Preparation method of multifunctional slow-release fertilizer

A multifunctional slow-release fertilizer, prepared by using iron tailings powder as a carrier and a bio-based composite coating, overcomes the shortcomings of existing slow-release fertilizers in terms of mechanical stability and nutrient release, achieving efficient nutrient supply for tuber crops such as yam and improving the yield and quality of yam.

CN122079700APending Publication Date: 2026-05-26SHANDONG ACADEMY OF AGRICULTURAL SCIENCES
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Patent Information

Application Number
CN202610206095.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-12
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing slow-release fertilizers are insufficient in terms of mechanical stability, nutrient loading, and response to changes in the crop rhizosphere environment, making it difficult to meet the needs of precision planting of tuber crops such as yam and the requirements of green agricultural development.

Method used

A carrier was prepared using iron tailings powder. A layered double hydroxide carrier was formed by acid leaching, co-precipitation and calcination. A composite coating was constructed by combining nanocellulose whiskers and sodium alginate-polyacrylic acid double network gel with calcium chloride-chitosan crosslinking system. Multifunctional slow-release fertilizer was prepared using fluidized bed coating technology.

Benefits of technology

This technology has developed a low-cost, nutrient-rich, and slow-release fertilizer with excellent mechanical stability. It can accurately respond to the rhizosphere environment of crops, thereby improving the yield and quality of yams.

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Abstract

The invention discloses a preparation method of a multifunctional slow-release fertilizer. The preparation method comprises the following steps: firstly, co-precipitating iron tailing pickle liquor and aluminum salt, and calcining to prepare a porous carrier; loading the nutrient solution on a carrier, drying and granulating to obtain fertilizer granules; nano cellulose whiskers, sodium alginate, polyacrylic acid and fumed silica are mixed to prepare a bio-based composite coating precursor solution, a calcium chloride-chitosan solution is used as a cross-linking agent to prepare fertilizer particles, finally, a fluidized bed coating technology is adopted, the coating precursor solution and a cross-linking agent solution are sequentially sprayed on the surfaces of the fertilizer particles, and the bio-based composite coating fertilizer is obtained. And spraying twice and drying to obtain the multifunctional slow-release fertilizer. The multifunctional slow-release fertilizer is prepared by combining industrial solid waste recycling carrier preparation, bio-based composite coating construction and rhizosphere response type slow-release design, and the fertilizer is low in preparation cost, rich in nutrition, good in slow-release performance and excellent in mechanical stability.
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