Estimation of water unit cost, water use efficiency and water added value for major crops in Darab as an arid land

This study was carried out for determination of water unit cost per cubic meter and water use efficiency (WUE) as a major factor in dry land region and assessment of added value as an economic-ecological important factor for major crops (wheat, corn,cotton, orange) in Darab. Needed data was collected through 400 questionnaires from farmers, Jihad-agriculture organization and water region org. Economics-Engineering method used for accounts of economical estimation. Based statistics there were 5111 wells in all regions. Used water estimated with considering of efficiency. After estimating of water cost unit price and WUE, production function for assessment of water value added determined.Result indicated that mean of water unit cost with 15% profit for both of diesel and electro pump was 128 Rials. In addition result shown that WUE an added value in orange were the highest between all major crops in Darab.