| Summary: | Finding a formula and characterization of slow-release fertilizer made of eco-friendly materials to reduce water pollution risk has been intensively studied. This study aims to explore fertilizing properties of the new formula in urea-slow-release and urea-magnesium-slow-release fertilizers on rice (Oryza sativa L, variety of mutant inpari IR-42). Stable and eco-friendly slow-release-fertilizer tablets were prepared from rice-husk-ash, liquid natural rubber, Epsom salt, and chitosan in an appropriate composition. The matrix of tablets was stable and persisted in water incubation for at least 12 days; the urea release was much slower than that from control and being comparable to the release rate in previously reported studies. The nutrient dissolution rate is in the range of plant nitrogen uptake, so that being prevented from excessive release into the environment. The Oryza sativa L absorbed the nutrient adequately indicated by high nitrogen uptake efficiency (NUE). The slow-release fertilizer significantly enhanced the number of rice tillers, leaves, panicles, and rice grain weight. The use of this slow-release fertilizer reduced nearly 75% of urea usage without reducing the grain yield. © 2021, Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma. All rights reserved.
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