Effect of Urea Coated with Urease Inhibitor (NBPT) on Rice Growth, Yield and Yield Components
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Abstract
This research was carried out to determine the effect of urea coated with N-(n-butyl)-thiophosphoric triamide (NBPT) on rice growth, yield and yield components in farmer’s field at Chiang Mai province. Rice, variety San-pah-tawng 1, was grown as farmer’s practice and applied with seven treatments of different nitrogen fertilizers including: no application of nitrogen fertilizer, application of urea coated with NBPT and without coated at 60, 90 and 120 kg N/ha. The result found that the application of coated urea with NBPT had no effect on plant growth of both stages in term of shoot dry weight, plant height, numbers of tiller per hill, SPAD value and nitrogen content in YEB and flag leaf which were increased with increasing of nitrogen rate. However, plant height at flowering stage showed no difference among nitrogen fertilizer treatments. Moreover, rice supplied with urea coated with NBPT at 120 kg N/ha gave the highest yield and yield components including grain yield, tiller number per hill and panicle number per hill. The results from this study is useful for efficient management of urea application for increasing yield productivity and reducing impact to environment.
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