This work aimed to evaluate spray distribution by spraying hydraulic nozzles for the application of herbicides in the pre-emergence of weeds, due to the spacing in spraying boom used in areas reforested with eucalyptus. The trial was carried out at the Weed Science Laboratory from the Phytosanitary Department, UNESP - Jaboticabal Campus - SP, Brazil. It was used air induction nozzles AIUB 025, AI 110025, TTI 110015 and DB 12002, on spacing 0.8; 1.0; 1.2; and 1.5 m, between them. The spraying liquid distribution evaluation was done in patternator table. It was sprayed water plus 0.1% of non-ionic adjuvant alkylphenol . The observed values were considered to obtain deposition curves and calculate the variation coefficient. It was observed that the model AIUB 025 has minor variation coefficients and showed the best features of spraying distribution in relation to AI 110025, TTI 110015 and DB 12002 for two nozzles. Considering three nozzles, and following only the distribution criteria, the best combination was with AIUB 025 and DB 12002, this last one between two AIUBs. The third nozzle had significantly increased the consumption of spraying volume.
application technology; pacing between nozzles; overlap
