Document Type : Research Paper

Authors

• M Dastoorani ¹
• S. Poormohammadi
• Mohammad Hassan Rahimian ²

¹ Associate Professor Yazd University, Faculty member, Faculty of Natural Resources, Yazd university;

² National Salinity Research Center

Abstract

Reliable estimation of actual evapotranspiration of the plants plays an important role on planning and optimization of water use especially in dry land environments, where water scarcity is an important problem. In this study, Surface Energy Balance Algorithm for Land (SEBAL) was used for estimation of actual evapotranspiration (ET_a) in Ardakan pistachio orchards, Yazd province, Iran. For this purpose, a time series of satellite images including 13 cloud free MODIS data were employed to generate actual ET map of pistachio orchards. Results of this study indicated that seasonal ET_a for pistachio trees was about 1150 mm, which was significantly less than the applied irrigation depth, Results of this study emphasize the necessity of a proper irrigation scheduling, irrigation interval, and depth in Ardakan pistachio orchards. Consequently, water productivity will improve and considerable amounts of water will be saved as the result of these improvements.

Keywords

• Actual evapotranspiration
• pistachio
• SEBAL
• MODIS