Viability of applying herbicides in «vinhaça» to control weeds in ratoon sugarcane

[摘要] In this study, herbicides were applied in «vinhaça» (liquid residue of alcohol distillation) and at the usual way. Herbicides used were oryzalin, diuron, 2,4 -D, ametryn and tebuthiuron. The application in «vinhaça> was done with a tank-car of 7,000 liters capacity. The tank was in connection with a spraying boom. Special design of the nozzles worked as jet pump, in order to have a good distribution of the solution onto the soil sur face. A 36 HP pump controlled the amount of spray, which was of 25,000 liters per hectare. To spray as usual, a John Bean sprayer pump was used, having 16 nozzles teejet 110.04, working at pressure of 1,4 kg/cm2 . To compare the treatments, a split plot design, with four replications was used.All the herbicides, except diuron showed good performance in weed control, when applied in »vinhaça». Diuron behaviour in «vinhaça» was very poor. Ametryn and 2,4 - D showed better characteristics as weed killers when applied in »vinhaça». No differences in the performance of tebuthiuron and oryzalin , in weed control, were observed when applied with or without «vinhaça».

[学科分类] 农业科学（综合）

[关键词] Herbicides «vinhaça»;sugarcane.