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