Experiment of Shield Effects on Spray Breadth

The method of introducing shields had been testified to be economical and efficient in reducing the droplet drift caused by wind in the process of pesticide spraying.Six different kinds of mechanical spray shields were designed and tested in this study.Spraying experiments using nozzle 320 and nozzle 200 at speeds of 1.21,1.91,2.60,3.30 and 4.00 km/h were carried out in a tightly sealed lab to test the effectiveness of the foils.The average spray breadth centre and droplets uniformity using each shield and without shield were tested.The results indicated that on the average,the spray breadth of nozzle 320 increased 2.60%~22.29% when using shield #5 compared with using other shields and not using shield,while the average increase for nozzle 200 was 2.16%~32.71%.