Vegetable selenium-rich nutrient solution and preparation method thereof

Abstract

The invention relates to the technical field of vegetable planting, in particular to a vegetable selenium-rich nutrient solution and a preparation method thereof. The foliar fertilizer is prepared from the following raw material components in parts by weight: 1 to 10 parts of selenide, 0.05 to 0.5 part of chelate, 0.01 to 1 part of a microbial agent, 0.1 to 1 part of a trace element mixture, 0.05 to 3 parts of a stabilizer, 0.01 to 0.05 part of water-soluble vitamin, 88 to 98 parts of water and a pH (Potential of Hydrogen) regulator. The nutrient solution provided by the invention is simple in components, convenient to prepare, environment-friendly and capable of effectively increasing the selenium content of the vegetables, so that the market demand is met, and the sustainable development of agriculture is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of vegetable planting, and in particular to a vegetable selenium-enriched nutrient solution and a preparation method thereof. Background Art

[0002] With the continuous development of modern agricultural technology, people have higher and higher requirements for the quality of agricultural products. As an important part of people's daily diet, the nutritional value of vegetables has attracted much attention. Selenium is one of the essential trace elements for the human body. It has multiple biological activities such as anti-cancer, anti-cancer, and anti-oxidation, and plays an important role in human health. Therefore, how to increase the selenium content in vegetables has become one of the hot topics in the current agricultural research field.

[0003] At present, there are some selenium-enriched vegetable nutrient solutions on the market, but most of these nutrient solutions have problems such as complex ingredients, complicated preparation processes, and high costs. In addition, some nutrient solutions can easily pollute the soil and vegetables during the application process, which is not conducive to environmental protection and sustainable development. Summary of the invention

[0004] The present invention provides a selenium-enriched vegetable nutrient solution and a preparation method thereof, aiming to solve the problems existing in the prior art and provide a nutrient solution which has simple ingredients, is convenient to prepare, is environmentally friendly and can effectively increase the selenium content of vegetables, so as to meet market demand and promote sustainable development of agriculture.

[0005] The technical solution adopted by the present invention is: a vegetable selenium-enriched nutrient solution, which is composed of the following raw material components in parts by weight: 1-10 parts of selenide, 0.05-0.5 parts of chelate, 0.01-1 parts of microbial agent, 0.1-1 parts of trace element mixture, 0.05-3 parts of stabilizer, 0.01-0.05 parts of water-soluble vitamins, 88-98 parts of water, and a pH regulator.

[0006] As a further improvement of the present invention, the selenide is one of water-soluble sodium selenite and selenomethionine.

[0007] As a further improvement of the present invention, the chelate is one of disodium EDTA and ammonium ferric citrate.

[0008] As a further improvement of the present invention, the microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus, and actinomycetes.

[0009] As a further improvement of the present invention, the trace element mixture contains essential trace elements for plants, namely iron, zinc, copper and manganese, wherein the ratio of iron, zinc, copper and manganese is 3:2:1:2.

[0010] As a further improvement of the present invention, the stabilizer is one of polyvinyl alcohol, sodium polyacrylate and mannitol.

[0011] As a further improvement of the present invention, the pH regulator is one of citric acid and sodium hydroxide, and the pH value is controlled between 5.5-7.5.

[0012] As a further improvement of the present invention, the water-soluble microorganism is a mixture of vitamin B1, vitamin B2, vitamin B6, vitamin B12, and vitamin C.

[0013] A method for preparing a vegetable selenium-enriched nutrient solution comprises the following steps:

[0014] Step 1: weigh various raw material components according to the above weight parts;

[0015] Step 2: Add the selenide and trace element mixture into water, stir and dissolve them thoroughly to obtain a mixed solution;

[0016] Step 3: adding the chelate to the mixed solution and stirring evenly to obtain a chelate mixed solution;

[0017] Step 4: Add the microbial agent to the chelating mixed solution, stir and let it stand for 24 hours to ensure that the microbial agent is fully activated;

[0018] Step 5: Add stabilizer and water-soluble vitamins, stir evenly, make sure the stabilizer and water-soluble vitamins are evenly distributed in the solution, and ensure they are completely dissolved;

[0019] Step 6: Finally, add a pH regulator to adjust the pH value of the solution to between 5.5 and 7.5, and ensure that the pH value is stable to obtain an initial nutrient solution;

[0020] Step 7: Filter the prepared nutrient solution through a filter to remove residual insoluble matter;

[0021] Step 8: sterilize the filtered nutrient solution to obtain the finished nutrient solution.

