Estimation of summer evapotranspiration of sugarcane plant in using the Climatologic data, Khuzestan province

Accurate and timely estimates of potential evapotranspiration have Vital for water resource planning and agriculture.In this study, to estimate evapotranspiration of sugarcane in the warm season in Khuzestan province is concentrated. The data used includes air temperature, relative humidity, wind speed and sunshine since the establishment of the station until 2014. At first, reference crop evapotranspiration values using the standard FAO Penman Monteith calculated and then use the available crop coefficient, evapotranspiration of sugarcane is estimated at different growth stages. The results show that the average evapotranspiration of sugarcane in Khuzestan province in the early stages of 3.35 mm per day in June and In the middle stages of growth and in the final stages of 10.46 mm and 6.28 mm per day. The value of this parameter in July in the early stages of 3.59 mm and 11.23 mm in the middle stages and in the final stages of growth at a rate of 6.74 mm per day, respectively.Finally evapotranspiration of sugarcane in August in the early stages of growth 3.56 mm per day and 11.12 mm in the middle stages of growth and development in the final stages of 6.67 mm per day, respectively. The maximum daily and monthly evapotranspiration in July and minimize it happened in June. The highest daily fluctuations and monthly evapotranspiration of sugarcane in the middle stages of growth and lowest its growth occurs in the early stages.