Adsorption and degradation behavior of six herbicides in different agricultural soils

This study focuses on the assessment of herbicide adsorption and degradation in three soils (Haplic Chernozem, Haplic Fluvisol, Arenic Regozem) from different agricultural regions Czech Republic where sunflower is cultivated. Soil samples were used laboratory batch experiments for six herbicides commonly crops. The findings are to examine effect soil properties degradation, as well determine possible relationship between two processes. (Kf) sorption coefficient ranged 1.07 135.37 cm3/nμg1−1/ng−1, increased following order: dimethenamid-p < pethoxamid S-metolachlor flurochloridone aclonifen pendimethalin. Adsorption all was positively correlated with organic matter content (p 0.001), cation exchange capacity 0.001). pH negatively compounds Degradation rates 0. 012 048 day−1, which corresponding half-lives (DT50) 14 57 days, respectively. highest half-life values found Fluvisol (a loam higher lower pH). Results showed that both mainly controlled by matter. A negative rate degradation. It can be concluded Freundlich a good predictor studied herbicides.