Self-irrigation and slow-release fertilizer hydrogels for sustainable agriculture

WO2026006823A1PCT designated stage Publication Date: 2026-01-02BOARD OF RGT THE UNIV OF TEXAS SYST
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Patent Information

Application Number
PCT/US2025/035895
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-06-28
Filing Date
2025-06-30
Publication Date
2026-01-02

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Abstract

Given the critical need for more efficient water and nutrient utilization to optimize crop yields, effective strategies in water and nutrient management are essential. The development of a self-irrigation and slow-release fertilizer hydrogel (SISRH) represents a promising approach. SISRH, a hydrogel with hygroscopic polymer chains interpenetrated by a thermo-responsive network, enhances plant growth through controlled yet self-sustained water and nutrient delivery. The hydrogel demonstrates diurnal functionality: it absorbs water vapor at night and releases it during the day due to a phase transition in the polymer, with incorporated calcium chloride (CaCl2) further improving hygroscopic properties and controlled nutrient release. SISRH facilitates a slow-release of nutrients and can achieve water savings, significantly reducing the need for frequent irrigation and ensuring robust crop development.
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