Abstract
Abstract The persistence of the inhibitory effects of three phosphoroamides [N‐(n‐butyl) thiophosphoric triamide (NBPT), phenylphosphorodiamidate (PPD), and thiophosphoryl triamide (TPT)] on urea hydrolysis in soils was assessed by measuring the ability of four soils to hydrolyze urea after they had been treated with 5 μg phosphoroamide/g soil and incubated at 15°C or 30°C for 0, 3, 7, 14, or 28 days. The soils used differed markedly in pH, texture, and organic‐matter content. The data obtained showed that the persistence of the effects of the phosphoroamides studied decreased with increase in soil temperature from 15°C to 30°C and that whereas the effect of PPD decreased with increase in the time of incubation, the effects of NBPT and TPT sometimes increased before decreasing with increased time of incubation. These observations are in harmony with the recent findings that PPD is a potent inhibitor of urease activity, but decomposes in soils with formation of phenol, which is a relatively weak inhibitor ...
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