Preparation method of sulfydryl leaf fertilizer for reducing cadmium content in vegetables
By preparing a thiol-based foliar fertilizer containing specific components, the problem of the inability of existing technologies to effectively reduce cadmium content in vegetables has been solved. This achieves cadmium ion chelation and nutritional support, promotes vegetable growth and development, and improves food safety and health levels.
Patent Information
- Application Number
- CN202510815793.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-11-11
AI Technical Summary
In existing technologies, foliar fertilizer formulations and preparation methods cannot effectively reduce the cadmium content in vegetables, posing a threat to food safety and human health.
A thiol-based foliar fertilizer formula containing potassium glutamate, S-allyl-L-cysteine, 2-piperidinic acid, glutathione, fulvic acid, natural seaweed extract, licorice extract, aloe extract, betaine, mannitol, and seaweed polysaccharides is used. Through specific preparation steps, the ingredients are ensured to be evenly mixed and the pH value is adjusted to form an effective cadmium ion chelation system.
It significantly reduces the cadmium content in vegetables, enhances the plant's disease resistance and stress tolerance, promotes vegetable growth and development, and increases yield and quality.
Smart Images
Figure CN120923282A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of vegetable foliar fertilizer technology, specifically a method for preparing a thiol-based foliar fertilizer that reduces cadmium content in vegetables. Background Technology
[0002] Cadmium is a toxic heavy metal that poses significant risks to plant growth and development as well as human health. Vegetables, an indispensable part of people's daily diet, have cadmium content that directly impacts food safety and human health. Currently, methods for remediating cadmium pollution in soil mainly include soil amendment, phytoremediation, and chemical passivation. However, these methods suffer from drawbacks such as high cost, complex operation, and inconsistent effectiveness. Foliar fertilizers, applied directly to plant leaves, offer advantages such as rapid absorption and significant effects, but their application in reducing cadmium content in vegetables is still insufficient.
[0003] However, existing foliar fertilizer formulations and preparation methods for reducing cadmium content in vegetables cannot solve the problem of soil cadmium pollution, thus their effectiveness in ensuring food safety and human health is not ideal. Summary of the Invention
[0004] The purpose of this invention is to provide a method for preparing a thiol-based foliar fertilizer that reduces cadmium content in vegetables in order to solve the problems mentioned above.
[0005] The technical solution adopted in this invention is as follows: a thiol-based foliar fertilizer for reducing cadmium content in vegetables, the thiol-based foliar fertilizer comprising:
[0006] Potassium glutamate: 8-12 parts by weight, S-allyl-L-cysteine: 4-6 parts by weight, 2-piperidinic acid: 1.5-2.5 parts by weight, glutathione: 4-6 parts by weight, fulvic acid: 2.5-3.5 parts by weight, natural seaweed extract: 0.5-1.5 parts by weight, licorice extract: 1.5-2.5 parts by weight, aloe extract: 0.5-1.5 parts by weight, betaine: 0.5-1.5 parts by weight, mannitol: 0.5-1.5 parts by weight, seaweed polysaccharide: 0.5-1.5 parts by weight, glutamic acid: 0.5-1.5 parts by weight, water: 70-80 parts by weight.
[0007] In a preferred embodiment, the preparation method includes the following steps:
[0008] S1: According to the formula requirements, accurately weigh 8-12 parts by weight of potassium glutamate, 4-6 parts by weight of S-allyl-L-cysteine, 1.5-2.5 parts by weight of 2-piperidinic acid, 4-6 parts by weight of glutathione, 2.5-3.5 parts by weight of fulvic acid, 0.5-1.5 parts by weight of natural seaweed extract, 1.5-2.5 parts by weight of licorice extract, 0.5-1.5 parts by weight of aloe vera extract, 0.5-1.5 parts by weight of betaine, 0.5-1.5 parts by weight of mannitol, 0.5-1.5 parts by weight of seaweed polysaccharide, and 0.5-1.5 parts by weight of glutamic acid.
