This research aimed to evaluate the retention by leaves of Brachiaria plantaginea and by soil surface submitted to early post-emergence application of spray solution, after varying the volume per square meter and nozzle position on the application boom. Three trials were carried out under laboratory conditions. Variations in sprayed solution volume were obtained by changing the movement of a device composed by an electric power unit propelled platform. Nozzle XR Teejet 8001 EVS at 21.4 kPa was utilized. The experimental treatments were set up on a randomized design with five replications. In the trial, spray solution volumes of 1,147.57; 860.68; 573.78; 459.02; 344.27; 229.51; 114.75 and 57.37 L ha-1 were applied over 600 plants m-2. In the second one, 300; 600; 900 and 1.200 plants m-2 were sprayed with 229.51 L ha-1 of solution. In the third trial, the nozzle position angles on the spraying bar of 30º, -15º, 90º, +15º and +30ºwith spray solution volume of 198.76; 221.69; 229.51; 221.69 and 198.76 L ha-1, respectively, were studied. Negative sign indicates angles on the same dislocation direction. Spray solution retention on the plants and soil were evaluated by electric conductivity. It is concluded that the retention percentage on B. plantaginea was enhanced by reducing the volume of spray solution per hectare and increased by increasing plant density. Nozzle angles on the spraying bar increased the retention of solution in relation to 90º.
Spray technology; spray solution retention; density; B. plantaginea.
