Abstract
The volume of spray deposit throughout an oak canopy was measured at a single-leaf resolution. Profiles of deposit (international units per cm2) are compared for upper and lower-canopy levels and positions within these levels. Droplet sizes and densities are shown for upper- and lower-canopy levels. Artificial targets were used to measure the deposit at ground level, the deposit on a horizontal profile at midcrown, and the deposit over a vertical profile from the canopy top to the ground. No significant differences were found between the levels or positionsin the canopy ( P > 0.05). However, highly significant variation was shown among sample trees ( P < 0.001). The distribution of dose among individual leaves was shown to be highly variable with approximately a lognormal distribution.
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