[0009] S2: Add potassium glutamate, S-allyl-L-cysteine, 2-piperidinic acid, glutathione, and solid glutamate to 70-80 parts by weight of water and stir until completely dissolved;
[0010] S3: Slowly add fulvic acid to the above solution while stirring to ensure that it is evenly dispersed in the solution;
[0011] S4: Add the natural seaweed extract, licorice extract, and aloe vera extract to the solution in sequence, stirring thoroughly after each addition to ensure they are fully mixed with the solution;
[0012] S5: Add betaine, mannitol, and seaweed polysaccharide to the solution in sequence, stirring after each addition to ensure that all components are evenly distributed;
[0013] S6: Use a pH meter to detect the pH value of the solution, and adjust the pH of the solution to a suitable range as needed using an acid-base regulator;
[0014] S7: Homogenize the solution using a homogenizer or high-speed mixer to ensure the uniformity and stability of the solution;
[0015] S8: Filter the homogenized solution through a filter screen or filter to remove any impurities and particles that may be present;
[0016] S9: Fill the filtered mercapto foliar fertilizer solution into a pre-sterilized container, seal it, and store it in a cool, dry place, avoiding direct sunlight and high temperatures.
[0017] In a preferred embodiment, in step S1, it is recommended to use an electronic balance with an accuracy of 0.01g to weigh the raw materials in this formula to ensure weighing accuracy; for hygroscopic raw materials, weighing should be carried out quickly and sealed immediately after weighing; for highly volatile raw materials, weighing should be done in a sealed container to avoid loss due to volatilization; after weighing, the raw materials should be transferred to a mixing container in a timely manner to avoid errors or contamination caused by prolonged storage.
[0018] In a preferred embodiment, in step S2, the water temperature is controlled at 25-30°C, and a magnetic stirrer is used to stir at 600 rpm for 30 minutes until all solids are completely dissolved and the solution is uniform and transparent; ensuring that no precipitate or flocculent matter is generated during the dissolution process.
[0019] In a preferred embodiment, in step S3, 3 parts by weight of fulvic acid are slowly added to the above solution while manually stirring with a glass rod. The stirring speed is controlled at 2-3 revolutions per second to ensure that the fulvic acid is evenly dispersed in the solution and to avoid precipitation caused by excessively high local concentrations. During the addition process, the solution temperature should be maintained at 25-30°C, and the entire process lasts for 10-15 minutes.
[0020] In a preferred embodiment, in step S4, a high-speed mixer is used to stir at 1000 rpm for 5 minutes to ensure that each extract is fully mixed with the solution; during the stirring process, the solution temperature should be controlled at 25-30°C to avoid high temperature affecting the activity of the extract.
[0021] In a preferred embodiment, in step S5, a magnetic stirrer is used to stir at 800 rpm for 15 minutes to ensure that all components are evenly distributed; during the stirring process, the solution temperature should be maintained at 25-30℃ to avoid temperature fluctuations affecting the stability of the components.
[0022] In a preferred embodiment, in step S6, the pH value of the solution is detected using a pH meter, and the initial pH value should be between 4.0 and 6.0. If necessary, the pH value is adjusted using 0.1M sodium hydroxide or 0.1M hydrochloric acid solution. After each adjustment, the solution is stirred thoroughly and the pH value is re-detected until the pH value of the solution stabilizes within a suitable range of 5.0-7.0. During the adjustment process, the solution temperature should be maintained at 25-30℃ to avoid temperature changes affecting the pH value measurement.
[0023] In step S7, the solution is transferred to a homogenizer, the homogenizer speed is set to 3000 rpm, and the processing time is 10 minutes to ensure the homogeneity and stability of the solution. During the homogenization process, the solution temperature should be controlled at 25-30℃ to avoid high temperature affecting the activity of the components. After homogenization, the solution should present as a fine and uniform emulsion.
[0024] In a preferred embodiment, in step S8, the filtration pressure is controlled at 0.1-0.2 MPa, and the filtration speed is controlled at 100-200 ml per minute to remove any possible impurities and particles; during the filtration process, the solution temperature should be maintained at 25-30℃ to avoid temperature changes affecting the filtration effect; the filtered solution should be clear and transparent, without suspended matter.
[0025] In a preferred embodiment, in step S9, the filtered thiol foliar fertilizer solution is filled into a pre-sterilized brown glass bottle or PE plastic bottle, with the filling volume error controlled within ±2%; after filling, the bottle mouth is immediately sealed to prevent air contact; the sealed container is stored in a cool, dry place, with the storage temperature controlled at 10-25℃, avoiding direct sunlight and high temperatures; during storage, the solution status is checked regularly to ensure its stability and effectiveness.
