Determination of Crop Water Requirements for the Rice in the Veeranam Tank Irrigation Command Area

Abstract

A study was conducted to determine how much water needs for rice crops in the Veeranam Tank Irrigation Command Area of Cuddalore district, Tamil Nadu, India.  Rice, groundnut, sugarcane, banana and betel are the most important crops in and around the study area.  CROPWAT 8.0 was used to look at 20 years of weather data to determine how much water the rice required.  The rice was planted during the 2021 kuruvai season, and the crop coefficient was found.  The FAO Penman-Monteith method was used to figure out crop evapotranspiration (ETo), and the USDA S.C. method was used to determine effective rainfall.  In the study area, reference evapotranspiration (ETo) ranged from 3.66 to 5.81 mm/day.  Crop evapotranspiration (ETo) and crop water requirement varied from 0.70 mm/day to 6.01 mm/day and 0.0 mm/dec to 269.4 mm/dec for rice. The average CWR is identified as 679.3 mm/dec