Print version ISSN 0100-8358
SOUZA, L.A; CUNHA, J.P.A.R and PAVANIN, L.A. Efficacy and loss of 2,4-d amine herbicide applied at different spray volumes and nozzles. Planta daninha [online]. 2011, vol.29, n.spe, pp. 1149-1156. ISSN 0100-8358. http://dx.doi.org/10.1590/S0100-83582011000500023.
This study evaluated the efficacy of the herbicide 2,4-D amine in weed control, and spraying losses using different nozzles and spray volumes. The experiment was arranged in a randomized block design with six treatments and four replications, totaling 24 plots, in a 3x2 factorial model: three spray nozzles (drift guard twin flat fan, turbo flat fan and air induction turbo flat fan) and two spray volumes (80 L ha-1 and 130 L ha-1). The active ingredient used was 2,4-D amine (806 g ha-1 a.i.). Spray deposition on the weeds, losses to the soil and exo-drift losses were evaluated, as well as weed control in the area. Evaluations of spray deposition on the weeds, drift and losses to the soil were carried out by herbicide quantification using high-performance liquid chromatography (HPLC). According to the results obtained, it was concluded that the spray volume of 80 L ha-1 and coarse droplets can be used for weed desiccation with the herbicide 2,4-D amine, without compromising target coverage; air induction turbo flat fan nozzles promoted greater herbicide loss to the soil; the different nozzles used, with medium, coarse, and very coarse droplets, as well as the spray volumes 80 L ha-1 and 130 L ha-1, did not affect weed control. Drift was not detected with the methodology applied.
Keywords : spray technology; weed; deposition; drift.