The effect of herbicides on metabolically active bacteria and fungi in soil after the first application and after application for a number of years

Paeschke, R.R.; Heitefuss, R.

Zeitschrift fur Pflanzenkrankheiten und Pflanzenschutz 85(8/9): 471-481


Accession: 000534119

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In 1968-1975, the effects on CO2 release of dinoseb acetate, monolinuron and simazine applied in the field were measured after the addition of glucose and of selective inhibitors of bacteria and fungi. In summer 1974 commercial rates of dinoseb acetate applied for the first time inhibited fungal respiration by 40%, and in soil previously treated a number of times in spring by 17%. In autumn 1974 the corresponding inhibitions were 30% and 23%, and in spring 1975 they were 30% and 23%. Inhibition persisted for at least 14 days after application. Dinoseb acetate at 10 times the commercial rate inhibited CO2 release by fungi by 80%. Even at this high rate, monolinuron and simazine did not affect CO2 release by bacteria or fungi. None of the treatments had a permanent effect on the ratio of bacteria to fungi.