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Influence of 27-m Sprayer Boom Dynamics on Precision Chemical Application

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  031158,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13752) @2003
Authors:   Hong Y. Jeon, Alvin R. Womac, Josh Gunn
Keywords:   Application rates, Spray boom, Sprayers, Chemical treatment, Variable Rate Application

The relation between boom and sprayer vehicle accelerations, boom end height and spray deposit characteristics were determined for 255 and 588 m volume median diameter (Dv0.5) droplet spectra. Boom dynamics and spray deposit were evaluated by driving the sprayer over a test track at 12.8 km/h. The track had a 20-cm-high-bump and an opposing 20-cm-deep-dip. The 255 m (Dv0.5) droplet spectra had spray coverage ranging from 11 to 22 % with a maximum coefficient of variation (C.V.) of 55 %. The 588 m (Dv0.5) droplet spectra produced spray coverage ranging from 9 to 18 % with a maximum C.V. of 39 %. Droplet density of 255 m (Dv0.5) droplet spectrum was correlated with boom vertical accelerations with Pearson correlation coefficients from 0.51 to 0.53. A boom height range lower than 1.5 m was determined by the Tukey-Kramer test to maintain maximum spray coverage and minimize spray coverage variation of the 255 m (Dv0.5) droplet spectrum.

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