Development and evaluation of a tractor-operated automatic gun sprayer for cotton crop

A tractor-operated automatic gun sprayer was developed for the cotton crop. The unit consists of frame structure, spray tank, horizontal triplex pump, control valves, nozzle, pressure gauge, strainer, hydraulic agitator and actuating mechanism. power to drive HTP pump taken from tractor take off (PTO) through a belt pulley. mechanism motor worm gear reduction. Two motors with 0.5 kW each (12 V dc) were used provide oscillation motion guns get battery. rotation angle is 30° horizontally. Provision also made fold boom while in transport. pattern could be adjusted based on application chemicals. This study conducted determine suitable nozzle orientation (0, 15 downwards) field crops. maintained by using metal protractor. laboratory experiments carried out actual plant. best maximum droplet density size as 15° downward. Leaf hopper [Amrasca biguttula (Ishida)] aphids [Aphis gossypii (Glover)] crop after 7th day spraying dinotefuran insecticide conventional 87, 86 58 %, 50 respectively. total cost required fabricate US$ 1008. operation operated found 4.7/ ha.