Abstract
Field experiments were conducted to investigate the effect of sprayer type, application volume rate, and airflowrate on spray deposition along depth of the citrus canopy. The trees were sprayed from one side using a tower sprayer withcrossflow fans and rotary atomizers (Curtec) at three spray volume rates and a tower sprayer with an axialflow fan andhydraulic nozzles (Titan) at two spray volume rates and two airflow rates. Spray deposition was determined with fluorometryusing cotton ribbons as targets within the entire canopy depth at two heights.<br><br>For both sprayers, deposition decreased with canopy depth, and spray penetration was improved as the volume rateincreased. The effect of volume rate became significant after about 1 m and 2 m depths for the Curtec and Titan sprayers,respectively. At the highvolume rate, mean depositions of the two sprayers were not significantly different. In general,operating the Titan sprayer at 1600 rpm (lower airflow) gave mean deposition comparable to that at 2225 (rated) rpm (higherairflow). The effect of airflow on spray penetration was significant beyond about 2 m depth.
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