The goal of the presented study carried out at the Experimental Station in Jelcz – Laskowice (51^o3’ N; 17^o22’ E) in the years 2005-2007 was to estimate the effect of the tillage simplifications on the infestation dynamics, maize grain yield and rimsulfuron degradation rate. Three-year long tillage simplifications affected average weed density per unit area. Tillage simplification in maize monoculture increased the total number of weeds in comparison with the conventional tillage (about 37%) and also caused compensation of two weed species: Echinochloa crus-galli and Chenopodium album. Significant differences in maize grain yield between conventional and simplified tillage systems were recorded. About 42% maize grain yield reduction was observed as an effect of tillage simplification. There were no significant differences in the efficiency of Titus 25 WG between tillage systems. Tillage simplifications did not significantly influence rimsulfuron residues in the 0-20 cm soil layer, but they affected the rate and the range of rimsulfuron translocation into the soil profile. In the reduced tillage system, the rate of rimsulfuron translocation to deeper soil layers was considerably lower.

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