HERBICIDES EFFICIENCY AND SELECTIVITY ON WEED CONTROL IN THE SOYBEAN CROP

In order to evaluate the efficiency and selectivity of Boral (sulfentrazone), Scepter (imazaquin) and Sencor (metribuzin) on weed control in the soybean crop, a trial was carried out at Escola de Agronomia / Universidade Federal de Goiás. Six treatments were tested: 1- Boral 500 SC(1.2 l/ha); 2- Sencor 480 SC (1.0 l/ha); 3- Sencor 480 SC +Scepter 150 CE (0.6 + 0.8 1/ha); 4- Sencor 480 SC + Boral 500 SC (0.75 + 0.70 1/ha); 5- Not weeded control; 6- Weeded control. These treatments were planted as randomized blocks design with four replications. The soybean cultivar was MTBR-49 (Pioneira), sowing in 50 cm spacing and 20 plants/m density. There were not differences between the treatments in the first and second evaluation of Sida rhombifolia L., Spermacoce latifolia Aubl. and Ipomoea purpurea Lam. occurrence. There were differences between treatments for Acanthospermum australe (Loefl.) O. Kuntze at first evaluation (27 days after herbicides application and for Brachiaria decumbens Stapt.) and second evaluation (41 days after herbicides application). During the evaluations it was not found fitotoxicity. KEY-WORDS: Sulfentrazone; imazaquin; metribuzin; soybean.