Multifunctional water-soluble fertilizer containing S-propenylglucosinolate and wetting penetrant and its preparation method

Abstract

The application discloses a multifunctional water-soluble fertilizer containing S-propionyl dunnianol and wetting penetrant and a preparation method thereof, and relates to the technical field of agricultural fertilizers.The multifunctional water-soluble fertilizer containing S-propionyl dunnianol and wetting penetrant comprises the following components in a mass ratio: S-propionyl dunnianol, 0.01-0.05 parts; wetting penetrant, 0.5-3 parts; macroelement fertilizer, 30-35 parts; medium element fertilizer, 1-5 parts; trace element fertilizer, 0.05-0.1 part; dispersing agent, 5-10 parts; antioxidant, 0.5-1 part; and water, 40-50 parts.The S-propionyl dunnianol and the wetting penetrant are synergistically used to enhance the resistance of plants to diseases, reduce the disease infection rate and improve the overall health level of the plants.The specific antioxidant is used in combination with an optimized preparation process, so that the fertilizer is not prone to precipitation, delamination and other phenomena during storage, and the long-term stability of the fertilizer is ensured.

Description

Technical Field

[0001] This invention relates to the field of agricultural fertilizer technology, specifically to a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent, and its preparation method. Background Technology

[0002] Water-soluble fertilizers, as a new type of environmentally friendly fertilizer, are characterized by high nutrient content, convenient application, and rapid fertilizer effect, effectively solving problems such as single nutrient content, low utilization rate, and environmental pollution associated with traditional fertilizers. In recent years, with the development of agricultural modernization and the increasing demands for agricultural product quality, the market demand for water-soluble fertilizers has been growing. However, existing water-soluble fertilizers still have some shortcomings, limiting their further development and application.

[0003] First, most water-soluble fertilizers primarily focus on providing the macro-, meso-, and micro-elements required for plant growth, neglecting the addition of plant growth regulators, which play a crucial role in regulating plant growth and development. Plant growth regulators can regulate plant physiological metabolic processes, promote root growth, enhance photosynthesis, and improve stress resistance. However, currently available water-soluble fertilizers contain relatively few types and amounts of plant growth regulators, failing to fully realize their potential. Second, the application of wetting and penetrating agents in water-soluble fertilizers also has limitations. Wetting and penetrating agents can reduce the surface tension of fertilizer solutions, enhancing their adhesion to soil and plant surfaces, and improving the utilization rate of fertilizers with limited nutrient content and low utilization efficiency. Traditional water-soluble fertilizers often use chemically synthesized surfactants, which have drawbacks such as poor biodegradability and some environmental pollution. Finally, existing water-soluble fertilizer formulations and preparation processes are relatively complex and costly, limiting their large-scale production and widespread application.

[0004] Therefore, developing a multifunctional water-soluble fertilizer that can provide comprehensive nutrition, contains highly efficient plant growth regulators, and has good wetting and penetration properties is of great practical significance for improving fertilizer utilization, promoting plant growth, increasing crop yield, and improving quality. Summary of the Invention

[0005] The purpose of this invention is to address the problems of existing water-soluble fertilizers, such as single nutrient composition, low utilization rate, and complex processing, by providing a multifunctional water-soluble fertilizer containing S-propionylbenzene lactone and a wetting and penetrating agent, as well as its preparation method. This fertilizer, through the addition of plant growth regulators and environmentally friendly wetting and penetrating agents, effectively promotes crop growth, enhances plant stress resistance, and increases crop yield.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent, wherein the fertilizer includes S-propionyl benzyl lactone; the S-propionyl benzyl lactone is a compound represented by Formula 1;

[0008] Equation 1 is... ;

[0009] The preparation method of the S-propionyl stigmasterol is as follows: (1) sulfonation of stigmasterol to prepare (22E,23R,24S)-3α-methanesulfonyl-5,22-diene-stigmasterol (compound B); (2) cyclization of sterol sulfonate to obtain 6-hydroxysterol (compound C); (3) oxidation of 6-hydroxysterol to obtain 6-sterone (compound D); (4) oxidation of 6-sterone to diene product (compound E); (5) dihydroxylation to prepare 2α,3α-dihydroxy-5α-cholest-22-en-6-one (compound T); (6) dipropionylation to prepare (22R,23R,24S)-2α,3α-dipropionyloxy-5α-cholest-22-en-6-one (compound P); (7) epoxidation and oxidative rearrangement to prepare S-propionyl stigmasterol.

