Abstract

Benthiocarb (S-p-chlorobenzyl diethylthiocarbamate) affected microbiological processes and growth of rice plant as follows: The herbicide enhanced the increase in numbers of heterotrophic bacteria by eight times, but sometimes in high doses caused a decline in numbers of autotrophs. Numbers of nitrifying bacteria increased after water-drainage. Large amounts (10 x recommended rate) of the herbicide stimulated the initial decrease in the amount of ammonium-N. The herbicide dissipated after water-logging and its decrease was most marked in July followed by the accumulation of dechlorinated benthiocarb in the soil applied with large amount of the herbicide. Yield components of rice plant differed markedly between the soil applied with a large amount of and that with the recommended rate of the herbicide.

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