estimation of water demand of agriculture sector by water-yield function (case study: sistan province)

In this study, yield-water and profit function was used toobtain water demand function in agriculture sector. theresults showed that the ratio of actual to potential evapotranspirationhad positive, significant effect on the ratio of actualto potential yield for wheat and barley. also, square ratio ofactual to potential evapotranspiration had negative, significantrelationship. after estimation of product function, water demandfunction for agriculture sector was obtained by profit function.price elasticity of water demand for agriculture was -1.10being less than -1 and showing that price policies can be animportant factor in the control of non-optimum use of theirvaluable inputs.