Vol. 9, Issue 5 (2020)

Author(s):
Mallikarjun Reddy, Ambrish Ganachari and Lokesh K

Abstract:
This paper estimate reference crop Evapotranspiration in Raichur region Karnataka using CROPWAT model. Determination of Evapotranspiration (ET) is important in application such as irrigation design, irrigation scheduling, water resource management, hydrology and cropping systems modeling. The penman montieth formulation is regarded as a good estimator for a wide variety of climatic conditions. The United Nations food agriculture organization (FAO) adopted the P-M method as global standard to estimate reference crop (ETo) from meteorological data. Based on the intensive study of this paper, monthly meteorological weather data recorded from 2013 to 2014 were used to obtain the result. The ETo data were calculated for each parameter and the obtained results were compared. Reference crop Evapotranspiration (ETo) and monthly effective rainfall was calculated using CROPWAT model. The study detects that penman – montieth is the best method to estimate ETo because of its inclusion of parameters in calculation.