1990 Volume 5 Issue 1 Pages 1-5
Tests on the efficiency of two hand-compressed air sprayers were carried out with special reference to relationship between the pressure and the amount of discharge, and numbers of pumping to keep pressure fixed on 20Lbs per square inch.
Twenty Lbs of the pressures were obtained when 15 pumpings were done in a B & G's sprayer and 11 in a Semuco's sprayer, both having 2 gallons capacities.
When using B & G's sprayer, it was necessary to pump one time in every 80ml spray in 800067 fan nozzle and 100ml in 500100 fan nozzle to keep pressure at 20Lbs.
The pressure more than 20Lbs seemed to decrease an amount of emulsion remained onto a surface, as well as a small stream was formed when EC emulsion was sprayed on an unpenetrated surface at a rate of 50ml/m2, whereas the same amount of tap water did not form any stream, when they sprayed at the pressure of 20Lbs with a few exception.
A fan nozzle which put out on a plywood striked in a Saturn shape, although it is written to strike in a straight line in previous publications. It is recomended, therefore, to apply insecticide so as to lie it upon another by one third, if it is desired to spray uniformly.
