Abstract
A study of the effects of malathion and parathion applied at 10 and 50 μg/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. The 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.
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