EN
Field experiments were conducted to evaluate efficacy of extremely reduced herbicide rates (micro-rates) applied with an adjuvant for weed control in sugar beets grown in three tillage systems: 1) conventional plowing, 2) reduced with white mustard mulch incorporated with soil and 3) no-till with direct planting in white mustard mulch. The micro-rates herbicide mixtures of phenmedipham + desmedipham + ethofumesate at 30 + 30 + 30 g active substance (a.s.)/ha, triflusulfuron at 4.5 g a.s./ha, clopyralid at 33 g a.s./ha and lenacil at 160 g a.s./ha plus methylated seed oil adjuvant at 1.5 l/ha provided similar weed control as the standard-rate herbicide treatment (phenmedipham + desmedipham + ethofumesate at 90 + 90 + 90 g a.s./ha and triflusulfuron at 15 g a.s./ha) applied without adjuvant. The herbicide used at micro-rates were less phytotoxic to sugar beet plants and increased sugar beet root yield similarly as the standard-rate herbicide treatment, regardless of the soil cultivation system.