Multi-nutrient slow-release fertilizer and preparation method thereof
By forming a stable envelope layer on the fertilizer and using the technical means of multi-nutrient slow-release fertilizer, the problem of mismatching the nutrient release rate of traditional fertilizers and crop growth needs is solved, and the uniform and stable release of nutrients is achieved, the risks of fertilizer waste and pollution are reduced, and crop yield and quality are improved.
Patent Information
- Application Number
- CN202510181242.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-05-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The nutrient release rate of traditional fertilizers is difficult to accurately match the growth needs of crops, resulting in waste of fertilizer, soil and water pollution, and increased labor and input costs.
Multi-nutrient sustained release fertilizer is used, and its envelope solution is composed of polymeric amino acids, glues, urea, zinc sulfate, magnesium sulfate and other components. A stable envelope layer is formed through spraying and oxidation drying processes to control the sustained release of nutrients.
The matching of nutrient release with crop growth needs is achieved, reducing fertilizer waste and soil pollution, reducing fertilization costs, and improving crop yield and quality.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of modern agriculture, and in particular to a multi-nutrient slow-release fertilizer and a preparation method thereof. Background Art
[0002] In modern agricultural production, the rational use of fertilizers plays a key role in improving crop yield and quality. Traditional fertilizers, such as ordinary nitrogen, phosphorus and potassium compound fertilizers, can provide basic nutrients for crops, but they have many limitations. The nutrient release rate is often difficult to accurately match the growth needs of crops, and it also increases the leaching loss of nutrients, which not only pollutes the soil and water environment, but also reduces the utilization rate of fertilizers, requiring farmers to fertilize frequently to meet the nutrient needs of crops in the subsequent growth stage, which undoubtedly increases labor costs and the overall input cost of fertilizers. Summary of the invention
[0003] One of the objects of the present invention is to provide a multi-nutrient slow-release fertilizer and a preparation method thereof.
[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a multi-nutrient slow-release fertilizer and a preparation method thereof, comprising a coating liquid and a basic nitrogen, phosphorus and potassium fertilizer: the coating liquid comprises 0.1-5.0 parts of polymerized amino acids, 0.5-2.0 parts of glue, 4.0-16.0 parts of urea, 0.5-3.0 parts of zinc sulfate, 3.0-11.0 parts of magnesium sulfate, 0.5-3.0 parts of manganese sulfate, 0.5-8.0 parts of ferrous sulfate, 0.5-2.0 parts of copper sulfate, 0.5-1.0 parts of boric acid, 0.1-0.5 parts of ammonium molybdate, 2.0-3.5 parts of chelating agent, and 87.8-45 parts of water; the basic nitrogen, phosphorus and potassium fertilizer comprises large-particle urea, drum-granulated compound fertilizer, and high-tower granulated compound fertilizer.
[0005] Preferably, the coating solution formula of the coated urea is 2.0 parts of polyglutamic acid, 1.0 part of gelatin, 15 parts of urea, 5 parts of magnesium sulfate, 0.5 parts of zinc sulfate, 0.5 parts of manganese sulfate, 2.5 parts of ferrous sulfate, 0.3 parts of copper sulfate, 0.3 parts of boric acid, 0.1 parts of ammonium molybdate, 2.5 parts of disodium EDTA, and the rest is added with an appropriate amount of water until the total amount reaches 100 parts.
[0006] Preferably, the polymerized amino acid specifically includes one of polyglutamic acid and polyaspartic acid or a mixture of the two in a specific ratio. The polymerized amino acid includes one of polyglutamic acid and polyaspartic acid or a mixture of the two. The type of glue includes one of bone glue, hide glue, gelatin, carrageenan or a mixture of the two in a specific ratio. The chelating agent includes one of disodium EDTA and citric acid or a mixture of the two.
[0007] Preferably, the coating solution is prepared by the following process: accurately weigh appropriate amounts of polymerized amino acids and glue and place them in a dedicated reaction container, then add an appropriate amount of water, turn on the stirring device and heat at the same time, raise the temperature to 60 degrees Celsius, and continue stirring at this temperature until the polymerized amino acids and glue are fully dissolved to form a uniform solution system, add urea, magnesium sulfate, zinc sulfate, manganese sulfate, ferrous sulfate, copper sulfate, boric acid, ammonium molybdate and other ingredients in a predetermined order, continue stirring until all added ingredients are completely dissolved to ensure that the various nutrients in the solution are evenly distributed, add the chelating agent and the remaining water, heat the solution to 80 degrees Celsius again, and keep it warm at this temperature for 30 to 60 minutes.
[0008] Preferably, the prepared coating liquid is evenly sprayed on the surface of the fertilizer particles through a spray gun to ensure that each fertilizer particle is fully covered by the coating liquid to form a uniform and stable coating layer. After oxidative drying treatment, under appropriate temperature and ventilation conditions, the finished fertilizer is obtained after oxidative drying.
