Effects of parathion and malathion on transformations of urea and ammonium sulfate nitrogen in soils |
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Authors: | K L Sahrawat |
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Institution: | (1) Division of Agricultural Chemicals, Indian Agricultural Research Institute, 110 012 New Delhi, India;(2) Present address: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), 1-11-256, Begumpet, 500 016 Hyderabad, A.P., India |
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Abstract: | Summary 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.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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Keywords: | Inhibition Nitrification Sandy loam Urea hydrolysis Urease |
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