Característica da deposi??o e distribui??o da calda de pulveriza??o na cultura da soja em estádio fenológico V6

摘要

This work aimed to evaluate the performance of spray deposition produced by different spray nozzles and work pressures in soybean crop on V6 phenological stage. Eight treatments and fifty repetitions were studied in completely randomized delineation, in factorial scheme 4x2, represented by four models of spray nozzles of MagnoTM manufacturer and by two work pressures (207 and 414 kPa), constituting the treatments AD 11002 (152 L ha-1 and 208Lha-1), AD/D 11002 (152 L ha-1 and 208 L ha-1), AD-IA/D 11002 (152 L ha-1 and 208 L ha-1), MAG 2 and MAG 3 (157 L ha-1 and 212 L ha-1). Bright Blue FD&C-1 (0.3% p/v) and Tartrazine Yellow FD&C-5 (0.6% p/v) were used as tracers to monitoring the spray deposition. The unitary deposits of solutions over the upper and lower trifoliates from the soybean plants were quantified by spectrophotometer. The greatest amounts of spray deposition, at upper and lower positions of soybean crop, were obtained with MAG 2 and AD/D 11002 nozzles, with 414 kPa pressure. The pressure increase from 207 to 414 kPa using AD11002, AD/D 11002 and AD-IA/D 11002 nozzles raised the deposition over upper and lower trifoliates, in opposition to the use of MAG 3 nozzle in relation to MAG 2, in 414 kPa.