[0009] Compared with the prior art, the present invention has the following beneficial effects:
[0010] (1) The present invention provides a comprehensive and balanced nutrient supply for crops through the synergistic effect of formula and multiple nutrients, avoiding the defect of single fertilizer with single nutrient, and helping to improve the yield and quality of crops. The presence of the coating makes the nutrient release of the fertilizer match the growth requirements of the crop, reducing the waste of fertilizer and the labor cost of frequent fertilization, while reducing the risk of soil pollution and water eutrophication caused by excessive fertilization. At the same time, the rich supply of trace elements helps to improve the nutritional status of crops, enhance the stress resistance of crops, reduce the occurrence of diseases and pests caused by deficiency, and further ensure the healthy growth and high and stable yield of crops. The uniform spraying and oxidative drying process can ensure that each grain of fertilizer has good coating quality and slow-release performance, ensuring the uniformity and stability of nutrient release when the fertilizer is used in the field, and avoiding the adverse effects of excessive or low local nutrient concentration on crop growth. The multi-nutrient slow-release fertilizer prepared in this way can continuously and stably supply nutrients in the soil according to the growth needs of crops, reduce nutrient leaching, volatilization and fixation losses, improve fertilizer utilization efficiency, reduce fertilization costs, and reduce pollution to the soil and environment. DETAILED DESCRIPTION
[0011] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.
[0012] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.
[0013] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0014] One of the preferred embodiments of the present invention is a multi-nutrient slow-release fertilizer and a preparation method thereof, comprising a coating liquid and a basic nitrogen, phosphorus and potassium fertilizer: the coating liquid comprises 0.1 to 5.0 parts of polymerized amino acids, 0.5 to 2.0 parts of glue, 4.0 to 16.0 parts of urea, 0.5 to 3.0 parts of zinc sulfate, 3.0 to 11.0 parts of magnesium sulfate, 0.5 to 3.0 parts of manganese sulfate, 0.5 to 8.0 parts of ferrous sulfate, 0.5 to 2.0 parts of copper sulfate, 0.5 to 1.0 parts of boric acid, 0.1 to 0.5 parts of ammonium molybdate, 2.0 to 3.5 parts of a chelating agent, and 87.8 to 45 parts of water; the basic nitrogen, phosphorus and potassium fertilizer comprises large-particle urea, a drum-granulated compound fertilizer, and a high-tower-granulated compound fertilizer.
[0015] The coating solution formula of coated urea is 2.0 parts of polyglutamic acid, 1.0 parts of gelatin, 15 parts of urea, 5 parts of magnesium sulfate, 0.5 parts of zinc sulfate, 0.5 parts of manganese sulfate, 2.5 parts of ferrous sulfate, 0.3 parts of copper sulfate, 0.3 parts of boric acid, 0.1 parts of ammonium molybdate, 2.5 parts of disodium EDTA, and add an appropriate amount of water to the rest until the total amount reaches 100 parts.
[0016] The polymerized amino acid specifically includes one of polyglutamic acid and polyaspartic acid or a mixture of the two in a specific ratio. The polymerized amino acid includes one of polyglutamic acid and polyaspartic acid or a mixture of the two. The types of glue include one of bone glue, hide glue, gelatin and carrageenan or a mixture of the two in a specific ratio. The chelating agent includes one of disodium EDTA and citric acid or a mixture of the two.
[0017] The coating solution is prepared by the following process: accurately weigh appropriate amounts of polymerized amino acids and glue and place them in a dedicated reaction container, then add an appropriate amount of water, turn on the stirring device and heat at the same time, raise the temperature to 60 degrees Celsius, and continue stirring at this temperature until the polymerized amino acids and glue are fully dissolved to form a uniform solution system, add urea, magnesium sulfate, zinc sulfate, manganese sulfate, ferrous sulfate, copper sulfate, boric acid, ammonium molybdate and other ingredients in a given order, continue stirring until all added ingredients are completely dissolved to ensure that the various nutrients in the solution are evenly distributed, add the chelating agent and the remaining water, heat the solution to 80 degrees Celsius again, and keep it warm at this temperature for 30 to 60 minutes.
[0018] The prepared coating liquid is evenly sprayed on the surface of the fertilizer particles through a spray gun to ensure that each fertilizer particle is fully covered by the coating liquid to form a uniform and stable coating layer. After oxidative drying under appropriate temperature and ventilation conditions, the finished fertilizer is obtained.
