Revista Brasileira De Herbicidas 2011; 10(3): 266-276
Control of Euphorbia heterophylla with mesotrione and oils to different nozzles
The aim of this study was evaluate the interaction between adjuvants and spray nozzles Euphorbia heterophylla control with mesotrione. Was held application of the herbicide by three models of spray nozzles (TT 110.02, AI 110.02 and TTI 110.02) and two dosages of mineral and vegetal oil (0.5 and 3.0%). Also was verified the qualitative attributes of nozzles, using a distribution table and a droplet analyzer laser. We evaluated the visual intoxication in plants at 2, 7, 14 and 21 days after application, the dry mass of the plants at 21 days, the distribution of the drops given by the nozzles, the VDM, the percentage of volume applied with drops smaller than 200 microns, the coefficient of space variation (CV) between nozzles and the coefficient of uniformity (SPAN). Higher doses of oil were more damaging to dairy plants, with all spray nozzles tested. The vegetable oil performed better in relation to the mineral. The adjuvants reduced the DMV of all nozzles, increasing the percentage of droplets smaller than 200 microns and reduced SPAN values for TT 110.02 nozzle. The adjuvants addition enables greater uniformity even with the increased spacing of nozzles (TT 110.02 and TTI 110.02) on the spray boom.
103