[0010] Furthermore, the fertilizer comprises the following components in the indicated mass ratios: S-propionyl lactone: 0.01-0.05 parts, wetting and penetrating agent: 0.5-3 parts, macronutrient fertilizer: 30-35 parts, mesonutrient fertilizer: 1-5 parts, micronutrient fertilizer: 0.05-0.1 parts, dispersant: 5-10 parts, antioxidant: 0.5-1 part, and water: 40-50 parts.

[0011] The antioxidant is the compound described in Formula 2:

[0012] Equation 2 is ;

[0013] In Formula 2, R1 is a substituent, wherein R1 is selected from alkyl or phenyl groups having 1-5 carbon atoms.

[0014] Furthermore, the wetting and penetrating agent is selected from at least one of lauryl alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate.

[0015] Furthermore, the macro-element fertilizer is composed of nitrogen, phosphorus, and potassium sources;

[0016] The nitrogen source is selected from at least one of ammonium nitrate and urea;

[0017] The phosphorus source is selected from at least one of monoammonium phosphate and ammonium polyphosphate;

[0018] The potassium source is selected from at least one of potassium nitrate and potassium dihydrogen phosphate;

[0019] The mass ratio of the nitrogen source, phosphorus source and potassium source is (1-3):1:1.

[0020] Furthermore, the medium-element fertilizer is composed of calcium, magnesium, and sulfur sources;

[0021] The calcium source is selected from at least one of calcium nitrate and calcium chloride;

[0022] The magnesium source is selected from at least one of magnesium nitrate and magnesium sulfate;

[0023] The sulfur source is selected from at least one of ammonium sulfate and potassium sulfate;

[0024] The mass ratio of the calcium source, magnesium source and sulfur source is (2-6):(0.5-2):(0.5-3).

[0025] Furthermore, the micronutrient fertilizer is composed of EDTA chelated iron, EDTA chelated zinc, EDTA chelated manganese, EDTA chelated copper, EDTA chelated molybdenum, and EDTA chelated boron in a mass ratio of (4-6):(1-3):(1-3):(0.5-1):(0.2-0.5):(0.1-0.5).

[0026] Furthermore, the dispersant is selected from at least one of calcium lignosulfonate, sodium lignosulfonate, and sodium carboxymethyl cellulose.

[0027] Furthermore, the antioxidant is any one of the compounds shown in the following structures:

[0028] ;

[0029] .

[0030] A method for preparing a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent includes the following steps:

[0031] S1. Dissolve the macro-element fertilizer, medium-element fertilizer, micro-element fertilizer and antioxidant in water at 50-60℃ and stir to form a mother liquor;

[0032] S2. Add the wetting and penetrating agent and dispersant to the mother liquor, stir and mix to obtain mixture A;

[0033] S3. The S-propionyl lactone is pre-dissolved in acetone to prepare a solution with a mass concentration of 0.01%-0.05%, which is then added to the mixture A and stirred to obtain mixture B;

[0034] S4. Filter and package to obtain a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent.

[0035] Furthermore, in steps S2 and S3, the temperature is maintained at ≤35℃ throughout the process and light-protected operation is adopted.

