Nowe Rozwi zania w Stosowaniu Herbicydów - Wp yw na Zanieczyszczenie rodowiska Glebowego

The aim of the study was to evaluate the influence of a herbicide application system on herbicide residues in soil. Preparates containing fenmedifam, desmedifam, etofumesat, metamitron, triflusulfuron and oil adjuvant were applied in the study. Chemical weed control in sugar beet was carried out using herbicides applied in three different systems: double application - preemergence (on bare soil) and postemergence application (weeds in the phase of 2-4 leaves) - system A; preemergence and split postemergence application with adjuvant (triple application) - system B; and quadruple application in 7 to 10 day intervals beginning with first weed emergence (micro-rates of herbicides) - system C. Samples of soil were collected on the harvest day. Herbicide residues were analyzed using HPLC with UV-detection. The sum of all detected residues in system A reached 0.0386-0.0596 mg·kg-1. The application of herbicides in systems B and C resulted in a significant decrease of residues on average 34% (system B) and 62% (system C) in comparison to results obtained for system A.