The growing use of pesticides in agriculture will consume more than six million cubic meters of water annually in Brazil, on sugarcane crop alone. The minor volumes of water can give an increase in autonomy and capacity of sprayer, and reduces the chance of loss by runoff. This work has the purpose to compare different rates of the glyphosate herbicide application, concerning efficiency of control and volume deposition on weeds, at operations of “repass” on sugarcane crop. Eight treatments with four replications were studied in randomized blocks. Application rates evaluated were: 8.8, 73, 96.7, 190, 260, 380 and 467 L ha-1, using a pressurized knapsack sprayer and another with hand operation and a rotative micronizer type CDA. Efficiency on weed control was evaluated considering obtained application effects on each treatment. Qualitative evaluation, comparing obtained deposition on each treatment, was done spraying on weeds with a solution of water plus sodium chloride, using the same equipament and conditions. The results showed the possibility to use lower flow rate of application without problems over the quality.
application technology; pesticides; spraying; Saccharum spp
