizer and trace element water-soluble fertilizer. Contact angle measurements were conducted on the three stable foliar fertilizers. The contact angles of the undiluted amino acid (trace) foliar fertilizer, 100-fold diluted, and 500-fold diluted solutions were 0°, 24°, and 80°, respectively; the contact angles of the undiluted amino acid (medium) foliar fertilizer, 100-fold diluted, and 500-fold diluted solutions were 0°, 0°, and 42°, respectively; and the contact angles of the undiluted organic foliar fertilizer, 100-fold diluted, and 500-fold diluted solutions were 0°, 21°, and 95°, respectively.

[0050] By comparing the results of this embodiment with those of Example 2, it can be seen that when the molar ratio of polyethylene glycol to hydroxyfluorosilicone oil is lower than 2:1, the degree of polymerization of the obtained fluorinated organosilicon polyether compound increases, and after addition, some foliar fertilizers become unstable and their wetting effect also deteriorates.

[0051] Comparative Example 1

[0052] According to the method in Example 1, amino acid (trace) water-soluble fertilizer stock solutions, amino acid (medium) water-soluble fertilizer stock solutions, silicon-containing water-soluble fertilizer stock solutions, organic water-soluble fertilizer stock solutions, and trace element water-soluble fertilizer stock solutions were prepared. Then, 1% of the nonionic surfactant fatty alcohol polyoxyethylene ether (AEO), 1% of the anionic surfactant sodium dodecylbenzenesulfonate (SDBS), and 1% of the cationic surfactant octadecyltrimethylammonium chloride (OTAC) were added, respectively. The mixture was heated at 40°C with stirring for 30 minutes. After cooling for 24 hours, the foliar fertilizers were unstable, with precipitation and stratification, or deposits on the cup walls. This indicates that the addition of conventional surfactants destabilized the foliar fertilizers. This is because conventional surfactants cause precipitation or agglomeration of metal salts in the foliar fertilizers. Subsequent dilution and contact angle testing were not performed.

[0053] It can be seen from the results of this comparative example that the use of conventional surfactants will lead to instability of foliar fertilizers.

[0054] Comparative Example 2

[0055] Following the method in Example 1, stock solutions of amino acid (trace) water-soluble fertilizer, amino acid (medium) water-soluble fertilizer, silicon-containing water-soluble fertilizer, organic water-soluble fertilizer, and trace element water-soluble fertilizer were prepared. Then, 1% of alkyl polyether-modified fluorosilicone oil (commercially available from Hubei Xinyuhong Biopharmaceutical Technology Co., Ltd., with polyether chains positioned on the side chains of fluoropolysiloxane) was added to each solution. The mixture was heated at 40°C with stirring for 30 minutes. After cooling for 24 hours, the solution was observed to ensure clarity. The results showed that the amino acid (trace) water-soluble fertilizer, amino acid (medium) water-soluble fertilizer, silicon-containing water-soluble fertilizer, and organic water-soluble fertilizer remained clear and transparent, while precipitation and stratification occurred in the trace element water-soluble fertilizer. Contact angle measurements were then performed on the four stable foliar fertilizers. The contact angles of undiluted amino acid (trace) foliar fertilizer and its diluted 100 times and 500 times were 0°, 86°, and 92°, respectively; the contact angles of undiluted amino acid (medium) foliar fertilizer and its diluted 100 times and 500 times were 0°, 117°, and 123°, respectively; the contact angles of undiluted organic foliar fertilizer and its diluted 100 times and 500 times were 0°, 108°, and 111°, respectively; the contact angles of undiluted silicon-containing foliar fertilizer and its diluted 100 times and 500 times were 57°, 80°, and 110°, respectively.

[0056] The storage stability test was conducted on 4 kinds of stable foliar fertilizers: the foliar fertilizers were observed after being stored at room temperature (7℃~37℃) for 6 months. The results showed that amino acid (trace) water-soluble fertilizer, amino acid (medium) water-soluble fertilizer and organic water-soluble fertilizer all remained clear and transparent, but the silicon-containing water-soluble fertilizer had a shallow oil layer on the liquid surface (insoluble stratification, but it did not affect the state of the silicon fertilizer liquid in the system, such as Figure 9 shown).

[0057] The results of this comparative example show that the addition of alkyl polyether-modified fluorosilicone oils with different structures can reduce the contact angle, but dilution to 500 times does not achieve the desired effect. It also has an adverse effect on the stability of the trace element water-soluble fertilizer. Furthermore, precipitation occurs during storage of silicon-containing water-soluble fertilizers, which reduces their effectiveness. This may be due to the strong hydrophobicity and weak hydrophilicity of alkyl polyether-modified fluorosilicone oils, which reduces their compatibility and stability with the silicon-containing water-soluble fertilizers.

