K. Arunadevi1*, M. Singh2, J. Ramachandran1and G.R. Maruthi Sankar3
1Department of Soil and Water Conservation Engineering, Agricultural Engineering college and Research Institute, TNAU, Coimbatore, Tamil Nadu, India
2Water Technology Centre, IARI, ICAR, New Delhi-110012, India
3Department Agricultural Statistics), CRIDA, ICAR, Hyderabad-500059, India
Email:arunadevi.k@tnau.ac.in
Received-02.12.2024, Revised-11.12.2024, Accepted-29.12.2024
Abstract: The estimation of crop evapotranspiration is very crucial to understand crop water requirement. There are many empirical methods are being adopted to calculate the crop evapotranspiration. A study was conducted at Indian Agricultural Research Institute, New Delhi to determine crop evapotranspiration of vegetable crops with two different approaches like percentage shaded area approach and crop co-efficient approach. In this study, the irrigation was scheduled according to real time soil moisture measurement based on tensiometer reading. The reference evapotranspiration (ETo) was calculated and compared with the crop evapotranspiration (ETc) of greenpea and okra. The estimated crop evapotranspiration (ETc) was less compared to reference evapotranspiration in both approaches. The estimated average ETo and ETc during green pea cultivation was 2.8 and 2.5 mm/day respectively. Similarly, the estimated average ETo and ETc during okra cultivation was 5.4 and 4.3 mm/day respectively. The crop evapotranspiration estimated by percentage area method was less compared to ETc calculated by crop coefficient approach.
Keywords: Crop evapotranspiration, Crop coefficient, Soil moisture, Tensiometer
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