Fixation of Urea to Poly (Acrylamide-Maleic Acid) and Nitrogen Release Behaviour of the Product – A Comparison with Urea and Control

M. H. RAHMAN1, B. K. DAS2, M. A. J. MIAH2 and H. AHMAD2
1 Department of Crop Science and Technology, Rajshahi University, Rajshahi 6205, Bangladesh
2 Department of Chemistry, Rajshahi University, Rajshahi 6205, Bangladesh

Abstract

RAHMAN, M. H., B. K. DAS, M. A. J. MIAH and H. AHMAD, 2008. Fixation of urea to poly (acrylamide-maleic acid) and nitrogen release behaviour of the product – a comparison with urea and control. Bulg. J. Agric. Sci., 14: 373-380

The growth and yield from green chilli Capsicum annuum plants in presence of a newly prepared slow-release N-fertilizer was investigated. The slow-release fertilizer was prepared by covalently immobilizing urea on a biodegradable polymer matrix consisting of acrylamide (AAm) and maleic acid (MA). The resulting product, abbreviated as P (AAm-MA) U was characterized by FTIR and NMR spectral analyses, thin layer chromatography measurement and elemental analyses. Results showed that P (AAm-MA) U contained 32.85% N and the solvency in aqueous media reduced by 297 times as compared to urea. To clarify the performance of P (AAm-MA) U in agriculture, a comparative study was then carried out on the growth of green chilli plants using urea and control (without N-fertilizer) as the basis. P (AAm-MA) U showed improved yield in terms of average plant size over the cultivation period. The N release behaviour in soil during cropping and plant uptake of N suggested that P(AAm-MA)U can be used as slow-release N-fertilizer.

Key words: slow-release, N-fertilizer, P(AAm-MA)U, control, chilli plants

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