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Title:   Author  item
                                            Zhu, Hepingitem
                                            YU, Y - OHIO STATE UNIVERSITYitem
                                            OZKAN, H - OHIO STATE UNIVERSITYitem
                                            Derksen, Richarditem
                                            Krause, Charles
  Submitted to: International Crop Protection Compendium
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/20/2008
                                    Publication  Date: 9/28/2008
                                    Citation: Zhu, H., Yu, Y., Ozkan, H.E., Derksen, R.C., Krause, C.R. 2008. Evaporation and deposition coverage of single droplets on various waxy surfaces. International Crop Protection Compendium.73(4):711-718Interpretive Summary:
                                Technical Abstract: The droplet evaporation and residual coverage area on surfaces with various waxy conditions was investigated to improve the foliar spray application efficiency.  The investigation was conducted with an environmental-controlled chamber under controlled laboratory conditions.  A stereoscope and a high definition digital camera was used to record the droplet evaporation process.  Variables for the investigation were: three different target surfaces (hydrophilic slide, hydrophobic slide, and crabapple leaf), five droplet sizes (246, 343, 575, 762, and 886 μm).  The spray mixtures used to form droplets included different combinations of water, an alkyl polyoxyethylene surfactant, and two insecticides.  Adding the surfactant into spray mixtures resulted in a great decrease in droplet evaporation time and a great increase in maximal droplet coverage area while adding drift retardant into the spray mixtures resulted in a slight increase in droplet evaporation time but did not change the maximal coverage area.  The evaporation time of 343 μm droplets containing insecticides at 60% RH on the hydrophilic surface increased from 70 to 91 s after drift retardant was added into spray mixtures, and decreased from 70 to 50 s after surfactant was added.  Among the three target surfaces, the droplets had the longest evaporation time and smallest coverage area on the hydrophobic surface, while droplets had the shortest evaporation time on crabapple leaf surfaces, and largest coverage area on the hydrophilic surface.


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