Aqueous triggered controlled-release saline-alkali soil conditioner and preparation method therefor

By preparing a water-based triggered controlled-release saline-alkali soil conditioner, and utilizing alginate/stress-resistance regulator composite microparticles and non-water-soluble alginate particles, the problems of low efficiency and high cost of saline-alkali soil conditioners in arid and rain-scarce areas have been solved, achieving efficient and environmentally friendly saline-alkali soil improvement and crop yield increase.

WO2025256009A1 Publication Date: 2025-12-18CHINA AGRI UNIV
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Patent Information

Application Number
PCT/CN2024/125419
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-06-11
Filing Date
2024-10-17
Publication Date
2025-12-18

AI Technical Summary

Technical Problem

Existing soil conditioners are inefficient and costly in arid and low-rainfall areas. Traditional conditioners require large amounts and have limited application time, and long-term use poses potential harm to the soil and environment, making them difficult to adapt to fertigation technology.

Method used

A water-based, triggered, controlled-release soil conditioner for saline-alkali land was developed. It uses alginate/stress-resistance regulator composite microparticles and non-water-soluble alginate particles to prepare micro/nano-scale powders and suspensions through a two-step gel crosslinking process. Combined with organic acids and stabilizers, it achieves multi-stage release and soil improvement, is compatible with micro-irrigation systems, and prevents equipment scaling.

Benefits of technology

It achieves fertilizer-saving, labor-saving, and water-saving soil improvement in arid and low-rainfall areas, is compatible with integrated water and fertilizer technology, improves soil improvement efficiency, reduces transportation and usage costs, reduces environmental risks, and enhances crop yield and soil activity.

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Abstract

Disclosed in the present invention are an aqueous triggered controlled-release saline-alkali soil conditioner and a preparation method therefor. The aqueous triggered controlled-release saline-alkali soil conditioner comprises agent A. The agent A comprises a water-soluble polymer and controlled-release suspended particles. The controlled-release suspended particles comprise alginate / anti-reverse regulator composite particulates. The alginate / anti-reverse regulator composite particulates are obtained by sequentially subjecting an alginate to two-step gel cross-linking by means of a cationic anti-reverse regulator and a high-valent metal ion-containing cross-linking agent. In the present invention, the alginate used as a main material is subjected to charged regulator-based high-speed dispersion for primary gelation and high-valent metal-based secondary gelation, thereby preparing a micron-nano powder and suspension, and incorporating a solvable organic polymer material, the functions of graded release and intelligent regulation of a product are achieved. The incorporation of an organic acid and a phosphoric acid material can not only prevent a micro-irrigation device from scaling but can also achieve triggered controlled-release of the material on demand and in a timely manner, thereby achieving the effects of multi-particle-size dispersion and precise release of the product in soil.
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