[0022] As a further improvement of the present invention, the filter adopts a 0.2 micron microporous membrane filter; the sterilization treatment adopts a high-temperature steam sterilization method, the sterilization temperature is 120-125°C, and the time is 15-20 minutes.

[0023] Beneficial effects of the present invention: (1) Simple ingredients and controllable costs: The vegetable selenium-enriched nutrient solution provided by the present invention optimizes the ingredient ratio, not only selects simple and easily available raw materials, but also reduces the complex operations and equipment dependence in the preparation process, thereby reducing production costs.

[0024] (2) Increasing the selenium content of vegetables and promoting their healthy growth: The present invention can effectively promote the absorption and utilization of selenium by vegetables by adding selenide, trace element mixture, microbial agents and other ingredients in specific proportions, thereby significantly increasing the selenium content of vegetable products and enhancing their nutritional value.

[0025] (3) Environmental protection and sustainability: The present invention focuses on environmental protection and resource conservation. Environmentally friendly materials and methods are used in the preparation process. For example, disodium EDTA or ammonium ferric citrate is used as a chelate, which can effectively avoid soil pollution and ensure the safety of the ecological environment. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] The invention provides a selenium-enriched vegetable nutrient solution, which is composed of the following raw material components in parts by weight: 1-10 parts of selenide, 0.05-0.5 parts of chelate, 0.01-1 parts of microbial agent, 0.1-1 parts of trace element mixture, 0.05-3 parts of stabilizer, 0.01-0.05 parts of water-soluble vitamins, 88-98 parts of water and a pH regulator.

[0028] In the present invention, the selenide is one of water-soluble sodium selenite and selenomethionine. The chelate is one of disodium EDTA and ammonium ferric citrate. The microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus, and actinomycetes. The trace element mixture contains essential trace elements of iron, zinc, copper, and manganese for plants, wherein the ratio of iron, zinc, copper, and manganese is 3:2:1:2. The stabilizer is one of polyvinyl alcohol, sodium polyacrylate, and mannitol. The pH regulator is one of citric acid and sodium hydroxide, and the pH value is controlled between 5.5 and 7.5. The water-soluble microorganism is a mixture of vitamin B1, vitamin B2, vitamin B6, vitamin B12, and vitamin C.

[0029] A method for preparing a vegetable selenium-enriched nutrient solution comprises the following steps:

[0030] Step 1: weigh various raw material components according to the above weight parts;

[0031] Step 2: Add the selenide and trace element mixture into water, stir and dissolve them thoroughly to obtain a mixed solution;

[0032] Step 3: adding the chelate to the mixed solution and stirring evenly to obtain a chelate mixed solution;

[0033] Step 4: Add the microbial agent to the chelating mixed solution, stir and let it stand for 24 hours to ensure that the microbial agent is fully activated;

[0034] Step 5: Add stabilizer and water-soluble vitamins, stir evenly, make sure the stabilizer and water-soluble vitamins are evenly distributed in the solution, and ensure they are completely dissolved;

[0035] Step 6: Finally, add a pH regulator to adjust the pH value of the solution to between 5.5 and 7.5, and ensure that the pH value is stable to obtain an initial nutrient solution;

[0036] Step 7: Filter the prepared nutrient solution through a 0.2 micron microporous membrane filter to remove residual insoluble matter;

[0037] Step 8: Sterilize the filtered nutrient solution by high-temperature steam sterilization at a temperature of 120-125°C for 15-20 minutes to obtain the finished nutrient solution.

[0038] Embodiment 1:

[0039] Raw material components: 5 parts of sodium selenite; 0.1 parts of disodium EDTA; 0.05 parts of microbial agent; 0.8 parts of trace element mixture (0.3 parts of iron, 0.2 parts of zinc, 0.1 parts of copper, 0.2 parts of manganese); 1 part of polyvinyl alcohol; 0.05 parts of water-soluble vitamins; 93.33 parts of water; citric acid, sodium hydroxide.

