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Updated: Jan 20, 2026

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
pH-Responsively Water-Retaining Controlled-Release Fertilizer Using Humic Acid Hydrogel and Nano-Silica Aqueous
Yuhua Niu1, Ruyuan Ke1, Tong Yang1
1College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
Abstract:
A pH-responsively controlled-release fertilizer was prepared using humic acid (HA) hydrogel, Nanosilica aqueous dispersion (NSAD) and sodium alginate (SA). Therein, the NSAD was modified with HA owning a variety of reactive groups and good compatibility by the hydrogen bonding and playing a skeleton supporting role in the entire structural system, SA was soluble in alkaline environments thus releasing the HA. The facts showed that the gel fertilizer had a good controlled release effect and the HA was released organically in alkaline environments through structural characterization and controlled release mechanism experiments. The application test showed that the humic acid sustained-release fertilizer has obvious improvement effect on saline-alkali soil.
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