SYNTHESIS AND PROPERTIES OF SLOW RELEASED URE FERTILIZER BASED ON POLYVINYL ALCOL AND BENTONITE

Abstract

This study is to investigate a new generation of environmentally friendly fertilizer using biodegradable binder and urea as the main nitrogen source. Slow-release urea fertilizer based on polyvinyl alcol and clay bentonit was prepared and characterized. The analysis of IR, XRD, EDX showed that the present of polyvinyl alcol and bentonit stabilized the structure of it, made the N of ure release slowly that led to the leakage of fertilizer decrease. The results revealed that the sample with ratio of mass of urea:bentonite:polyvinyl alcol is 90:10:3, in water the release of N is 65,20% in 12 hours and in soil the release of N is 80,62% in 35 days (at 250C).