Ecotoxicological aspects of soil fumigation. II. Residual effects of a field application of methyl bromide on microbial activities and their reaction to herbicides

Malkomes, H.P.

Zeitschrift fur Pflanzenkrankheiten und Pflanzenschutz 103(1): 50-63


Accession: 003103419

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Methyl bromide was applied in 1992 to a sandy loamy soil in Germany. Soil samples were collected after 2 years at 5 cm soil depth and treated in the laboratory with Flussig Herbogil (dinoterb) and Fenikan (diflufenican + isoproturon). Green manuring with lucerne meal (5 g/kg soil) was carried out, and samples were incubated for up to 12 weeks. As compared to non-fumigated soil, some biomass-related activities were still reduced after 2 years, whereas nitrogen mineralization was increased. In non-fumigated soil, both herbicides, but to a lesser extent Fenikan, inhibited biomass-related activities dose-dependently, and stimulated carbon and nitrogen mineralization. The microbial ecotoxicology of methyl bromide as well as the methods used are discussed.