عنوان مقاله [English]
This study was conducted to evaluate the water productivity of Amir kabir sugarcane agro-industry farms using landsat 8 satellite data. Actual evapotranspiration and yield of the final product were estimated using satellite data and then were compared with measures corresponding values collected from fields during 2012-2013 growing season. The total volume of sugarcane actual evapotranspiration during the growing season from 9328.5 hectares of cultivated farms was 160 million cubic meters and the yield of wet sugarcane was 520230 tons, which is equivalent to 56 tons per hectare. Average of water productivity for sugarcane according to the evapotranspiration and the irrigation water were 3.4 Kg/m3 and 1.6 Kg/m3 respectively. The water productivity data analysis in ARC-10 showed that there was a direct relationship between irrigation intervals of planted plots and water productivity. Therfore, it can be concluded that , by increasing irrigation intervals, and applying the same volume of irrigation water would cause, water productivity to increase. Also, the water productivity of CP48-103 variety was found to be higher than of CP69-1062 variety. The water productivity of sugarcane was inversely related to the age of the cultivated crops. As the age of the sugarcane crop increased from planting to R7, its water productivity decreased. It was concluded that the difference between the water productivity of various plot of Amirkabir sugarcane agro-industry farms could be attributed to the depth of applied irrigation,irrigation time and intervals, and also to the large difference between the ages of sugarcane plantations (plant to R7).