[0058] Comparative Example 3

[0059] Compared with Example 2, this comparative example is prepared by the following method:

[0060] Polyethylene glycol (1500 average molecular weight) and hexamethylene diisocyanate (1:2.1 molar ratio) were added to toluene solvent and dissolved. The mixture was then heated to 50-55°C and allowed to react for 10 hours. The hydroxyl content of the product was determined to be complete, yielding an isocyanate-terminated polyether. Hydroxyfluorosilicone oil (commercially available, D3F ring-opening oligomer) with a viscosity of 60 mPa·s and an average molecular weight of 5000 was then added. The molar ratio of hydroxyfluorosilicone oil to polyethylene glycol was 2.3:1. The mixture was heated to 70-75°C and allowed to react for 12 hours. The isocyanate content of the product was determined to be complete, yielding a polysiloxane-terminated fluorinated organosilicon polyether compound. The product had an average molecular weight of 11,300.

[0061] Following the method in Example 1, separate solutions of amino acid (trace) water-soluble fertilizer, amino acid (medium) water-soluble fertilizer, silicon-containing water-soluble fertilizer, organic water-soluble fertilizer, and trace element water-soluble fertilizer were prepared. 1% of a fluorinated organosilicon polyether compound was then added to each solution. The mixture was heated at 40°C with stirring for 30 minutes. After cooling for 24 hours, a shallow oil layer appeared on the surface of the foliar fertilizers. Subsequent dilution and contact angle testing were not performed.

[0062] This comparative example further demonstrates that the compatibility of fluorinated organosilicon polyether compounds with different structures in foliar fertilizers varies significantly. The oligomer structure of the present invention, comprising a hydrophobic fluorinated polysiloxane chain in the middle and hydrophilic polyether chains at both ends, exhibits good compatibility with water-soluble fertilizers and significantly improves the wettability of rice foliar fertilizers.

[0063] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A highly moist rice foliar fertilizer, comprising a basic foliar fertilizer and a surfactant, characterized in that: The surfactant is a fluorine-containing organosilicon polyether compound; The preparation method of the fluorine-containing organosilicon polyether compound is as follows: The hydroxy fluorosilicone oil is reacted with diisocyanate to obtain an isocyanate-terminated fluorosilicone oil, and the isocyanate-terminated fluorosilicone oil is then reacted with polyethylene glycol to obtain a polyether-terminated fluoroorganosilicon polyether compound; The molar ratio of the reaction of the hydroxy fluorosilicone oil and the diisocyanate is 1:2-2.2, and the molar ratio of the polyethylene glycol and the hydroxy fluorosilicone oil is 2-2.5:

1.

2. The highly moist rice foliar fertilizer according to claim 1, characterized in that: The mass of the surfactant is 0.5-5% of the mass of the basic foliar fertilizer.

3. The highly moist rice foliar fertilizer according to claim 1, characterized in that: The viscosity of the hydroxy fluorosilicone oil is 50-100 mPa·s, and the average molecular weight is 3000-8000; the diisocyanate is any one of hexamethylene diisocyanate, toluene diisocyanate, p-phenylene diisocyanate, isophorone diisocyanate, and diphenylmethane diisocyanate.

4. The highly moist rice foliar fertilizer according to claim 1, characterized in that: The reaction of the hydroxy fluorosilicone oil and the diisocyanate is carried out under an organic solvent condition, wherein the organic solvent is any one of toluene, N-methylpyrrolidone, and N,N-dimethylformamide; the temperature of the diisocyanate reaction is 40-60° C., and the reaction time is 6-20 hours.

5. The highly moist rice foliar fertilizer according to claim 1, characterized in that: The average molecular weight of the polyethylene glycol is 1000-2000; the reaction temperature of the polyethylene glycol is 60-100° C., and the reaction time is 6-20 hours.

6. The highly moist rice foliar fertilizer according to claim 1, characterized in that: The basic foliage fertilizer is amino acid water-soluble fertilizer, silicon-containing water-soluble fertilizer, organic water-soluble fertilizer or trace element water-soluble fertilizer.

7. The method for preparing a highly moist rice foliar fertilizer according to any one of claims 1 to 6, characterized in that: The steps include: The surfactant is added to the basic foliar fertilizer, stirred and mixed to dissolve, so as to obtain a highly moist rice foliar fertilizer.

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