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

Sahrawat, K L (1979) Effects of parathion and malathion on transformations of urea and ammonium sulfate nitrogen in soils. Plant and Soil, 53 (1-2). pp. 11-16. ISSN 0032-079X

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Abstract

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.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Inhibition - Nitrification - Sandy loam - Urea hydrolysis - Urease
Subjects:	Others > Soil Science Others > Fertilizer Applications
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	16 Nov 2011 09:40
Last Modified:	16 Nov 2011 09:40
URI:	http://oar.icrisat.org/id/eprint/3984
Official URL:	http://dx.doi.org/10.1007/BF02181874
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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