Insecticide impact on microbial activities and characteristics of arable soils BRT 540066
1999
Patcharee Saenjan (Khonkaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Department of Land Resources and Environment)
Results from impact of organophosphates insecticides on microbial activity and chemical characteristics in aerobic soils showed that all kinds of organophosphates generally had no impact on neither soil microbial activity nor content of NH4(+) in sandy, loamy and clayey soils, except metamidophos and dimethoate. Carbamate gave no impact on soil microbial activity beside application of BPMC showed strong effect on soil microbial activity in sandy soil and mild impact for loamy soil. Carbamate had no impact on content of NH4(+) in sandy and loamy soil, but gave slight impact for clayey soil. In organochlorine only chlordane showed impact on soil microbial activity in sandy soil. All organophosphates (1X and 2X) showed impact on NH4(+) content in submerged loamy soil. BPMC carbaryl and carbofuran resulted weak impact on soil microbial activity in submerged loamy soil all carbamates gave strong impact on NH4(+) content in submerged clayey soil. Organochlorines gave no impact on microbial activity in submerged loamy soil, but only slight impact for submerged clayey soil. All of organochlorines showed strong effect on content of NH4(+) in submerged loamy and clayey soil. In general, the insecticides of these 3 groups resulted in no impact on other chemical characteristics of aerobic and submerged soils. Results which showed negative meanings of tested insecticides, however, are recommended for further investigation, especially for field trials of short and long term. Those insecticides are BPMC chlordane for upland sandy soil, methyl parathion for submerged loamy and clayey soil and mevinphos for submerged clayey soil, carbaryl, BPMC and isoprocarb for submerged loamy soil, all carbamates for submerged clayey and all organochlorines for submerged loamy and clayey soil.
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