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Preparation and Properties of Urea Slow-Release Fertilizer Hydrogel by Sodium Alginate-Gelatin Biopolymer

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Abstract:

Urea is high solubility nitrogen fertilizer. There is major nitrogen pollution in ecosystem. Slow-release nitrogen fertilizer the way to decrease nitrogen form agriculture. Slow-release nitrogen fertilizer the way to decrease nitrogen in agriculture. Slow-release formulations of nitrogen fertilizer were developed based on alginate-gelatin by using calcium chloride as the cross-linker in the egg-box model as hydrogels. Water-retaining ratio, loading behavior, and the release kinetics were examined. The release kinetic rates were investigated by Zero-order kinetic, First-order kinetic, Higuchi, Korsmeyer-Peppas, Weibull, and Hixson-Crowell models. The results showed that the S1G0.5 sample (alginate 1 g and gelatin 0.5 g) was the optimum condition for application as urea slow-release fertilizers because it was a minimal release kinetic rate for 12 hrs. These results indicate that the alginate-gelatin hydrogel can be a slow-release nutrient to plant an environmentally friendly fertilizer.

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Periodical:

Key Engineering Materials (Volume 889)

Pages:

98-103

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.889.98

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Online since:

June 2021

Authors:

Wilawan Hnoosong, Pornpairin Rungcharoenthong, Suntree Sangjan*

Keywords:

Alginate, Gelatin, Hydrogel, Slow Release Fertilizer, Urea

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© 2021 Trans Tech Publications Ltd. All Rights Reserved

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