Abstract

Thiophosphoryl triamide inhibits soil urease activity when added to soil and is under consideration as a fertilizer amendment for retarding hydrolysis of urea fertilizer by soil urease. Work reported showed that this compound is a poor inhibitor of jackbean urease and that its ability to retard soil urease activity is due to its decomposition in soil with formation of phosphoryl triamide, which is a potent inhibitor of urease activity. This conclusion was supported by studies showing a close relationship between the peak area of the 31P-nuclear magnetic resonance (NMR) signal from phosphoryl triamide in thiophosphoryl triamide solutions that had been incubated with soil for various times and the ability of these solutions to inhibit jackbean urease activity.

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