
The examination is performed in the proving grounds of the Agricultural Institute – Shumen, for the period from 2013 to 2014. The influence of some selective soil herbicides of sugar beet on the rhisosphere microflora was established in the proving grounds. Suppression of the soil bacteria by the herbicide S metalochlor in dose (2000 ml/ha) was observed. A total suppression of the microflora in dose 3000 ml/ha was observed as well. The herbicide propisochlor (2000 ml/ha) influences the quantity of the rhisosphere microflora.