[0040] Preparation steps

[0041] (i) Weighing raw materials: Weigh various raw material components according to the above weight proportions.

[0042] (ii) Mixing selenide and trace elements: Add 5 parts of sodium selenite and 0.8 parts of trace element mixture to 93.33 parts of water, stir thoroughly to dissolve, and prepare a mixed solution.

[0043] (III) Adding chelate: Add 0.1 parts of disodium EDTA to the above mixed solution, stir evenly, and prepare a chelate mixed solution.

[0044] (iv) Adding microbial agents: Add 0.05 parts of microbial agents to the chelating mixed solution, stir and let stand for 24 hours to ensure that the microbial agents are fully activated.

[0045] (V) Adding stabilizers and water-soluble vitamins: Add 1 part of polyvinyl alcohol and 0.05 parts of water-soluble vitamins to the solution, stir evenly to make the stabilizer and water-soluble vitamins evenly distributed in the solution, and ensure complete dissolution.

[0046] (VI) Adjusting pH value: Finally, add appropriate amount of citric acid to adjust the pH value of the solution to 6.0 and ensure that the pH value is stable to obtain the initial nutrient solution.

[0047] (VII) Filtration: Filter the prepared nutrient solution through a 0.2 micron microporous membrane filter to remove residual insoluble matter.

[0048] (VIII) Sterilization: The filtered nutrient solution is subjected to high-temperature steam sterilization at a temperature of 120°C for 19 minutes to obtain a finished nutrient solution.

[0049] The finished nutrient solution prepared in the above-mentioned embodiment 1 can be widely used in the planting process of various vegetables. It can be applied by spraying, irrigation, etc., which can significantly increase the selenium content of vegetables and promote the healthy growth of vegetables.

[0050] Example 2

[0051] Raw material components: 7 parts of selenomethionine; 0.3 parts of ammonium ferric citrate; 0.1 parts of microbial agent; 0.6 parts of trace element mixture; 2 parts of sodium polyacrylate; 0.03 parts of water-soluble vitamins; 90.92 parts of water; citric acid and sodium hydroxide.

[0052] Preparation steps

[0053] (i) Weighing raw materials: Weigh various raw material components according to the above weight proportions.

[0054] (ii) Mixing selenide and trace elements: Add 7 parts of selenomethionine and 0.6 parts of a mixture of trace elements to 90.92 parts of water, stir thoroughly to dissolve, and prepare a mixed solution.

[0055] (iii) Adding chelate: adding 0.3 parts of ammonium ferric citrate to the above mixed solution, stirring evenly, to obtain a chelate mixed solution.

[0056] (iv) Adding microbial agents: Add 0.1 parts of microbial agents into the chelating mixed solution, stir and let stand for 24 hours to ensure that the microbial agents are fully activated.

[0057] (V) Adding stabilizers and water-soluble vitamins: Add 2 parts of sodium polyacrylate and 0.03 parts of water-soluble vitamins to the solution, stir evenly to make the stabilizer and water-soluble vitamins evenly distributed in the solution, and ensure complete dissolution.

[0058] (VI) Adjusting pH value: Finally, add appropriate amount of sodium hydroxide to adjust the pH value of the solution to 7.0 and ensure that the pH value is stable to obtain the initial nutrient solution.

[0059] (VII) Filtration: Filter the prepared nutrient solution through a 0.2 micron microporous membrane filter to remove residual insoluble matter.

[0060] (VIII) Sterilization: The filtered nutrient solution is sterilized by high-temperature steam at a temperature of 122°C for 18 minutes to obtain a finished nutrient solution.

[0061] The finished nutrient solution prepared in the above-mentioned embodiment 2 can be widely used in the planting process of various vegetables. It can be applied by spraying, irrigation, etc., which can significantly increase the selenium content of vegetables and promote the healthy growth of vegetables.

