Three adjuvants were prepd. and used to enhance the herbicide activity of 2-chloro-N-(2,6-dimethylphenyl)-N-(pyrazol-1-ylmethyl)acetamide (metazachlor) under lab. and field conditions in winter oilseed rape culture. The addn. of the adjuvants resulted in an increase of herbicide uptake by germination plants and herbicide leaching redn. into soil profile as well as an increase in seed yield.