Vol. 9 (2) : March-April 2018 issue
Green Farming Vol. 9 (2) : 387-389 ; March-April, 2018
Development of crop water stress index for onion (Allium cepa L.) crop using infrared thermometry
AMITKUMAR L. DAVARIYAa1*, S.R. BHAKARa2, M. KOTHARIa3 and R.S. SINGHb4
aDepartment of Soil & Water Engg., College of Technology & Engineering, MPUAT, Udaipur - 313 001 (Rajasthan), bNational Bureau of Soil Survey & Land Use Planning, Udaipur - 313 001 (Rajasthan)
Designation : 1Research Scholar *(amit.davariya@gmail.com), 2Professor, 3Assoc. Professor, 4Principal Scientist and Head
Subject : Water and Natural Resource Management, Water Conservation Engg., Water Harvesting, Farm Pond, Sewage Water, Irrigation
Paper No. : P-7182
Total Pages : 3
Received : 21 February 2018
Revised accepted : 20 March 2018
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Citation :
AMITKUMAR L. DAVARIYA, S.R. BHAKAR, M. KOTHARI and R.S. SINGH. 2018. Development of crop water stress index for onion (Allium cepa L.) crop using infrared thermometry. Green Farming Vol. 9 (2) : 387-389 ; March-April, 2018
ABSTRACT
A field experiment was conducted during rabi seasons of 2014-15 at Plasticulture Farm of the College of Technology and Engineering (CTAE), Udaipur (Rajasthan) to develop crop water stress index (CWSI) for onion crop using infrared thermometry. In the experiment two bed of onion crop under water stressed and non-water stressed condition were taken and intensive observation of canopy (Tc) temperature, air (Ta) temperature, relative humidity (RH) and vapour pressure deficit (VPD) were recorded for onion crop at mid growth stage. The lower (non-water stressed) and upper (fully water stressed) baselines were determined from the canopy and air temperature data obtained using infrared thermometry and VPD under fully watered and maximum water stressed crop, respectively. The canopy–air temperature difference (Tc-Ta) and VPD resulted linear relationships and lower baseline for mid stage growth of onion crop were found (Tc-Ta) = - 0.7645(VPD) - 1.7932 with coefficient of determination (R2) 0.81. The developed equation can be used for monitoring plant water status and planning irrigation schedule for onion crop.
Key words :
Canopy temperature, Crop water stress index, Infrared thermometry, Onion, Vapour pressure deficit.
