A long-acting slow-release organic-inorganic compound fertilizer granule

By adopting long-term sustained-release organic and inorganic compound fertilizer particles with three-layer structure, and using materials such as polyglutamic acid, sodium hydroxymethylcellulose, guar gum and chitin oligosaccharide, the gradual slow-release of nutrients is achieved, solving the problem of slow-release fertilizer residues in the existing technology, improving crop growth effect and reducing soil slab risk.

CN119751160APending Publication Date: 2025-04-04CHONGQING GREEN AGRI DEV CO LTD
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Patent Information

Application Number
CN202411932696.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

In the prior art, the sustained-release fertilizer mainly relies on resin coatings and toxic crosslinking agents to achieve sustained-release, resulting in residual substances being easily caused by soil shaping.

Method used

Long-term sustained-release organic and inorganic compound fertilizer particles with a three-layer structure include long-term sustained-release fertilizers in the inner layer, medium-level sustained-release fertilizers and short-term sustained-release fertilizers in the outer layer. The gradual slow-release fertilizers in the outer layer are achieved through the combination of materials such as polyglutamic acid, sodium hydroxymethylcellulose, guar gum and chitin oligosaccharides.

Benefits of technology

It effectively extends the nutrient release time limit, improves the growth effect of crops, avoids the residue of resin coating and crosslinking agent, and reduces the risk of soil crumbing.

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Abstract

A long-acting slow-release organic-inorganic compound fertilizer granule is in the shape of a spherical granule, comprising an inner layer of long-acting slow-release fertilizer, a middle layer of medium-acting slow-release fertilizer, and an outer layer of short-acting slow-release fertilizer, wherein the long-acting slow-release fertilizer comprises organic-inorganic compound fertilizer, polyglutamic acid, sodium hydroxymethyl cellulose, guar gum and chitosan oligosaccharide, the medium-acting slow-release fertilizer comprises organic-inorganic compound fertilizer, polyglutamic acid, sodium hydroxymethyl cellulose and chitosan oligosaccharide, and the outer layer fertilizer comprises organic-inorganic compound fertilizer, polyglutamic acid, sodium hydroxymethyl cellulose; the granule is formed by rolling the granules layer by layer from the inside to the outside; the beneficial effect is that the nutrients in the fertilizer granules can be released from the outer layer, then to the middle layer, and then to the inner layer, thereby ensuring the gradual release of the nutrients from the hierarchical structure; the fertilizer does not contain commonly used resin coatings and cross-linking agents, thus no undesirable residual substances will be left, and the soil will not be compacted.
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