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- Title
Simultaneous assessment of various responses of the soil microflora to bentazone.
- Authors
Marsh, J. A. P.; Wingfield, G. I.; Davies, Hazel A.; Grossbard, Erna
- Abstract
The effect of bentazone at 10 and 100 ppm in two soils on microbial activities and populations was investigated for 32 weeks. The higher concentration caused reductions in carbon dioxide output and oxygen uptake in both soils. In soil I (pH 6.4, organic C 1.7%) an increase in total mineral nitrogen occurred throughout but in soil II (pH 5.6, organic C 3.7%) a reduction in both mineralization of nitrogen and nitrification was observed from week 22 onwards. In general, populations of fungi and actinomycetes were resistant to or stimulated by bentazone, especially in soil II at 100 ppm. With bacteria, including cellulolytic and spore formers, cellulolytic fungi and actinomycetes, there was some inhibition even at the low concentration, effects being more pronounced in soil II than in soil II. The herbicide at 20 ppm had very little effect on growth and morphology of four fungal species in pure culture. Residue analyses showed that bentazone degraded more rapidly in soil II than in soil I although appreciable effects occurred throughout the experiment in both soils.
- Subjects
SOILS; CARBON dioxide; OXYGEN; NITROGEN; HERBICIDES
- Publication
Weed Research, 1978, Vol 18, Issue 5, p293
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1978.tb01163.x