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Leaf Deposition with Fixed Sprinklers, Low Drift and Conventional Nozzles in Apple Orchard

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

Citation:  2011 Louisville, Kentucky, August 7-10, 2011  1110798.(doi:10.13031/2013.37314)
Authors:   Bernard Panneton, Marlène Piché, Vincent Phillion, Gérald Chouinard
Keywords:   spray, deposition, orchard, sprinklers, low drift nozzles

Field experiments were conducted to measure deposition of spray on leaves in apple orchards for the application systems. The orchard was planted with dwarf trees. A permanent sprinkler system was installed for pesticide applications. Sprinklers were installed above the canopy centered on the tree rows, one sprinkler for two trees and following an alternating pattern on adjacent tree rows. Also a conventional radial sprayer with reduced airflow and fitted with conventional or low-drift nozzles was used. The spray liquid was water with food dyes. A three dye system was used with one color per treatment. Small self-adhesive vinyl disks were placed on the leaves at 5 different locations on the top and bottom side of the leaves and spectroscopic analysis was performed to obtain leaf deposit. The ratio of bottom to top leaf deposit was closer to 1 with the low drift nozzles, higher than 1 with the conventional nozzles and close to 0 with the sprinklers. Leaf coverage with the low drift nozzles was not statistically different from the deposit with conventional nozzles in all tree locations both on the top and bottom surfaces of the leaves except in the lower part of the trees close to the trunk where low drift nozzles produced higher deposits. Overall, the low drift nozzles deposited more spray to the trees and produced less variability among the various positions in the trees.

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