[0036] The antioxidant described in this invention primarily functions to capture free radicals (such as oxygen free radicals) in fertilizer solutions. During fertilizer storage or application, changes in oxygen, light, or temperature can lead to the generation of free radicals. These free radicals attack unstable organic components such as S-propionylbenzene lactone, triggering a chain oxidation reaction. The structure of the antioxidant molecule allows it to donate electrons or hydrogen atoms to neutralize free radicals, thereby terminating the oxidation chain reaction, protecting the biological activity of S-propionylbenzene lactone, and ensuring its effectiveness as a plant growth regulator. During fertilizer preparation, the antioxidant molecule is added to an aqueous solution and dissolved along with macro- and micro-nutrient fertilizers. By capturing free radicals or blocking oxidation chain reactions through its own chemical structure, it prevents nutrients (such as S-propionylbenzene lactone and micronutrients) from being oxidized and destroyed, helping to maintain fertilizer activity and preventing nutrient loss or deterioration. The antioxidant works in conjunction with S-propionylbenzene lactone to prevent it from becoming ineffective due to oxidation during storage or application. Combined with dispersants (such as calcium lignosulfonate) and wetting and penetrating agents (such as lauryl alcohol polyoxyethylene ether), it ensures uniform dispersion and rapid penetration of fertilizer solutions.

[0037] This invention's fertilizer, through a scientifically proportioned formula, forms a multi-level synergistic system, overcoming the limitations of existing water-soluble fertilizers. By combining macro-, meso-, and micronutrient fertilizers, it provides a full spectrum of nutrition (NPK, Ca-Mg-S, Fe-Zn-Mn, etc.), covering the needs of plants throughout their growth cycle. A wetting and penetrating agent enhances the fertilizer's adhesion and penetration onto the soil and plant surfaces; S-propionylbenzene lactone regulates plant physiological processes, promotes nutrient absorption, and enhances crop resistance; a dispersant ensures a uniform and stable solution. The optimized preparation process uses environmentally friendly wetting and penetrating agents and antioxidants, reducing chemical pollution and oxidation losses. The components are interdependent: the antioxidant protects the activity of S-propionylbenzene lactone, the wetting and penetrating agent improves nutrient transport efficiency, and the dispersant maintains system stability, achieving a synergistic effect of "1+1>2," improving fertilizer utilization and accelerating plant growth. S-propionylbenzene lactone, as a core plant growth regulator, regulates plant hormone balance (such as promoting root development, enhancing photosynthesis, and improving stress resistance). At low concentrations, it activates plant metabolic enzymes, accelerating nutrient absorption and translocation, enhancing plant tolerance to adverse conditions (such as drought and salinity), and reducing nutrient loss. Synergistically with wetting and penetrating agents, which improve fertilizer adhesion to plant surfaces, S-propionylbenzene lactone is more easily absorbed. In conjunction with antioxidants, S-propionylbenzene lactone is easily oxidized and inactivated; antioxidants capture free radicals, protecting its biological activity. Wetting and penetrating agents reduce the surface tension of fertilizer solutions, enhancing the wettability and permeability of fertilizer on soil particles and plant leaves, allowing nutrients to quickly enter the plant. Environmentally friendly materials are used, reducing environmental pollution. Wetting and penetrating agents work synergistically with dispersants; the dispersant maintains solution homogeneity, while the wetting and penetrating agent ensures rapid diffusion, jointly preventing precipitation and excessively high local concentrations. Antioxidants capture free radicals, preventing oxidation chain reactions and protecting S-propionylbenzene lactone and micronutrients from oxidative degradation during storage or application. Fertilizer element components (macro, meso, and micronutrients) provide a comprehensive nutrient ratio. Synergistically with S-propionylbenzene lactone, plant growth regulators optimize nutrient metabolism, improving fertilizer utilization. In conjunction with wetting and penetrating agents, these agents help elements quickly penetrate the root system, preventing soil fixation. And in conjunction with dispersants, these agents prevent element precipitation and maintain solution homogeneity.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] 1. Improve fertilizer utilization and crop yield: By adding the plant growth regulator S-propionyl lactone and optimizing the fertilizer composition, the fertilizer of this invention can be absorbed and utilized by crops more efficiently, thereby significantly increasing crop yield.

[0040] 2. Enhance plant resistance: The S-propionyl benzyl lactone works synergistically with the wetting and penetrating agent to enhance the plant's resistance to diseases, reduce the disease infection rate, and improve the overall health of the plant.

