Spray deposition on soybean varietes at R1 grow stage

摘要

> size="2" face="Verdana, Arial, Helvetica, sans-serif">Whit the objective of quantifying the deposits of spraying in two soybean cultivars ('208 CD' and 'CD 216') at R1 grown stage through different nozzles and volumes of spraying, two experiments were carried out at the experimental area of Agricultural College UNESP- Botucatu/SP. The treatments were: flat-fan nozzle (AI 110015 at 150L ha-1, AI 11002 at 200 and 250L ha-1); twin flat-fan (TJ 60 11002 at 150, 200 and 250L ha-1); conical (TX-6 at 150, TX-8 at 200 and TX-10 at 250L ha-1) and twin flat-fan and low drift (DGTJ 11002 at 200L ha-1). The experimental design was a randomized completely block, with four replicates. For the evaluation of the deposition Blue courante Shining FDC- 1 was used in the spraying (500mg L-1). In each replication, 25 plants in had been collected divided in basal and apical section. Deposits content was determinated by absorbance in the wave length of 630nm, then transformed into deposits per gram of dry matter and adjusted to the regression curves, through the model of Gompertz. The biggest deposits were evaluated with AI 11002 at 250L ha-1 and TJ 60 11002 at 250L ha-1, in the cultivar 'CD 208' and 'CD 216', respectively. Treatments whit the largest deposits showed the minor distribution uniformity.