The influence of herbicides of selective action on biological activity and soil toxicity under conditions of steppe zone of Buryatia

The purpose of the study was to research the effect of se- lective herbicides on soil biological activity and phytotoxicity in the conditions of the steppe zone of Buryatia. The results of the investigation of the influence of four modern herbicides (Magnum Super, Plugger, Balerina, LastikTOP) and their tank mixtures were presented. To determine biological activity of the soil, the method of application of linen fabric (according to Mishustin E.N.) in the soil layer 0-20 cm after 30, 60, 90 days was used. The soil for the assessment of phytotoxicity was selected from a depth of 0-20 cm in 90 days after treatment. As a test object, cress-salad seeds (lat. Lepidiumsativum) were used to test the phytotoxicity of the soil, which gives the most stable and reproducible data, characterized by rapid growth, almost 100 % germination and having clear reaction to the presence of contaminant. In 30 days after treatment, the percentage of tissue weight reduction was approximately at the same level...