[0041] 3. Improve fertilizer storage stability: By using specific antioxidants and optimizing the preparation process, the fertilizer is less prone to precipitation and stratification during storage, thus ensuring its long-term stability. Attached Figure Description

[0042] Figure 1 This is a production flow diagram of S-propionyl benzoyl lactone according to the present invention.

[0043] Figure 2 This is the NMR spectrum of antioxidant 1 described in this invention. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Synthesis example 1

[0046] Synthesis of Antioxidant 1:

[0047] ;

[0048] Step 1: Under nitrogen protection, 15g of raw material 1 was placed in a double-necked flask, and 200mL of dichloromethane was added. Then, 70.42g of 2-(7-azabenzotriazole)-N,N,N',N'-tetramethylurea hexafluorophosphate was added, and the mixture was stirred at room temperature for 1 hour. 19.89g of raw material 2 was dissolved in 50mL of dichloromethane and added to the above system. Then, 21.76g of N,N-diisopropylethylamine was added under an ice-water bath. The ice-water bath was removed, and the system was stirred at room temperature overnight. For post-treatment, 200mL of dichloromethane was added, followed by washing three times with hydrochloric acid solution, three times with saturated sodium bicarbonate solution, and the organic phase was washed with saturated sodium chloride. The mixture was dried over anhydrous sodium sulfate, filtered, and evaporated to dryness to obtain 25.35g of intermediate 1. M / Z MS+1: 190.

[0049] Step 2: Under nitrogen protection, 25.35 g of intermediate 1 and 28.33 g of raw material 3 were dissolved in 300 mL of a mixed solvent of 1,4-dioxane / diisopropylamine (200 mL / 100 mL). 0.2 g of Pd(OAc)2, 1.28 g of Xphos, and 0.51 g of CuI were added to the above system, and the reaction was carried out at 90 °C for 5 h. The reaction solution was concentrated, and the residue was separated by column chromatography to obtain 25.63 g of antioxidant 1.

[0050] Structural assessment:

[0051] Mass spectrometry of antioxidant 1 (M / Z MS+1:380).

[0052] The 1H NMR (Chloroform-d) values ​​of antioxidant 1 were 9.70 (s, 1H), 8.42 (d, 1H), 7.86 (dd, 1H), 7.31 (d, 1H), 5.80 (s, 1H), 5.04 (d, 2H), 4.32 (s, 1H), 4.10 (h, 1H), 3.19 (d, 1H), 2.93 (d, 1H), and 1.39 (d, 3H).

[0053] Synthesis Example 2-Synthesis Example 4

[0054] In Synthesis Examples 2-4, antioxidants 2-4 were prepared sequentially, following the preparation method of Synthesis Example 1, except that raw material 1 was replaced, while the rest remained the same as in Synthesis Example 1. The specific structures of raw material 1, antioxidants 2-4, and their M / Z MS+1 are shown in Table 1.

[0055] Table 1.

[0056] Example 1

[0057] Preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent:

[0058] 1. Raw material mass ratio:

[0059] S-propionyl lactone: 0.03 parts;

[0060] Wetting and penetrating agent: 2 parts, selected from lauryl alcohol polyoxyethylene ether (purchased from: Hubei Jusheng Technology Co., Ltd., CAS: 9002-92-0).

[0061] Macronutrient fertilizer: 32 parts, nitrogen source selected from urea, phosphorus source selected from monoammonium phosphate, potassium source selected from potassium dihydrogen phosphate, the mass ratio of nitrogen source, phosphorus source, and potassium source is 2:1:1;

[0062] Medium-element fertilizer: 3 parts, calcium source is selected from calcium nitrate, magnesium source is selected from magnesium nitrate, sulfur source is selected from ammonium sulfate, and the mass ratio of calcium source, magnesium source and sulfur source is 4:1:2;

[0063] Micronutrient fertilizer: 0.08 parts, with the mass ratio of EDTA chelated iron, EDTA chelated zinc, EDTA chelated manganese, EDTA chelated copper, EDTA chelated molybdenum, and EDTA chelated boron being 5:2:2:0.6:0.3:0.2;

[0064] Dispersant: 7 parts, selected from calcium lignosulfonate (purchased from: Tianjin Ensi Biochemical Technology Co., Ltd., CAS: 8061-52-7);

[0065] Antioxidant: 0.6 parts, selected from antioxidant 1 synthesized in Synthesis Example 1;

[0066] Water: 42 portions.