[0062] Embodiment 3:

[0063] Raw material components: 6 parts of sodium selenite; 0.4 parts of disodium EDTA; 0.5 parts of microbial agent; 0.5 parts of trace element mixture; 1.5 parts of mannitol; 0.02 parts of water-soluble vitamins; 91.53 parts of water; citric acid and sodium hydroxide.

[0064] Preparation steps

[0065] (i) Weighing raw materials: Weigh various raw material components according to the above weight proportions.

[0066] (ii) Mixing selenide and trace elements: Add 6 parts of sodium selenite and 0.5 parts of trace element mixture to 91.53 parts of water, stir thoroughly to dissolve, and prepare a mixed solution.

[0067] (iii) Adding chelate: Add 0.4 parts of disodium EDTA to the above mixed solution, stir evenly, and prepare a chelate mixed solution.

[0068] (iv) Adding microbial agents: Add 0.5 parts of microbial agents to the chelating mixed solution, stir and let stand for 24 hours to ensure that the microbial agents are fully activated.

[0069] (V) Adding stabilizers and water-soluble vitamins: Add 1.5 parts of mannitol and 0.02 parts of water-soluble vitamins to the solution, stir evenly to make the stabilizers and water-soluble vitamins evenly distributed in the solution, and ensure complete dissolution.

[0070] (VI) Adjusting pH value: Finally, add appropriate amount of sodium hydroxide to adjust the pH value of the solution to 6.5, and ensure that the pH value is stable to obtain the initial nutrient solution.

[0071] (VII) Filtration: Filter the prepared nutrient solution through a 0.2 micron microporous membrane filter to remove residual insoluble matter.

[0072] (VIII) Sterilization: The filtered nutrient solution is sterilized by high-temperature steam at a temperature of 125°C for 16 minutes to obtain a finished nutrient solution.

[0073] The finished nutrient solution prepared in the above-mentioned embodiment 3 can be widely used in the planting process of various vegetables. It can be applied by spraying, irrigation, etc., which can significantly increase the selenium content of vegetables and promote the healthy growth of vegetables.

[0074] Performance Testing

[0075] In order to verify the performance of the prepared vegetable selenium-enriched nutrient solution, the nutrient solutions prepared in Examples 1 to 3 were subjected to detailed testing and effect evaluation. The following is a table of test results, including the stability, effectiveness (increased selenium content in vegetables), microbial activity, and safety of the nutrient solution.

[0076]

[0077]

[0078] Performance test analysis

[0079] 1. Stability

[0080] (1) Amount of sediment: After 6 months of storage, the amount of sediment in the three groups of examples was relatively small, indicating that the nutrient solution had good physical stability and storage stability.

[0081] (2) Active ingredient loss rate: The active ingredient loss rate after 6 months was between 3% and 4%, indicating that the active ingredient loss of the nutrient solution during storage was small and could maintain a high activity.

[0082] (II) Effectiveness

[0083] (1) Selenium content of vegetables before application: The selenium content of vegetables before application was very low, ranging from 0.16 to 0.17 μg / kg.

[0084] (2) Selenium content in vegetables after application: After application, the selenium content in vegetables increased significantly, reaching 48.27 μg / kg, 50.74 μg / kg and 48.65 μg / kg, respectively. The increase rates of selenium content were 30169%, 31713% and 28618%, respectively. The effect was very significant.

[0085] (3) Yield increase rate: After applying the nutrient solution, the yield increase rates of vegetables were 22.3%, 24.1% and 23.8%, respectively, indicating that the nutrient solution not only increased the selenium content of vegetables, but also promoted the growth of vegetables.

[0086] (III) Microbial activity

[0087] Total colony count: After 6 months of storage, the total colony count of the microbial inoculant was still high, at 8.56×10 8 CFU / mL, 9.27×10 8CFU / mL and 8.89×10 8 CFU / mL, indicating that the microbial agent has good survival and activity in the nutrient solution.

[0088] (IV) Safety

[0089] (1) Residual selenium in the soil: The residual selenium levels in the soil after application were low, at 0.05 mg / kg, 0.05 mg / kg, and 0.04 mg / kg, respectively. This indicates that the selenide in the nutrient solution is effectively absorbed by the plants and will not cause long-term pollution to the soil.

