Submitted to: American Society of Agricultural Engineers Meetings Papers
Publication Type: Proceedings
Publication Acceptance Date: August 12, 1997
Publication Date: N/A
Technical Abstract: Spray penetration and off-target spray drift from a conventional, air-assist, axial fan sprayer and a high-clearance, boom-type sprayer were investigated in Gleditsia triacanthos or Tsuga canadensis located in two different production nurseries. Aqueous tracer solutions of either Ca(NO3)2 foliar fertilizer or Cu(OH)2 fungicide were used in the experiments. Spray distribution and drift were assessed via residues collected on foliage, electron microscope stubs, vertical and ground-level profile tapes, and high-volume air samplers. Electron beam analysis (EBA) was used to assay residues on stubs, leaves and needles placed and/or collected at several locations and heights in the canopy. Profile-tape samples were evaluated with a laboratory spray deposit analyzer using a conductivity detector. Spray coverage was incomplete throughout either canopy as assessed by either method. Experimental results indicated that ground-level spray deposits and airborne drift varied with the spray method used.