CROP COEFFICIENT OF SUGAR BEET FOR ISFAHAN REGION

Sugar beet was planted in two lysimeters and the reference crop (lawn) was planted in another three lysimeters. The potential crop evapotranspirations of sugar beet and reference crop were determined for two years in 10-day periods. The 10-day, monthly and seasonal crop coefficients of sugar beet were also estimated. Maximum crop coefficient was 0.98 at about 100-110 days after planting which declined to 0.74 at the end of the growing season.