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A study of the effects of malathion and parathion applied at 10 and 50 g/g of soil on transformations of urea and (NH4)2SO4–N in a sandy loam showed that the insecticides retarded urea hydrolysis as well as nitrification of urea and (NH4)2SO4–N. At 50 parts/106 rate of the insecticides, inhibition of urea hydrolysis ranged from 44 to 61% after 0.5 week and from 7 to 21% after 3 weeks of application. The insecticides inhibited the conversion of NH4 + to NO2 – without appreciably affecting the subsequent oxidation of NO2 – to NO3 – –N. This resulted in accumulation of higher amounts of NH4 +–N in soil samples treated with ammonium sulfate or urea N.\udThe results suggest that transformations of urea and NH4 + fertilizers in soils may be influenced by the amount of organophosphorus insecticide present and this may affect plant nutrition and fertilizer use.\u

Effects of parathion and malathion on transformations of urea and ammonium sulfate nitrogen in soils