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Effects of three herbicides on soil microbial biomass and activity


, : Effects of three herbicides on soil microbial biomass and activity. Plant & Soil 122(1): 21-28

Three post-emergence herbicides (2,4-D, picloram were glyphosate) were applied to samples of an Alberta [Canada] agricultural soil at concentrations of 0, 2, 20, and 200 .mu.g g-1. The effects of these chemicals on certain microbial variables was monitored over 27 days. All herbicides caused enhancement of basal respiration but only for 9 days following application, and only for concentrations of 200 .mu.g g-1. Substrate-induced respiration was temporarily depressed by 200 .mu.g g-1 picloram and 2,4-D and briefly enhanced by 200 .mu.g g-1 glyphosate. It is concluded that because changes in microbial variables only occurred at herbicide concentrations of much higher than that which occurs following field application, the side-effects of these chemicals is probably of little ecological significance.

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Accession: 001820626

DOI: 10.1007/bf02851906

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