Revista Brasileira De Herbicidas 2001; 2(3): 93-98
Efficacy and selectivity of trifloxysulfuron-sodium/ametryne in the control of weeds in sugar cane fields
DOI: 10.7824/rbh.v2i3.356
A trial was carried out in a sugar cane field in Santa Helena County, Goias State, Brazil, during the 1999/2000 growing season. The objectives were to evaluate the agronomic efficiency of a misture of trifloxysulfuron-sodium/arnetryne in the control of weeds and to evaluate the selectivity for sugar cane. The experimental design was a completely randomized block with four replications and eight treatments. The treatments were as follows: cleaned and noncleaned plots, trifloxysulfuronsodiurnJametryne (32/1280, 37/1463 and 42/1646 g/ha), trifluxysulfuron-sodium+ametryne (tank mixture), at 37+ 1500 g/ ha, hexazinone/diuron (330/1170 g/ha) and trifluxysulfuron-sodiurn (22 g/ha). The herbicides were applied at postemergence, with the broadleaf weeds at the 4 to 61eaf stage and the grasses at 2 to 3 stem stage. Acanthospermum hispidum, Alternanthera tenella, Chamaesyce hirta and Digitaria horizontalis were effectively controlled with trifloxysulfuron-sodium/ametryne at all studied rates, trifloxyxulfuron-sodium+ametryne (tank mixture) at 37+ 1500 g/ha, and hexazinone/diuron (33011170 g/ ha). Trifloxysulfuron-sodium (22 g/ha) showed very low control of Digitaria horizontalis as well as an efficient control of broadleaf weeds. All herbicide doses were selective for sugar cane cv. RB 84-5257. There were no statistical differences for sugar cane plant height, new stem formation and yield, although the control, where weeds were not cut, presented a 5,4% reduction in yield compared to the control where it was not ceaned.
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