This study aimed to evaluate the technical characteristics of LA-1JC and SR-1 skim nozzles, at different pressures and spray boom heights. Each nozzle distribution profile, volumetric distribution quotient in one spray boom, rate, volumetric median diameter (VMD), numeric median diameter( NMD),coefficient of homogeneity, nozzle symmetry index and left, right and total opening angles were evaluated at 100, 200, and 300 kPa. Nozzles showed continuous profile at 100 kPa for SR-1 nozzle and at all pressures for LA-1JC nozzle. The SR-1 nozzle showed discontinuous distribution profile at pressures 200 and 300 kPa. The best profile for both nozzles was verified when nozzles were smaller, and pressures and boom height were higher. Increased opening angle and rate were observed with increased pressure in both nozzles. The drop spectrum obtained is adequate to systemic herbicide application in post-emergence and to herbicide applied in preemergence. LA-1JC at 100 kPa and SR-1 at all pressures should not be used in nozzle overlapping at 100 kPa.
skim nozzle; spray drift; drops; application technology
