Studying and developing new techniques and equipments to apply phytosanitary products is of fundamental importance to place the product with higher precision on the chosen target. The objective of this work was to evaluate the effects of the application volume and the degree of inclination of centrifugal energy nozzles in relation to the spray boom. The experiment was carried out during the crop year of 2012/13 in the Sao Paulo State University experimental farm using the BRS Valiosa RR soybean cultivar. The experimental units were distributed in the field according to a completely random design in a 2 x 4 + 1 factorial scheme. The factor levels resulted from the combination of application volume (35 and 50 L ha-1) and degree of inclination (60, 40, and 20� pointing to the region behind the spray boom and 20� pointing to the area in front of the sprayer) of the centrifugal energy nozzle plus an additional treatment in which a hydraulic energy nozzle model TT11002 delivered a spray volume of 150 L ha-1. To evaluate the deposits of the sprayed product a manganese sulfate metallic marker was added to the product. Immediately following the product application, soybean leafs were separately collected from the upper and down parts of the plant in order to measure quantity of the applied salt. Changes in the degree of inclination with which the centrifugal nozzle is positioned in relation to the spray boom favors the pulverization deposit although the results are dependent on the application volume. These alterations are insufficient to cause significant differences in mean deposits in comparison with those attained when applications were made with the hydraulic energy nozzle. The largest deposits resulted when the hydraulic energy nozzle delivered a volume of 150 L ha-1.Keywords: smallerspray volume, rotating nozzle, Glycine max (L.), application technology

Spraying deposit in soybean plants as influenced by application volume and the degree of inclination of centrifugal energy nozzles

248th National Meeting (2014)

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