Estimation of Water Demand of Agriculture Sector by Water-Yield Function (Case Study: Sistan Province)

محورهای موضوعی : Environmental policy and management

Zahra Ghaffari Moghadam ¹ (Institute of Agricultural Center at the University of Zabol.)

تاریخ دریافت : 1394/09/25 تاریخ پذیرش : 1394/09/25 تاریخ انتشار : 1394/09/10

کلید واژه: demand function, Wheat, Barely, Profit function, Water- yield production function,

چکیده مقاله :

In this study, yield-water and profit function was used to obtain water demand function in agriculture sector. The results showed that the ratio of actual to potential Evapotranspiration had positive, significant effecton the ratio of actual to potential yield for wheat and barley. Also, square ratio of actual to potential Evapotranspiration had negative, significant relationship. After estimation of product function, water demand function for agriculture sector was obtained by profit function. Price elasticity of water demand for agriculture was -1.10 being less than -1 and showing that price policies can be an important factor in the control of non-optimum use of their valuable inputs.

چکیده انگلیسی:

در این مطالعه با استفاده از تابع آب- عملکرد و تابع سود، تابع تقاضا آب برای بخش کشاورزی در منطقه سیستان بدست آمد. نتایج حاصل از تخمین تابع تولید نشان می­دهد نسبت تبخیر و تعرق واقعی به پتانسیل اثر مثبت و معنی­داری روی نسبت عملکرد واقعی به پتانسیل برای محصول گندم وجود دارد و با توان دوم نسبت تبخیر و تعرق واقعی به پتانسیل رابطه منفی و معنی­داری دارد. چنانچه این نسبت افزایش یابد نسبت عملکرد کاهش می­یابد. پس از بدست اوردن توابع تولید، با استفاده از تابع سود، تابع تقاضا برای بخش کشاورزی نیز بدست آمد. کشش قیمتی تقاضای آب برای بخش کشاورزی 10/1- برآورد شد کوچکتر بودن مقدار این کشش از منفی یک نشان می­دهد که سیاست­های قیمتی می­توانند عامل مهمی در کنترل مصرف غیر بهینه این نهاده با ارزش باشند. 

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