Abstract:
In agriculture, water is the most important factor. Water is supplied to the crops naturally through precipitation and subsurface moisture, but when these supplies prove to be inadequate for crop use, growers must resort to irrigation. In recent years water availability were the major issue faced in Tamil Nadu. This is because of abnormalities in climatic conditions. So identifying evapotranspiration for the crop is important. Evapotranspiration is the movement of water through evaporation from the soil surface and transpiration from the plant into the atmosphere. By forecasting daily evapotranspiration for crops the irrigation pattern can be modeled. For our study rice crop is selected to forecast the evapotranspiration. Rice is a staple food for a large number of people and is the single largest food source for the poor. The weather parameters were observed for the pishanam season for two years (2020-2022). Evapotranspiration was calculated using three models like 1948 penman model, the Penman-Monteith model and the FAO56 Penman-Monteith model. Using less RMSE(3.41) and a high R square (0.98) value FAO 56 Penman-Monteith model was identified as best model for forecasting evapotranspiration.