Influence of herbicides on the soil toxicity and microflora in sugar beet sowings
2003
Dubova, L. (Latvia Univ. of Agriculture, Jelgava (Latvia). Dept. of Plant Biology and Protection)
The aim of the study was to estimate the influence of herbicides on soil toxicity and on the number of some microorganism groups (total number of microorganisms, fungi, first and second step nitrificators and denitrificatiors). Results of experiments from two years with different meteorological conditions were compared. The following Toxkit microbiotests were applied for assessment of soil toxicity: Protoxkit F**TM, Rotoxkit F**TM, Thanmotoxkit F**TM, and Ostracodtoxkit F. In contrast to chemical analysis, which mainly focuses on the quantitative and qualitative determination of defined contaminants in environmental samples, the biological test system detects the combined effects of different pollutants. Weather conditions can essentially change toxicity, mobility and bioavailability of toxicants in the soil. The obtained results presented various sensitivity of bioindicators and levels of soil toxicity. It was concluded that soil toxicity and number of microorganisms depend on weather conditons. Soil toxicity remained longer, if soil moisture was not sufficient. Whereas, if soil moisture was sufficient and favourable to microbiological processes, soil toxicity decreased in a some months time.
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