IMPACTOS DA VELOCIDADE DE APLICAÇÃO NA DISTRIBUIÇÃO DE GOTAS EM DIFERENTES SISTEMAS DE PULVERIZAÇÃO NA CULTURA DA SOJA (Glycine max L.)

Abstract

In view of the current scenario in the cultivation of soybeans, the loss of efficiency of the sprayings is worrying due to the little application technique used. The objective of the work was to evaluate applications with different displacement speeds, using two models of sprayers M 4730 and M 4040 (ExactApply ™ system) in soybean (Glycine max L.). A randomized block design (DBC) was adopted, with a split plot scheme. It evaluated four travel speeds (10, 15, 20 and 25 km / h). The sprayings were carried out with two spray models, the M 4730 and the M 4040 on the soybean cultivar BMX Bonus in reproductive stage 3 (R3), with cone-type tips (Teejet TXR80049VK (50)) on water-sensitive papers, with a volume of syrup of 60 liters per hectare (L / ha). Images were captured in two ways, with and without light control, on water-sensitive papers. To perform the analysis of variance, normality and homogeneity (Shapiro and Barlett) were tested, and Tukey and LSD mean tests were applied at 5% and 10% probability. For both models of sprayers, the speed of 15 Km / h showed a higher number of drops, the model M 4730 had a higher number of drops and the model 4040 had a greater uniformity of drops at the different tested speeds. Thus, it is necessary to use the application technology to obtain effective control and that the product has a permanent effect on the target.