[0090] (2) Soil pH change: After application, the soil pH changed between 0.17 and 0.21, with little change, indicating that the nutrient solution has little effect on the acid-base balance of the soil and will not destroy the ecological balance of the soil.

[0091] (3) Side effects on vegetable growth: After application, no obvious side effects were observed in the vegetables, and the growth condition was good.

[0092] (4) Heavy metal content in vegetables: After application, the heavy metal content in vegetables was not detected, indicating that there was no harmful heavy metal residue in the nutrient solution and it was relatively safe.

[0093] Through the above performance tests, the vegetable selenium-enriched nutrient solution provided by the present invention has simple ingredients, is easy to prepare, and has controllable costs; the nutrient solution has good stability and effectiveness during storage, can significantly increase the selenium content of vegetables, and promote the healthy growth of vegetables; the nutrient solution is environmentally friendly, will not cause long-term pollution to the soil, and will not cause side effects to vegetables; there is no harmful heavy metal residue in the nutrient solution, it is highly safe, and meets the requirements of environmental protection and sustainable development.

[0094] In summary, the vegetable selenium-enriched nutrient solution and preparation method thereof of the present invention are not only suitable for large-scale vegetable planting, but also can play a significant role in home gardening and small farms. Through multiple tests and user feedback, it is confirmed that it shows good adaptability and stability under different climate and soil conditions. In addition, the nutrient solution is easy to use, and only needs to be sprayed or irrigated according to the recommended dosage, without the need for additional complicated operating steps, which greatly facilitates the daily management of users.

[0095] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vegetable selenium-enriched nutrient solution, characterized in that: The invention is composed of the following raw material components in parts by weight: 1-10 parts of selenide, 0.05-0.5 parts of chelate, 0.01-1 parts of microbial agent, 0.1-1 parts of trace element mixture, 0.05-3 parts of stabilizer, 0.01-0.05 parts of water-soluble vitamins, 88-98 parts of water and pH regulator.

2. A vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The selenide is one of water-soluble sodium selenite and selenomethionine.

3. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The chelate is one of disodium EDTA and ammonium ferric citrate.

4. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus and actinomycetes.

5. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The trace element mixture contains essential trace elements for plants, namely iron, zinc, copper and manganese, wherein the ratio of iron, zinc, copper and manganese is 3:2:1:

2.

6. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The stabilizer is one of polyvinyl alcohol, sodium polyacrylate and mannitol.

7. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The pH regulator is one of citric acid and sodium hydroxide, and the pH value is controlled between 5.5 and 7.

5.

8. The vegetable selenium-enriched nutrient solution according to claim 1, characterized in that: The water-soluble microorganism is a mixture of vitamin B1, vitamin B2, vitamin B6, vitamin B12 and vitamin C.

9. A method for preparing a selenium-enriched vegetable nutrient solution, characterized in that: The following steps are involved: Step 1: weigh various raw material components according to the above weight parts; Step 2: Add the selenide and trace element mixture into water, stir and dissolve them thoroughly to obtain a mixed solution; Step 3: adding the chelate to the mixed solution and stirring evenly to obtain a chelate mixed solution; Step 4: Add the microbial agent to the chelating mixed solution, stir and let it stand for 24 hours to ensure that the microbial agent is fully activated; Step 5: Add stabilizer and water-soluble vitamins, stir evenly, make sure the stabilizer and water-soluble vitamins are evenly distributed in the solution, and ensure they are completely dissolved; Step 6: Finally, add a pH regulator to adjust the pH value of the solution to between 5.5 and 7.5, and ensure that the pH value is stable to obtain an initial nutrient solution; Step 7: Filter the prepared nutrient solution through a filter to remove residual insoluble matter; Step 8: sterilize the filtered nutrient solution to obtain the finished nutrient solution.

10. The method for preparing a vegetable selenium-enriched nutrient solution according to claim 9, characterized in that: The filter adopts a 0.2 micron microporous membrane filter; the sterilization treatment adopts a high-temperature steam sterilization method, the sterilization temperature is 120-125° C., and the time is 15-20 minutes.

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