Different mixtures of metribuzin with trifluralin, prendimetalin, dinitramine or alachlor were compared in order to evaluate weed control efficiency on soybean crop. Tank mixtures of 2,00 Kg/ha of alachlor and 0.35 Kg/ha of metribuzin, or 3,00 Kg/ha of alachlor and 0,50 Kg/ha of metribuzin, and 1,00 Kg/ha of trifluralin and 0,50 Kg/ha of metribuzin were the most efficient in controlling grasses and dicotyledons. Acanthospermum au strale was the most difficult weed to be controled. Only alachlor at 2,00 Kg/ha plus linuron at 0,75 Kg/ha gave satisfactory results. The mixtures of pendimethalin at 1,30 K/ha or dinitramine at 0,50 Kg/ha plus metribuzin at 0,50 Kg/ha were fitotoxic at the initial growth stage of soybeans, but did not affect stand or yield. The other mixtures did not show any fitotoxicity and did not affect stand or yield either.
Weed control; soybeans; mixtures of herbicides