Stimulation of ammonification and nitrification in soils by the insecticides monocrotophos and quinalphos.
The application (up to 5 kg ha-1) of monocrotophos or quinalphos to four types of agricultural soils significantly stimulated the mineralization of peptone-nitrogen and the oxidation of ammonium-nitrogen. In soils treated with 2.5 kg ha-1 of either insecticide, the rate of ammonification and nitrification was fairly rapid after 2 and 4 weeks of incubation. The enhancement of both transformations, mediated by microorganisms, was significantly more in the quinalphostreated soils. The results suggest that a balance between the effect of insecticides on insect pests and their impact on beneficial microbial activities in soil must be determined.
Rangaswamy
V
V
Department of Microbiology, Sri Krishnadevaraya University, Anantapur, India.
Venkateswarlu
K
K
D000641:Ammonia / Q000737:chemistry*; D007306:Insecticides; D008999:Monocrotophos / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D009946:Organothiophosphorus Compounds / Q000737:chemistry*; D012987:Soil
D007306:Insecticides; D009566:Nitrates; D009946:Organothiophosphorus Compounds; D012987:Soil; C009145:quinalphos; D008999:Monocrotophos; D000641:Ammonia