IDENTIFICATION OF SUITABLE METHOD FOR CROP WATER ASSESSMENT BY ESTIMATING EVAPOTRANSPIRATION - A CASE STUDY

BASANAGOUDA F. RONAD¹*, SURESH H. JANGAMSHETTI^2
1Department of Electrical and Electronics, Jain University, Bangalore, 560026, India
²Department of Electrical and Electronics, Basaveshwar Engineering College, Bagalkot, 587103, India
* Corresponding Author : basugouda.ronad@gmail.com

Received : 19-06-2016     Accepted : 01-07-2016     Published : 18-10-2016
Volume : 8     Issue : 48       Pages : 2020 - 2023
Int J Agr Sci 8.48 (2016):2020-2023

Keywords : Irrigation Systems, Evapotranspiration, Crop Water, Extra Terrestrial Radiation, Temperature and Humidity
Academic Editor : Dr. P. B. Kalaburgi
Conflict of Interest : None declared
Acknowledgements/Funding : None declared
Author Contribution : None declared

This paper presents identification of suitable method for assessment of crop water requirements in the agriculture lands at Malaprabha Riverbed, Bagalkot, India (15.8N-75.5E). Climatic data required for assessment are collected for the selected site. In the present investigation, Blaney-Criddle, Christiansen, Hargreaves, Turc and Thornthwaite methods are employed to estimate evapotranspiration and resultant values are compared with standard reference Penman-Monteith estimated values for the said region. The evapotranspiration is obtained for four different seasons and comparative analysis is carried. Turc and Thornthwaite methods resulted in more deviation from reference and Blaney- Criddle, Hargreaves and Christiansen pan evaporation methods derived the results much closer to each other and standard reference. However, Blaney-Criddle method requires only air temperature data for analysis and yields optimum results. In view of this, Blaney-Criddle method is selected as most suitable method for the said location. Further, water requirement of various crops grown in North Karnataka region are assessed by using crop factors