Jan Nesar, F., Khashei-Siuki, A., Hashemi, S., Moradi Kashkooli, S. (2017). Presenting an empirical model for determining the sugar beet evapotranspiration by GDD parameter (Case study: Torbat-Jam, Iran). Water Harvesting Research, 1(1), 22-31. doi: 10.22077/jwhr.2017.374
Fateme Jan Nesar; Abbas Khashei-Siuki; Seyed Reza Hashemi; Shahla Moradi Kashkooli. "Presenting an empirical model for determining the sugar beet evapotranspiration by GDD parameter (Case study: Torbat-Jam, Iran)". Water Harvesting Research, 1, 1, 2017, 22-31. doi: 10.22077/jwhr.2017.374
Jan Nesar, F., Khashei-Siuki, A., Hashemi, S., Moradi Kashkooli, S. (2017). 'Presenting an empirical model for determining the sugar beet evapotranspiration by GDD parameter (Case study: Torbat-Jam, Iran)', Water Harvesting Research, 1(1), pp. 22-31. doi: 10.22077/jwhr.2017.374
Jan Nesar, F., Khashei-Siuki, A., Hashemi, S., Moradi Kashkooli, S. Presenting an empirical model for determining the sugar beet evapotranspiration by GDD parameter (Case study: Torbat-Jam, Iran). Water Harvesting Research, 2017; 1(1): 22-31. doi: 10.22077/jwhr.2017.374
Presenting an empirical model for determining the sugar beet evapotranspiration by GDD parameter (Case study: Torbat-Jam, Iran)
1Graduated student of Department of Water Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran.
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3Assistant Professor of Department of Water Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran.
4M.Sc. Student of Irrigation and Drainage, Department of Water Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran.
Abstract
So far, various methods have been presented for determining reference crop evapotranspiration in different parts of the world. The most popular and prestigious of them are probably the combined methods of Penman family, modified Blany-Criddle, Hargreaves - Samani and thornthwaite. Due to lack of lysimeter data in many parts of Iran, presenting an equation according to the regional condition with high precision is very paramount. The purpose of this paper is to present a method with higher precision for determining the evapotranspiration of sugar beet by using the meteorology and GDD (Growing Degree Day) parameters in Torbat_Jam, Iran. Determined methods were evaluated with FAO- Penman- Monteith method as a standard model. RMSE, R2 and Nash-Sutcliffe, and NS indexes were used for comparing fitness indexes. Results showed that equation 4 is appropriate for calculating crop water requirements, also R2, RMSE, and Nash-Sutcliffe coefficient were 0.683, 1.117 and 0.99, for equation 4, respectively.
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