The objective of this trial was to evaluate the effect of surfactants and nozzle types on spray deposition over Cynodon dactylon plants. The treatments were arranged in a 2x5 factorial design, as follows: two nozzles (XR 11002 and TX-VK 8) and five spray solution conditions (Aterbane and Silwet at 0.05% and 0.1%, and without surfactant). The spray solution was prepared using brilliant blue FDC-1 at 1,500 ppm as a tracer. The trial treatments were set up on a randomized design with 10 replications. The applications were performed with stationary spray equipment in a constant pressure so as to obtain a spray solution consumption of 150 L ha-1. Nozzle TX-VK 8 provided a higher drop deposition compared with the flat fan nozzle, regardless of solution condition. Both Aterbane and Silwet at 0.1% provided increases in drop deposition with the solution applied with the flat fan nozzle. The highest drop deposition was observed when Silwet was applied at 0.05% through the hollow cone nozzle. Drop deposition on the leaves was more reduced for both nozzles when the solution was applied without surfactant.
surfactant; drop; Cynodon dactylon; weed
