Spray Capture Efficiencies of Ribbon and String Targets Used in Orchard Applications
2006
The main objective of the study was to establish the relationship between spray deposition
on ribbon and string samplers in filed applications. The experiment involved five commonly used
citrus air-carrier sprayers, which included both conventional and tower configurations, equipped with
axial- or cross-flow fans and hydraulic nozzles or rotary atomizers. A sampling structure, consisting
of vertical and horizontal lines of polyester string and cotton ribbon, was constructed in a citrus
grove. Spray mixtures, containing a fluorescent tracer, were applied at different volume rates and
ground speeds (nine treatments) on a 30-m course between two tree rows. Shortly after spraying
each replication, the lines were collected in pieces. In the laboratory, the amount of deposit was
determined by fluorometry. Weather data recorded during the applications were used as covariables
in the analysis of variance. Each treatment was replicated 3-5 times.
The results showed a significant difference between capture efficiencies of the two target types. In all
sample locations, the amount of spray deposit on the string was higher than that captured on cotton
ribbon. Overall, the mean and standard deviation of the string/ribbon deposit ratios were 2.3±0.7.
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