Consequências da deriva de clomazone e sulfentrazone em clones de E. grandis x E. urophylla

摘要

This research aimed to develop accurate information about the effects of two simulated herbicide drift (clomazone and sulfentrazone) on the growth of Votorantim Celulose e Papel Eucalyptus grandis x E. urohylla comercial clones (VCP1 and VCP2). This research imposed doses to clomazone ranging between 0 and 2000 mL ha-1 and 0 to 1500 mL ha-1 to sulfentrazone. One cutting of each clone was planted in 5.0 liter plastic pots filled with sandy soil. 80 days after the planting, the herbicide applications were carried out. The treatments were applied to plots with completely randomized blocks with a 2x8 factorial design and replicated three times. The clomazone effects resulted in yellowish, pinkish young leaves and, in some cases, a whitening effect between leaf veins and strongly green and thicker older leaves. The growth parameters were reduced between 13 and 57% and the critical doses of clomazone were from 800 to 1200 ml ha-1, for the clones VCP1 and VCP2, respectively. For sulfentrazone, the drift symptoms included speckling and spotting of younger and older leaves, and purple rings around the spots. High deformation of younger leaves, regular deformation of older leaves, and apical dominance also occurred. The growth parameters indicated a reduction between 9 and 66%. The critical doses to sulfentrazone were 75 - 1200 ml ha-1, for the clones VCP1 and VCP2, respectively. We may conclude from this research that clomazone and sulfentrazone drift could affect the development of the clones evaluated.