MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202611102975 A) filed by Indian Council Of Agricultural Research on August 26, 2026, for Controlled-Release Phosphorus Fertilizer Composite And Method Of Preparation Thereof.
Inventors include Chatterjee, Dibyendu; Adak, Totan; Ramaiah, E Venkat; Nayak, Bitish Kumar; and Nayak, Amaresh Kumar.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: The present disclosure relates to a controlled-release phosphorus fertilizer composite and a method for preparing the same. The composite comprises 50–70 wt% of an acrylic monomer, 10–20 wt% of an amide monomer, 5–10 wt% of a layered silicate clay, 0.5–1.5 wt% of a crosslinking agent, 0.5–1.5 wt% of a polymerization initiator, 5–20 wt% of a phosphorus source, and 1–5 wt% of a low molecular weight organic acid. The phosphorus source and the organic acid are incorporated into the clay-polymer matrix during polymerization, thereby providing sustained phosphorus release and reducing phosphorus fixation in soil. The organic acid enhances phosphorus availability by chelating iron, aluminium, and calcium ions and by solubilizing sparingly soluble phosphorus sources. The composite exhibits improved water absorbency and controlled nutrient release, making it suitable for dryland and phosphorus-deficient soils. The present disclosure further provides an energy- efficient preparation method that eliminates a separate fertilizer-loading step and improves phosphorus-use efficiency, crop productivity, and environmental sustainability.
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