Abstract
Comparison of the effects of N-(n-butyl) thiophosphoric triamide (NBPT) and phenylphosphorodiamidate (PPD) on hydrolysis of urea by plant (jackbean), microbial (Bacillus pasteurii), and soil urease showed that whereas NBPT was considerably more effective than PPD for inhibiting hydrolysis of urea added to soil, it was much less effective than PPD for inhibiting hydrolysis of urea by plant or microbial urease. Studies to account for this observation indicated that NBPT is rapidly decomposed in soil to a compound that is much more effective than NBPT for inhibition of urease activity and that this compound is N-(n-butyl) phosphoric triamide.
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