Development and evaluation of an engine operated walk type drop down sprayer for cotton crop
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
An engine operated walk type drop down sprayer was developed for spraying on
cotton crop. The developed sprayer had eight nozzles. Boom was developed in T-shape. Six
nozzles were attached on vertical part of the boom with three nozzles spraying in left
horizontal direction and other three spraying in right horizontal direction. The boom was
mounted on a wheel hand vehicle. Nozzle selected for the sprayer was tested under laboratory
conditions under different fluid flow pressures (7.5, 10 and 12.5 kg/cm2). The spray width,
spray angle and discharge rate of the nozzle were noted. The discharge rate increased from
611.47 ml/min to 829.53 ml/min; Spray angle increased from 75.7 to 83.0 degrees and swath
width varied from 85.1 to 99.8 cm with increase in pressure from 7.5 to 12.5 kg/cm2. The
sprayer was evaluated in the field at 10 kg/cm2 for three different forward speeds (1.5, 2.0 and
2.5 km/h) and three different plant height of cotton crop (1.0, 1.3 and 1.75 m) at Research
Farm of the Department of Farm Machinery and Power Engineering, PAU, Ludhiana The
spot size, area covered, droplet density and field capacity were recorded and analyzed. The
droplet density varied from 185.67 to 386 drops/cm2 for 1.5 km/h and at forward speed of 2.5
km/h, the droplet density varied from 53.33 to 286 drops/cm2. The maximum field capacity
was found to be 0.16 ha/h at forward speed of 2.5 km/h and at plant height of 1.0 m. The bioefficacy
of the developed sprayer was also evaluated at Krishi Vigyan Kendra, Goneana and
at farmer’s fields in village Goneana, district Shri Muktsar Sahib at three levels of forward
speed of 1.5, 2.0 and 2.5 km/h and at three heights of crop i.e. 1.0, 1.3 and 1.75 m and
compared with the knapsack sprayer. The population of whitefly was recorded before spray
and after three, seven and ten days of spray. The maximum percentage reduction over control
was found at forward speed of 2.0 km/h and at plant height of 1.0 and 1.3 m.
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