[0067] 2. Preparation method:

[0068] S1. Add the macro-element fertilizer, medium-element fertilizer, micro-element fertilizer, antioxidant and water into a stirrer, stir at 55°C for 30 minutes (stirring speed 300 rpm) until completely dissolved to form a mother liquor;

[0069] S2. Add wetting and penetrating agent and dispersant to the mother liquor in sequence, and stir and mix at 200 rpm for 20 minutes under light-protected conditions, maintaining a temperature of 25°C, to obtain a uniform mixture A;

[0070] S3. The S-propionyl benzyl lactone is pre-dissolved in acetone to prepare a solution with a mass concentration of 0.03%. Under light-protected conditions and with the temperature maintained at 25°C, the S-propionyl benzyl lactone acetone solution is added to mixture A and stirred at 150 rpm for 15 minutes to obtain mixture B.

[0071] S4. The mixture B is filtered through a 0.45 μm filter membrane to remove impurities. The filtrate is then sealed in a light-proof and moisture-proof container to obtain the finished product, a multifunctional water-soluble fertilizer containing S-propionyl benzoyl lactone and a wetting and penetrating agent.

[0072] Examples 2-4

[0073] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzoyl lactone and a wetting and penetrating agent is carried out by referring to the preparation method of Example 1, except that the antioxidant is replaced sequentially with antioxidant 2-antioxidant 4 prepared in Synthesis Examples 2-4, and the rest is the same as in Example 1.

[0074] Comparative Example 1

[0075] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzoyl lactone and a wetting and penetrating agent is carried out by referring to the preparation method of Example 1, except that the antioxidant is replaced with citric acid (CAS: 77-92-9), and the rest is the same as in Example 1.

[0076] Comparative Example 2

[0077] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzoyl lactone and a wetting and penetrating agent is carried out by referring to the preparation method of Example 1, except that the antioxidant is replaced with alanine (CAS: 338-69-2), and the rest is the same as in Example 1.

[0078] Comparative Example 3

[0079] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent is carried out by referring to the preparation method of Example 1, except that the antioxidant is replaced with comparative compound 1, and the rest is the same as in Example 1.

[0080] Comparative compound 1: .

[0081] Comparative Example 4

[0082] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent is carried out according to the preparation method of Example 1, except that the antioxidant is not added, and the rest is the same as in Example 1.

[0083] Comparative Example 5

[0084] The preparation of a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent is carried out according to the preparation method of Example 1, except that S-propionyl benzyl lactone is not added, and the rest is the same as in Example 1.

[0085] Performance testing:

[0086] 1. Nine treatments were set up in the greenhouse, with three replicates for each treatment and each replicate being 30m². 2 Healthy cucumbers (in the seedling stage) were transplanted and then fertilized. Water-soluble fertilizers from Examples 1-4 and Comparative Examples 1-5 were applied, with Youduoshou water-soluble fertilizer as the control. 2 kg of base fertilizer was applied, and 1.5 kg was applied during the cucumber flowering period. Other management practices were the same as conventional management. The results are shown in Table 2.

[0087] 2. Stability Test: Stability tests were conducted on the water-soluble fertilizers of Examples 1-4 and Comparative Examples 1-5 to observe whether precipitation, flocculation, stratification, or other phenomena occurred. The specific procedures are as follows:

[0088] The water-soluble fertilizers from Examples 1-4 and Comparative Examples 1-5 were stored in a constant temperature incubator at 54°C for 14 days, and then observed after being removed and cooled to room temperature. The results are shown in Table 2.