[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0027] 1. In this invention, potassium glutamate, as a potassium salt, not only provides the potassium element required for plant growth but also promotes the dissolution and absorption of other components through its excellent water solubility. Potassium is an important nutrient element for plant growth, enhancing the plant's disease resistance and stress tolerance, thereby improving the overall health of vegetables. Secondly, S-allyl-L-cysteine, as a sulfur-containing amino acid derivative, has a strong chelating ability, effectively chelating cadmium ions and reducing their absorption by plants, thus significantly reducing the cadmium content in vegetables. This chelating effect not only mitigates the toxicity of heavy metals to plants but also improves the soil environment, which is beneficial to plant growth.
[0028] 2. In this invention, 2-piperidinic acid plays a synergistic role in the formulation. As an organic acid, it can regulate the pH of the solution, keeping it within a suitable range, thus benefiting the stability and activity of other components. Furthermore, 2-piperidinic acid also possesses certain antioxidant properties, protecting plant cells from free radical damage and enhancing plant stress resistance. The combination of these three elements not only forms an effective cadmium ion chelation system but also provides comprehensive nutritional support and protection mechanisms, enabling this thiol-based foliar fertilizer to reduce cadmium content in vegetables while promoting their growth and development, thereby increasing yield and quality. This multi-effect combination makes this formulation widely applicable and valuable in agricultural production. Attached Figure Description
[0029] Figure 1 This is a flowchart illustrating the principle and method of the present invention. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0031] Reference Figure 1 ,
[0032] Example:
[0033] A thiol-based foliar fertilizer for reducing cadmium content in vegetables, comprising:
[0034] Potassium glutamate: 12 parts by weight, S-allyl-L-cysteine: 6 parts by weight, 2-piperidinic acid: 2.5 parts by weight, glutathione: 6 parts by weight, fulvic acid: 3.5 parts by weight, natural seaweed extract: 1.5 parts by weight, licorice extract: 2.5 parts by weight, aloe extract: 1.5 parts by weight, betaine: 1.5 parts by weight, mannitol: 1.5 parts by weight, seaweed polysaccharide: 1.5 parts by weight, glutamic acid: 1.5 parts by weight, water: 80 parts by weight.
[0035] The preparation method includes the following steps:
[0036] S1: According to the formula requirements, accurately weigh 8-12 parts by weight of potassium glutamate, 4-6 parts by weight of S-allyl-L-cysteine, 1.5-2.5 parts by weight of 2-piperidinic acid, 4-6 parts by weight of glutathione, 2.5-3.5 parts by weight of fulvic acid, 0.5-1.5 parts by weight of natural seaweed extract, 1.5-2.5 parts by weight of licorice extract, 0.5-1.5 parts by weight of aloe vera extract, 0.5-1.5 parts by weight of betaine, 0.5-1.5 parts by weight of mannitol, 0.5-1.5 parts by weight of seaweed polysaccharide, and 0.5-1.5 parts by weight of glutamic acid.
[0037] S2: Add solid raw materials such as potassium glutamate, S-allyl-L-cysteine, 2-piperidinic acid, glutathione, and glutamic acid to 70-80 parts by weight of water and stir until completely dissolved;
[0038] S3: Slowly add fulvic acid to the above solution while stirring to ensure that it is evenly dispersed in the solution;
[0039] S4: Add the natural seaweed extract, licorice extract, and aloe vera extract to the solution in sequence, stirring thoroughly after each addition to ensure they are fully mixed with the solution;
[0040] S5: Add betaine, mannitol, and seaweed polysaccharide to the solution in sequence, stirring after each addition to ensure that all components are evenly distributed;
[0041] S6: Use a pH meter to detect the pH value of the solution, and adjust the pH of the solution to a suitable range (5.0-7.0) as needed using an appropriate amount of acid-base adjuster (such as sodium hydroxide or hydrochloric acid);
[0042] S7: Homogenize the solution using a homogenizer or high-speed mixer to ensure the uniformity and stability of the solution;
[0043] S8: Filter the homogenized solution through a filter screen or filter to remove any impurities and particles that may be present;
[0044] S9: Fill the filtered mercapto foliar fertilizer solution into a pre-sterilized container, seal it, and store it in a cool, dry place, avoiding direct sunlight and high temperatures.
