Potencial de deriva da mistura de 2,4-D com glyphosate

Abstract

The application of the mixture of glyphosate with 2,4-d took on great importance with high adoption of no-tillage system in the early 90s, and with the constant reports of weed biotypes resistant to glyphosate. However, studies on the drift of this mixture are still scarce. The aim of this study was to evaluate the potential drift of these herbicides, with or without the adjuvant, applied in wind tunnel. The experimental design was completely randomized considered, arranged in a factorial design 5 x 3, with four replications, and five tails and three collection distances (5, 10 and 15 meters). The spray tested were: glyphosate, 2,4-D, 2,4-D+glyphosate, glyphosate+2,4-D+adjuvant, and a control in which water was applied. The collection points were installed at 5, 10 and 15 meters and in this points each 20 cm of height in relation of tunnel ground until 1,0 m of height. The application of the products took place in a wind tunnel with 20 m length and cross-sectional 4 m 2 with speed wind of 2.0 m s -1 ,. The mean values obtained in the samples were subjected to analysis of variance, and their means were compared by Tukey test at 5% probability. It was observed that herbicide application associated produces more drift than when applied alone mainly to 5 and 10 meters of distance to sprayer boom. The drift of each herbicide applied alone did not differ. When added to the adjuvant mixture glyphosate plus 2,4-D, there was a 23% reduction in drift at 5 m and 6 m to 10%.