[0089] Table 2.

[0090]

[0091] As shown in Table 2, the multifunctional water-soluble fertilizer of this invention (Examples 1-4) exhibits significant advantages in cucumber cultivation. Compared with the comparative examples and conventional compound fertilizers, the fertilizers in these examples effectively increase the overall yield and single fruit weight of the crop, while significantly reducing the infection rate of bacterial angular leaf spot, indicating that they enhance the plant's disease resistance. Regarding stability, the products in these examples showed no adverse phenomena, while the comparative examples and controls exhibited precipitation or stratification issues, highlighting the reliability of the multifunctional water-soluble fertilizer of this invention during storage and application. Overall, the multifunctional water-soluble fertilizer containing S-propionyl benzoyl lactone and a wetting and penetrating agent described in this invention achieves significant improvements in yield increase, stress resistance, and stability through optimized composition and process.

[0092] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent, characterized in that, The fertilizer contains S-propionyl benzoyl lactone; The S-propionyl rutin lactone is the compound shown in Formula 1; Equation 1 is... ; The fertilizer comprises the following components in the indicated mass ratios: S-propionyl lactone: 0.01-0.05 parts, wetting and penetrating agent: 0.5-3 parts, macronutrient fertilizer: 30-35 parts, mesonutrient fertilizer: 1-5 parts, micronutrient fertilizer: 0.05-0.1 parts, dispersant: 5-10 parts, antioxidant: 0.5-1 part, and water: 40-50 parts. The antioxidant is the compound described in Formula 2; Equation 2 is ; In Formula 2, R1 is a substituent, wherein R1 is selected from alkyl or phenyl groups having 1-5 carbon atoms.

2. The multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The wetting and penetrating agent is selected from at least one of lauryl alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate.

3. The multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The macro-element fertilizer is composed of nitrogen, phosphorus, and potassium sources; The nitrogen source is selected from at least one of ammonium nitrate and urea; The phosphorus source is selected from at least one of monoammonium phosphate and ammonium polyphosphate; The potassium source is selected from at least one of potassium nitrate and potassium dihydrogen phosphate; The mass ratio of the nitrogen source, phosphorus source and potassium source is (1-3):1:

1.

4. A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The medium-element fertilizer is composed of calcium, magnesium, and sulfur sources; The calcium source is selected from at least one of calcium nitrate and calcium chloride; The magnesium source is selected from at least one of magnesium nitrate and magnesium sulfate; The sulfur source is selected from at least one of ammonium sulfate and potassium sulfate; The mass ratio of the calcium source, magnesium source and sulfur source is (2-6):(0.5-2):(0.5-3).

5. A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The micronutrient fertilizer is composed of EDTA chelated iron, EDTA chelated zinc, EDTA chelated manganese, EDTA chelated copper, EDTA chelated molybdenum, and EDTA chelated boron in a mass ratio of (4-6):(1-3):(1-3):(0.5-1):(0.2-0.5):(0.1-0.5).

6. A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The dispersant is selected from at least one of calcium lignosulfonate, sodium lignosulfonate, and sodium carboxymethyl cellulose.

7. A multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 1, characterized in that, The antioxidant is any one of the compounds shown in the following structures: ； 。 8. A method for preparing a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Dissolve the macro-element fertilizer, medium-element fertilizer, micro-element fertilizer and antioxidant in water at 50-60℃ and stir to form a mother liquor; S2. Add the wetting and penetrating agent and dispersant to the mother liquor, stir and mix to obtain mixture A; S3. The S-propionyl lactone is pre-dissolved in acetone to prepare a solution with a mass concentration of 0.01%-0.05%, which is then added to the mixture A and stirred to obtain mixture B; S4. Filter and package to obtain a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent.

9. A method for preparing a multifunctional water-soluble fertilizer containing S-propionyl benzyl lactone and a wetting and penetrating agent according to claim 8, characterized in that, In steps S2 and S3, the temperature is kept ≤35℃ throughout the process and light is avoided.

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