SPRAYER PUMP AND NOZZLE CAPACITY AFFECT VOLUME RATE ERRORS IN CITRUS APPLICATIONS

SALYANI, MASOUD

Abstract


The objective of the research was to determine the effects of pump type and nozzle capacity on nozzle pressure and flow rate when some of the nozzles are closed intermittently in citrus applications. The experiment involved two airblast sprayers using a positive displacement (diaphragm) pump or a non-positive displacement (centrifugal) pump. Both were operated with six nozzle selections to obtain low, medium and high volume rates. Nozzle pressure and flow rate were measured for the one- and two-sided operations. The difference in the pressure or flow rate was considered as the application error. For all nozzle selections, closing the nozzles on one side of the sprayer increased the operating pressure and the flow rate on the other side. The sprayer with a diaphragm pump was much more sensitive to the flow restriction than the one with a centrifugal pump. The volume rate errors at 470, 2350, and 4700 liter/ ha (50, 250, and 500 gal/acre) nominal rates were 1.0, 3.5, and 3.5% (centrifugal) and 6.0, 7.5, and 47.0% (diaphragm), respectively.

Keywords


calibration; nozzle pressure; application rate; airblast

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283