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Summary A loamy sand soil was dried, stored up to four months and remoistened before the herbicides ‘Kerb 50 W’ (Propyzamide) and ‘Flussig Herbogil’ (Dinoterb) were applied. The influence of drying on microbial populations, nitrification and cellulose decomposition as well as on microbial response to the herbicides was investigated. In fresh soil especially ‘Flussig Herbogil’ caused dose-dependent changes in microbial populations and reduced nitrification. The cellulose decomposition was inhibited or stimulated depending in the period of decomposition. Dry storage changed microbial populations and their response to the herbicides, but had less pronounced effects on nitrification. It also increased the duration of inhibited cellulose decomposition. Therefore, these results even require precise description of the conditions under which the soils were stored before they were used in ecotoxicological laboratory trials. |
