Efeito de pontas e pressões de pulverização na deriva de glyphosate + 2,4-D em condições de campo

Abstract

The aim of the work was to evaluate the effect of nozzles and pressures on the spray drift from glyphosate + 2,4-D. The nozzles designs and the respective studied pressures were: XR 11002 (150 and 300 kPa), DG 11002 (300 kPa), TT 11002 (300 kPa), AI 11002 (300 kPa) and TXVS-10 (400 kPa). Nylon strings outside the application area (1, 5, 10, 20, 50, 100 and 200 m distance) with four replications and six foam cylinders placed on the boom of the sprayer were used to collect the spray drift. Salt tracers were added in the spray solutions to quantify the deposits of each treatment by spectrophotometer. Herbicides were less and more susceptible to drift with the flat fan nozzle with pre-orifice and air induction (AI) and the hollow cone nozzle (TX), respectively. The nozzle selection and the reduction on the spray pressures may be used to decrease drift.