Comparative performance evaluation of different types of sprayer in cotton crop
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Date
2019
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CCSHAU
Abstract
Self-propelled high clearance sprayer (HS), tractor operated gun sprayer (GS), and lever
operated knapsack sprayer (KS) were evaluated for its performance under local agro-climatic
conditions. To select suitable operational parameters the sprayers were initially evaluated at three
pressure levels and three heights and corresponding discharge, spray angle, swath width and spray
distribution pattern were observed under laboratory conditions and the optimized value of pressure and
target height were selected for the evaluation of the sprayers in field conditions. Self-propelled high
clearance sprayer, tractor operated gun sprayer and lever operated knapsack sprayer provided best
results at a pressure of 3 kg cm-2 and a height of 54.5 cm, 15 kg cm-2 and 54.5 cm and 3 kg cm-2 and 53
cm, respectively.
Under field conditions, the NMD, VMD and UC of Self-propelled high clearance sprayer
(HS), tractor operated gun sprayer (GS), and lever operated knapsack sprayer (KS) were found to be
55.57 μm, 198.34 μm, 3.58 and 60.73 μm, 213.18 μm, 3.60 and 52.98 μm, 217.72 μm, 4.35,
respectively. The area covered by droplets by self-propelled high clearance sprayer was 11.75 and
43.17 % higher than tractor operated gun sprayer (GS) and lever operated knapsack sprayer (KS),
respectively. The results were found significant (p= 0.0007). The volume of spray deposition by Selfpropelled
high clearance sprayer (HS) was significantly (p= 0.0026) 6.58 and 19.51 % higher than that
of GS and KS, respectively. The volume of spray deposition on top side of leaves was significantly
higher than bottom side of leaves in all cases irrespective of types of sprayer. The bio-efficacy of selfpropelled
high clearance sprayer (50.63 %) was higher than tractor operated gun sprayer (49.11 %) and
lever operated knapsack sprayer (47.57 %).
The field capacity of Self-propelled high clearance sprayer (HS), tractor operated gun sprayer
(GS), and lever operated knapsack sprayer (KS) was found to be 1.44, 0.82 and 0.078 ha h-1 with
efficiency of 67.74, 78.63 and 82.12 %, respectively. The cost of operation for HS, GS and KS was
found to be 632.76 Rs. ha-1, 504.78 Rs. ha-1 and 656.73 Rs. ha-1, respectively. The B:C ratio was found
to be 1.11, 1.98 and 1.83 for Self-propelled high clearance sprayer, tractor operated gun sprayer, and
lever operated knapsack sprayer. Self-propelled high clearance sprayer is a recommended technology
and showed best results in terms of uniformity, droplets size, area covered by droplets, volume of spray
deposition, bio-efficacy and highest field capacity.
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