Evaluation the sprying syrup deposition in function of the beak type and the flow, in soybean - DOI: 10.4025/actasciagron.v30i2.1789

Abstract

The experiment was carried out in Cascavel, Paraná State, using the soybean cultivar CD 202, with the objective of evaluating the amount of spraying suspension deposited on soybean leaves. Samples were collected containing 15 leaves per plot in five plants in different extracts - one leaf of the lower extract, one of the medium and one of the upper extract - with the objective of evaluating the amount of suspension deposited in function of flow and nozzle type. The treatments were constituted of four spraying nozzles (simple fan, double fan, double fan with air injection and empty cone) and three suspension volumes (100, 200 and 300 L ha^-1). The suspension volume that presented the highest depositions in the different extracts of the soybean plants was 300 L ha^-1; the spraying nozzle that presented the highest depositions, in the upper plant extract was the double plane jet; for the medium and lower extracts, the jet empty cone nozzle. The depositions in middle and lower thirds of the soybean plants were significantly lower to those obtained in the upper third, regardless of the nozzle and flow used; for higher depositions in the upper third of soybean plants, the best combination is to use double plane jet nozzles, with suspension volumes of 300 L ha^-1; for higher depositions in the medium and lower third of soybean plants, the best combination is to use conical jet nozzles, with suspension volumes of 200 or 300 L ha^-1