[0045] In step S1, it is recommended to use an electronic balance with an accuracy of 0.01g to weigh the raw materials in this formula to ensure weighing accuracy. For hygroscopic raw materials, weighing should be done quickly, and the materials should be sealed and stored immediately after weighing. For highly volatile raw materials, weighing should be done in a sealed container to avoid loss due to volatilization. After weighing, the raw materials should be transferred to a mixing container in a timely manner to avoid errors or contamination caused by prolonged storage.
[0046] In step S2, the water temperature is controlled at 25-30℃, and a magnetic stirrer is used to stir at 600 rpm for 30 minutes until all solids are completely dissolved and the solution is uniform and transparent. Ensure that no precipitate or flocculent matter is formed during the dissolution process.
[0047] In step S3, slowly add 3 parts by weight of fulvic acid to the above solution while manually stirring with a glass rod at a speed of 2-3 revolutions per second to ensure that the fulvic acid is evenly dispersed in the solution and to avoid precipitation caused by excessively high local concentrations. The solution temperature should be maintained at 25-30℃ during the addition process, which should last for 10-15 minutes.
[0048] In step S4, use a high-speed mixer at 1000 rpm for 5 minutes to ensure thorough mixing of each extract with the solution. During mixing, the solution temperature should be controlled between 25-30℃ to avoid affecting the extract activity due to high temperatures.
[0049] In step S5, use a magnetic stirrer to stir at 800 rpm for 15 minutes to ensure all components are evenly distributed. During stirring, the solution temperature should be maintained at 25-30℃ to avoid temperature fluctuations affecting component stability.
[0050] In step S6, the pH value of the solution is measured using a pH meter. The initial pH value should be between 4.0 and 6.0. If necessary, the pH value is adjusted using 0.1M sodium hydroxide or 0.1M hydrochloric acid solution. After each adjustment, the solution is thoroughly stirred and the pH value is measured again until the solution pH value stabilizes within the suitable range of 5.0-7.0. During the adjustment process, the solution temperature should be maintained at 25-30℃ to avoid temperature changes affecting the pH measurement.
[0051] In step S7, the solution is transferred to a homogenizer, and the homogenizer speed is set to 3000 rpm for 10 minutes to ensure the homogeneity and stability of the solution. During homogenization, the solution temperature should be controlled between 25-30℃ to avoid high temperatures affecting the activity of the components. After homogenization, the solution should present as a fine and uniform emulsion.
[0052] In step S8, the filtration pressure is controlled at 0.1-0.2 MPa, and the filtration speed is controlled at 100-200 ml per minute to remove any impurities and particles that may be present. During the filtration process, the solution temperature should be maintained at 25-30℃ to avoid temperature fluctuations affecting the filtration effect. The filtered solution should be clear and transparent, without any suspended matter.
[0053] In step S9, the filtered thiol foliar fertilizer solution is filled into pre-sterilized brown glass or PE plastic bottles, with the filling volume error controlled within ±2%. After filling, the bottle opening is immediately sealed to prevent air contact. The sealed containers are stored in a cool, dry place at a temperature controlled between 10-25℃, avoiding direct sunlight and high temperatures. During storage, the solution status is checked regularly to ensure its stability and effectiveness.
[0054] Experimental example:
[0055] I. Experimental Design
[0056] Test subjects: Locally common vegetable varieties with high cadmium absorption, such as spinach and lettuce, were selected.
[0057] Experimental Groups:
[0058] Control group (CK): No foliar fertilizer was used.
[0059] Treatment group (T1): The above-formulated thiol foliar fertilizer was used.
[0060] Experimental location: Experimental field of an agricultural research base.
[0061] Trial period: March 2023 to June 2023.
[0062] Fertilization method: Prepare thiol foliar fertilizer according to the above preparation method, and spray it on the leaves during the key growth stages of vegetables (such as seedling stage, growth stage and maturity stage). The amount of fertilizer sprayed each time should be adjusted according to the growth of vegetables.
[0063] II. Test Methods
[0064] Soil treatment: Before the experiment, the soil in the experimental field was treated uniformly to ensure that the cadmium content in the soil was basically consistent.
[0065] Vegetable cultivation: Vegetables were cultivated according to conventional methods to ensure that the cultivation conditions of the control group and the treatment group were the same.
[0066] Foliar fertilizer application: During the critical period of vegetable growth, the treatment group was sprayed with thiol foliar fertilizer, while the control group was not sprayed.
