Deposição da pulverização com assistência de ar em cultura de soja (Glycine max (L.) Merrill).

Abstract

The aim of this work was to evaluate the effect of different application rates and air assistance on the deposition, coverage and penetration in the soybean crop (Glycine max), for better control level of Asian soybean rust (Phakopsora pachyrhizi). The experiment was carried out in Tres Barras School-Farm of UNIDERP, Campo Grande-MS, using a completely randomized experiment, in factorial outline, with 15 repetitions. The Potassium chloride was used as a tracer for deposit evaluation. The applications was used boom sprayer, with 11002 flat fan nozzles. The treatments consisted of presence or absence of attendance of air, combined with the volumes of application of 151,9 or 96,6 L/ha, obtained, respectively, with the speed of the machine to 6,4 and 10,1 km/h. After the applications, 15 leaflets of the top and 15 of the bottom parts of different plants under spray boom were collected and washed in 10 mL of distillated water. The resulting samples were analyzed by spectrophotometry equipment for quantification of the potassium and measure the area of each leaflets and a relationship of the solution volume captured by square centimeter (L cm2) of leaf was founded. The results obtained showed that air assisted, mainly when it is used larger syrup volumes, it has positive interference in the deposition and penetration of the syrup in soybean plants in R6, demonstrating to be interesting tool in the aid the disease control.