Abstract
This paper describes the effects of three levels of spraying fluid pressure, three levels of sprayer velocities, and three levels of vertical heights, on spray uniformity distribution on the undersurfaces of water sensitive papers. The University Boom Sprayer Test Bench designed in the Department of Farm Machinery & Power, University of Agriculture, Faisalabad, had been employed for the investigations of spray uniformity distribution. The recommended hollow cone nozzles for controlling cotton insect/pest were used. Average uniformity of coverage found was 90.8%, 73.7% and 32.6% at 30 cm, 50 cm, and 70 cm heights respectively. The increase in height from 30 to 50cm and 50 to 70cm decreased uniformity of coverage 18.8% and 56% respectively, indicating strong effect of water sensitive paper height on uniformity of coverage from nozzle. The pressure did not affect uniformity of coverage significantly. However, the increase in pressure from 300 to 400 kPa and 400 to 500 kPa increased uniformity of coverage 1.05 and 1.04 times respectively. The average spray uniformity of coverage values at 2.5 Km/hr, 4.0 Km/hr, and 5.5 Km/hr were 75.7%,66.7% and 54.7% respectively. Key words: Uniformity of coverage; nozzle; pressure; velocity; water sensitive paper (WSP)
