The invention relates to novel urease inhibited fertilizer compositions containing urea and a urease inhibiting amount of {HEAD ~ one or more diaminophosphinyl compounds} having oxidized sulfur functions, and methods and composition for inhibiting {TAIL ~ the activity} of urease through use of such compounds 
The invention relates to novel urease inhibited fertilizer compositions containing urea and a urease inhibiting amount of { HEAD ~ one or more diaminophosphinyl compounds } having oxidized sulfur functions , and methods and composition for inhibiting { TAIL ~ the activity } of urease through use of such compounds
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