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Characterization of spray deposition and drift from a low drift nozzle for aerial application at different application altitudes

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International Journal of Agricultural and Biological Engineering 2011年第4期4卷 28-33页

作者： Yanbo Huang Steven J.Thomson US Department of Agriculture Agricultural Research ServiceCrop Production Systems Research UnitStonevilleMS 38776USA

A complex interaction of controllable and uncontrollable factors is involved in aerial application of crop production and protection *** it is difficult to completely characterize spray deposition and drift,these important factors can be estimated with appropriate sampling protocol and *** height is an important variable influencing off-target spray drift,but this variable has not been easily measured or logged.A custom-configured aircraft-mounted laser with logging capabilities makes this *** study was designed to investigate droplet size and deposition characteristics of a low drift CP flat-fan nozzle at application altitudes 3.7 m,4.9 m,and 6.1 *** the study,CP flat-fan nozzles were set to a downward angle of 30 degrees applying a mixture of water,Syl-Tac®adjuvant,and Rubidium Chloride(RbCl)tracer at a 28.5 L/ha application *** droplets were collected using water sensitive paper(WSP)cards placed in the spray *** sheets were also placed in the swath and downwind for drift *** analysis indicated that median droplet diameter as determined by WSP in the spray swath was not significantly influenced by spray application ***,statistical analysis also indicated that concentration of RbCl tracer from Mylar samplers in the spray swath was not significantly influenced by application *** height had a significant effect on spray deposition from drift samplers,along with wind direction and relative *** results for drift samplers may have been influenced by shifts in wind direction that altered the relationship between orientation of samplers and wind.

关键词： deposition spray nozzle aerial application droplet spectra spray drift

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Drift potential of UAV with adjuvants in aerial applications

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 54-58页

作者： Xiaonan Wang Xiongkui He Jianli Song Zhichong Wang Changling Wang Shilin Wang Ruochen Wu Yanhua Meng College of Science China Agricultural UniversityBeijing 100193China Quanfeng Aviation Plant Protection Technology Co. Ltd.Anyang 455001China

The reduction of pesticide aerial spraying drift is still one of the major challenges in modern *** aim of this study was to evaluate the drift potential of different types of unmanned aerial vehicle(UAV)and adjuvant products for reducing spray drift in aerial *** types of UAV(3WQF120-12 and 3CD-15 fuel oil powered single-rotor UAV and HY-B-15L battery powered single-rotor UAV)were selected in this study with regular application parameters to compare each spray drift,and 3WQF120-12 fuel oil powered UAV was selected to quantify spray drift of 6 adjuvants dissolved in water under field *** were marked with brillant sulfoflavin dye(BSF)at 0.1%.Petri dishes and rotary impactors were used to collect airborne and sediment drift,*** deposits were evaluated by spectrophotometry in order to quantify *** results showed that when the flight height was 1.5-2.0 m above the crop at the flight speed of 4-5 m/s and the average wind speed of 1.63-1.73 m/s,3WQF120-12 fuel oil powered UAV had lower drift potential than the other two types;DV0.5 and percentage of droplets with diameter≤75μm had very significant effects on spray drift percentage(p=0.01);the risk of drift in agricultural spraying could be significantly decreased not only by reducing the percentage of fine droplets but also by changing droplet *** to water,Silwet DRS-60,ASFA+B,T1602,Break-thru Vibrant,QF-LY and Tmax could reduce by 65%,62%,59%,46%,42%,and 19%spray drift,*** water without adjuvants were sprayed,90%of drift droplets were located within a range of 10.1 m of the target area while with 0.8%Silwet DRS-60 adjuvant in water,the distance was shortened to 6.4 m.

关键词： spray drift UAV adjuvant aerial application drift potential evaluation droplet size

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Portable device to assess dynamic accuracy of global positioning system(GPS)receivers used in agricultural aircraft

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International Journal of Agricultural and Biological Engineering 2014年第2期7卷 68-74页

作者： Steven J.Thomson Yanbo Huang Lowrey A.Smith United States Department of Agriculture(USDA) Agricultural Research Service(ARS)Crop Production Systems Research UnitStonevilleMS 38776USA

A device was designed to test the dynamic accuracy of Global Positioning System(GPS)receivers used in agricultural aircraft and other aerial *** system works by directing a sun-reflected light beam from the ground to the aircraft using mirrors.A photo detector points downward from the aircraft to detect the light beam,and photo detection circuitry triggers an event in the guidance system data file at the aircraft’s location corresponding to the precisely georeferenced position on the *** details are presented on the mirror-based light reflection system and photo-electronic circuitry designed to trigger an event in the guidance system’s log *** example application evaluated the horizontal accuracy of a stand-alone GPS receiver by matching dynamic data with data from the aircraft’s guidance *** indicated a 2.16 s lead in position registered by the stand-alone receiver over that registered by the aircraft’s guidance system GPS receiver,which had been previously evaluated to be within 0.13 s of Real-Time Kinematic(RTK)-referenced time and position.

关键词： GPS receiver accuracy agricultural aircraft aerial application remote sensing georeferencing UAV

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Characterizing downwind drift deposition of aerially applied glyphosate using RbCl as tracer

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 31-36页

作者： Yanbo Huang Claudiane M.Ouellet-Plamondon Steven J.Thomson Krishna N.Reddy United States Department of Agriculture Agricultural Research ServiceCrop Production Systems Research Unit141 Experiment Station RoadStonevilleMS 38776USA Department of Construction Engineering Superior Technology School1100 Notre-Dame Street WestMontrealQuebec H3C 1K3Canada United States Department of Agriculture National Institute of Food and AgriculturalDivision of Agricultural SystemsWaterfront Center80009th StreetSWWashingtonDC 20024USA

Rubidium chloride(RbCl)was used as a tracer tank-mixed with active ingredients to profile downwind deposition of aerially applied crop protection and production materials to characterize off-target drift,which helps improve spray efficiency and reduce environmental *** sheets were placed on a holder in the field at each sampling station to collect sprayed *** tracer was used to assess downwind drift of nozzles mounted on the booms installed and controlled on both sides of an agricultural *** experiment was conducted on a field covered by Bermuda grass(Cynodon dactylon).During the experiment,the airplane was planned to fly three passes with three replications at each of three different altitudes,3.7 m,4.9 m,and 6.1 m for total of 27 flight *** results indicated that sampling station location had a significant effect on RbCl ***,application release altitude was not significant to the change of *** practical application in the same aerial application system was used to assess crop injury from the off-target drift of aerially applied *** concentrations measured from Mylar sheets were correlated with visual injury,plant height,shoot dry weight,leaf chlorophyll content,and shikimate,which were measured from the leaves and plant samples ***,RbCl is an effective tracer for monitoring spray applications from agricultural aircraft and unmanned aerial vehicles to intensify agriculture output and minimize environmental impact.

关键词： Rubidium chloride(RbCl) precision agriculture spray efficiency off-target drift aerial application herbicide crop injury environmental pollution

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