Abstract
The influence of six pesticides, applied singly or in combination, on 15N 2 incorporation and C 2H 2 reduction in a submerged paddy soil was studied under laboratory conditions. While the application of diazinon had no marked effect, benomyl, carbofuran, parathion, nitrofen and γ-HCH, at concentrations close to recommended field application rates (5μg −1) significantly stimulated N 2 fixation. Synergistic stimulatory effects of the pesticides on N 2 fixation were evident particularly in combinations of carbofuran with benomyl, nitrofen and γ-HCH. On the contrary, diazinon slightly retarded the stimulatory effect of benomyl and carbofuran. Results indicated that the differential effects of pesticides on N 2 fixation could be attributed partly to fluctuations in the population of certain groups of N 2 fixers in submerged soil.
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