[0067] Sample collection: Vegetable samples were collected from the control group and the treatment group during the vegetable maturity period to determine cadmium content and growth indicators.
[0068] III. The test data are shown in the table below.
[0069] Table 1. Results of cadmium content determination in vegetables (unit: mg / kg)
[0070] Group cadmium content in spinach Cadmium content in lettuce Control group (CK) 0.85±0.1 0.75±0.1 Processing group (T1) 0.45±0.1 0.35±0.1
[0071] Table 2 Results of vegetable growth index measurement
[0072] Group Spinach plant height (cm) Number of spinach leaves Lettuce plant height (cm) Number of lettuce leaves Control group (CK) 25±3 5±3 20±3 4±3 Processing group (T1) 30±2 7±2 25±2 6±2
[0073] IV. Data Analysis
[0074] Cadmium content analysis: As shown in Table 1, the cadmium content of spinach and lettuce in the treatment group (T1) was significantly lower than that in the control group (CK), indicating that thiol foliar fertilizer effectively reduced the cadmium content in vegetables.
[0075] Growth index analysis: As shown in Table 2, the spinach and lettuce in the treatment group (T1) were superior to the control group (CK) in terms of plant height and number of leaves, indicating that the thiol foliar fertilizer promoted the growth and development of vegetables while reducing cadmium content.
[0076] The experimental results above show that potassium glutamate, as a potassium salt, not only provides the potassium element needed for plant growth but also promotes the dissolution and absorption of other components through its excellent water solubility. Potassium is an important nutrient element for plant growth, enhancing the plant's disease resistance and stress tolerance, thereby improving the overall health of vegetables. Secondly, S-allyl-L-cysteine, as a sulfur-containing amino acid derivative, has a strong chelating ability, effectively chelating cadmium ions and reducing their absorption by plants, thus significantly reducing the cadmium content in vegetables. This chelation effect not only reduces the toxicity of heavy metals to plants but also improves the soil environment, which is beneficial to plant growth.
[0077] In this invention, 2-piperidinic acid plays a synergistic role in the formulation. As an organic acid, it can regulate the pH of the solution, keeping it within a suitable range, thereby benefiting the stability and activity of other components. Furthermore, 2-piperidinic acid also possesses certain antioxidant properties, protecting plant cells from free radical damage and enhancing plant stress resistance. The combination of these three elements not only forms an effective cadmium ion chelation system but also provides comprehensive nutritional support and protection mechanisms, enabling this thiol-based foliar fertilizer to reduce cadmium content in vegetables while promoting their growth and development, thus increasing yield and quality. This multi-effect combination makes this formulation widely applicable and valuable in agricultural production.
[0078] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A thiol-based foliar fertilizer for reducing cadmium content in vegetables, characterized in that: The thiol foliar fertilizer includes: Potassium glutamate: 8-12 parts by weight, S-allyl-L-cysteine: 4-6 parts by weight, 2-piperidinic acid: 1.5-2.5 parts by weight, glutathione: 4-6 parts by weight, fulvic acid: 2.5-3.5 parts by weight, natural seaweed extract: 0.5-1.5 parts by weight, licorice extract: 1.5-2.5 parts by weight, aloe extract: 0.5-1.5 parts by weight, betaine: 0.5-1.5 parts by weight, mannitol: 0.5-1.5 parts by weight, seaweed polysaccharide: 0.5-1.5 parts by weight, glutamic acid: 0.5-1.5 parts by weight, water: 70-80 parts by weight.
2. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: The preparation method includes the following steps: S1: According to the formula requirements, accurately weigh 8-12 parts by weight of potassium glutamate, 4-6 parts by weight of S-allyl-L-cysteine, 1.5-2.5 parts by weight of 2-piperidinic acid, 4-6 parts by weight of glutathione, 2.5-3.5 parts by weight of fulvic acid, 0.5-1.5 parts by weight of natural seaweed extract, 1.5-2.5 parts by weight of licorice extract, 0.5-1.5 parts by weight of aloe vera extract, 0.5-1.5 parts by weight of betaine, 0.5-1.5 parts by weight of mannitol, 0.5-1.5 parts by weight of seaweed polysaccharide, and 0.5-1.5 parts by weight of glutamic acid. S2: Add potassium glutamate, S-allyl-L-cysteine, 2-piperidinic acid, glutathione, and solid glutamate to 70-80 parts by weight of water and stir until completely dissolved; S3: Slowly add fulvic acid to the above solution while stirring to ensure that it is evenly dispersed in the solution; S4: Add the natural seaweed extract, licorice extract, and aloe vera extract to the solution in sequence, stirring thoroughly after each addition to ensure they are fully mixed with the solution; S5: Add betaine, mannitol, and seaweed polysaccharide to the solution in sequence, stirring after each addition to ensure that all components are evenly distributed; S6: Use a pH meter to detect the pH value of the solution, and adjust the pH of the solution to a suitable range as needed using an acid-base regulator; S7: Homogenize the solution using a homogenizer or high-speed mixer to ensure the uniformity and stability of the solution; S8: Filter the homogenized solution through a filter screen or filter to remove any impurities and particles that may be present; S9: Fill the filtered mercapto foliar fertilizer solution into a pre-sterilized container, seal it, and store it in a cool, dry place, avoiding direct sunlight and high temperatures.
3. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S1, it is recommended to use an electronic balance with an accuracy of 0.01g to weigh the raw materials in this formula to ensure weighing accuracy. For hygroscopic raw materials, weighing should be done quickly and the materials should be sealed and stored immediately after weighing. For highly volatile raw materials, weighing should be done in a sealed container to avoid loss due to volatilization. After weighing, the raw materials should be transferred to a mixing container in a timely manner to avoid errors or contamination caused by prolonged storage.
4. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S2, the water temperature is controlled at 25-30℃, and a magnetic stirrer is used to stir at 600 rpm for 30 minutes until all solids are completely dissolved and the solution is uniform and transparent. Ensure that no precipitate or flocculent matter is formed during the dissolution process.
5. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S3, 3 parts by weight of fulvic acid are slowly added to the above solution while manually stirring with a glass rod at a speed of 2-3 revolutions per second to ensure that the fulvic acid is evenly dispersed in the solution and to avoid precipitation caused by excessive local concentration. During the addition process, the solution temperature is maintained at 25-30℃ and the whole process lasts for 10-15 minutes.
6. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S4, a high-speed mixer is used to stir at 1000 rpm for 5 minutes to ensure that each extract is fully mixed with the solution. During the stirring process, the solution temperature is controlled at 25-30℃ to avoid high temperature affecting the activity of the extract.
7. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S5, a magnetic stirrer is used to stir at 800 rpm for 15 minutes to ensure that all components are evenly distributed. During the stirring process, the solution temperature is maintained at 25-30℃ to avoid temperature fluctuations affecting the stability of the components.
8. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S6, the pH value of the solution is detected using a pH meter, with the initial pH value between 4.0 and 6.
0. If necessary, the pH value is adjusted using 0.1M sodium hydroxide or 0.1M hydrochloric acid solution. After each adjustment, the solution is stirred thoroughly and the pH value is re-detected until the pH value of the solution stabilizes within a suitable range of 5.0-7.
0. During the adjustment process, the solution temperature is maintained at 25-30℃ to avoid temperature changes affecting the pH value measurement. In step S7, the solution is transferred to a homogenizer, the homogenizer speed is set to 3000 rpm, and the processing time is 10 minutes to ensure the homogeneity and stability of the solution. During homogenization, the solution temperature is controlled at 25-30℃ to avoid high temperature affecting the activity of the components; after homogenization, the solution presents a fine and uniform emulsion.
9. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S8, the filtration pressure is controlled at 0.1-0.2 MPa, and the filtration speed is controlled at 100-200 ml per minute to remove any possible impurities and particles. During the filtration process, the solution temperature is maintained at 25-30℃ to avoid temperature changes affecting the filtration effect. The filtered solution is clear and transparent, with no suspended matter.
10. The method for preparing a thiol-based foliar fertilizer for reducing cadmium content in vegetables as described in claim 1, characterized in that: In step S9, the filtered thiol foliar fertilizer solution is filled into pre-sterilized brown glass bottles or PE plastic bottles, with the filling volume error controlled within ±2%; after filling, the bottle mouth is sealed immediately to avoid air contact; the sealed container is stored in a cool and dry place, with the storage temperature controlled at 10-25℃, avoiding direct sunlight and high temperature. During storage, check the solution status regularly to ensure its stability and effectiveness.