[0019] Working principle:
[0020] When in use, the coating liquid is combined with basic nitrogen, phosphorus and potassium fertilizers. As the core nutrient source, basic nitrogen, phosphorus and potassium fertilizers provide a large number of elements such as nitrogen, phosphorus and potassium for crop growth. The various components in the coating liquid are attached to the surface of the basic fertilizer particles through a specific coating process to form a coating with a slow-release function. Among them, the polymerized amino acid has strong water absorption and water retention, can combine with water molecules in the soil, regulate the soil moisture around the fertilizer, and its molecular structure can adsorb and fix nutrient ions to reduce nutrient leaching losses; the gum material plays an adhesion and molding role in the coating process, so that the coating can tightly wrap the fertilizer particles, urea, zinc sulfate, magnesium sulfate, manganese sulfate, ferrous sulfate, copper sulfate, etc., as well as boric acid, ammonium molybdate and other ingredients provide the necessary trace elements for crop growth. These elements are slowly released under the control of the coating to meet the needs of crops for various nutrients at different growth stages; the chelating agent can form a stable chelate with metal ions to prevent metal ions from being fixed in the soil, improve the effectiveness of trace elements and the utilization rate of fertilizers;
[0021] As a kind of polymerized amino acid, polyglutamic acid has a unique molecular chain structure that can form hydrogels in the soil, absorb a large amount of water and wrap fertilizer particles, slowing down the dissolution rate of fertilizers. Gelatin, as a colloid substance, cooperates with polyglutamic acid to enhance the toughness and sealing of the coating. Urea, as a nitrogen source, slowly decomposes and releases nitrogen under the control of the coating. Metal salts such as magnesium sulfate and zinc sulfate, as well as trace elements such as boric acid and ammonium molybdate, are maintained in an effective state that can be absorbed by crops under the action of disodium EDTA chelating agent. With the gradual degradation of the coating and the penetration of water, they are released into the soil in an orderly manner according to the needs of crops, providing a continuous supply of nutrients for crops.
[0022] The above describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.
Claims
1. A multi-nutrient slow-release fertilizer and a preparation method thereof, characterized in that: The invention comprises a coating liquid and a basic nitrogen, phosphorus and potassium fertilizer: the coating liquid comprises 0.1 to 5.0 parts of polymerized amino acid, 0.5 to 2.0 parts of glue, 4.0 to 16.0 parts of urea, 0.5 to 3.0 parts of zinc sulfate, 3.0 to 11.0 parts of magnesium sulfate, 0.5 to 3.0 parts of manganese sulfate, 0.5 to 8.0 parts of ferrous sulfate, 0.5 to 2.0 parts of copper sulfate, 0.5 to 1.0 parts of boric acid, 0.1 to 0.5 parts of ammonium molybdate, 2.0 to 3.5 parts of a chelating agent and 87.8 to 45 parts of water; the basic nitrogen, phosphorus and potassium fertilizer comprises large-particle urea, a compound fertilizer granulated by a drum and a compound fertilizer granulated by a high tower.
2. A multi-nutrient slow-release fertilizer and a preparation method thereof as claimed in claim 1, characterized in that: The coating solution formula of the coated urea is 2.0 parts of polyglutamic acid, 1.0 parts of gelatin, 15 parts of urea, 5 parts of magnesium sulfate, 0.5 parts of zinc sulfate, 0.5 parts of manganese sulfate, 2.5 parts of ferrous sulfate, 0.3 parts of copper sulfate, 0.3 parts of boric acid, 0.1 parts of ammonium molybdate, 2.5 parts of disodium EDTA, and an appropriate amount of water is added to the rest until the total amount reaches 100 parts.
3. A multi-nutrient slow-release fertilizer and a preparation method thereof as claimed in claim 1, characterized in that: The polymerized amino acid specifically includes one of polyglutamic acid and polyaspartic acid or a mixture of the two in a specific ratio. The polymerized amino acid includes one of polyglutamic acid and polyaspartic acid or a mixture of the two. The type of glue includes one of bone glue, hide glue, gelatin, carrageenan or a mixture of the two in a specific ratio. The chelating agent includes one of disodium EDTA and citric acid or a mixture of the two.
4. A multi-nutrient slow-release fertilizer and a preparation method thereof as claimed in claim 1, characterized in that: The coating solution is prepared by the following process: accurately weigh appropriate amounts of polymerized amino acids and glue and place them in a dedicated reaction container, then add an appropriate amount of water, turn on the stirring device and heat at the same time, raise the temperature to 60 degrees Celsius, and continue stirring at this temperature until the polymerized amino acids and glue are fully dissolved to form a uniform solution system, add urea, magnesium sulfate, zinc sulfate, manganese sulfate, ferrous sulfate, copper sulfate, boric acid, ammonium molybdate and other ingredients in a predetermined order, continue stirring until all added ingredients are completely dissolved to ensure that various nutrients in the solution are evenly distributed, add a chelating agent and the remaining water, heat the solution to 80 degrees Celsius again, and keep it warm at this temperature for 30 to 60 minutes.
5. A multi-nutrient slow-release fertilizer and a preparation method thereof as claimed in claim 1, characterized in that: The prepared coating liquid is evenly sprayed on the surface of the fertilizer particles through a spray gun to ensure that each fertilizer particle is fully covered by the coating liquid to form a uniform and stable coating layer. After oxidative drying under appropriate temperature and ventilation conditions, the finished fertilizer is obtained.