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DOI Prefix 10.20431 |
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Evaluation of Radiation Methods for Calculating the Water
Requirement of Grass in Two Different Climates using REF-ET Software
Masoumeh Najafi1*, Mohammad Salarian1, Saeid Eslamian1, Kaveh Ostad-Ali-Askari2, Vijay P. Singh3, Nicolas R. Dalezios4
2.Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
3.Department of Biological and Agricultural Engineering &Zachry Department of Civil Engineering, Texas A and M University, 321 Scoates Hall, 2117 TAMU, College Station, Texas 77843-2117, U.S.A.
4.Laboratory of Hydrology, Department of Civil Engineering, University of Thessaly, Volos, Greece & Department of Natural Resources Development and Agricultural Engineering, Agricultural University of Athens, Athens, Greece.
Citation : Masoumeh Najafi, et.al, Evaluation of Radiation Methods for Calculating the Water Requirement of Grass in Two Different Climates using REF-ET Software International Journal of Constructive Research in Civil Engineering 2019, 5(1) : 1-7
Evapotranspiration plays a fundamental role in agricultural water management. Its calculation requires weather data, such as radiation, which are often not available and should be estimated indirectly. This study employed the Ref-ET software for estimating radiation for the period of 1970-2011 under two different climates of Rasht and Isfahan. Results showed that for Isfahan, the first method (minimum and maximum temperature difference) was satisfied with KRS=0.17, indicating good results. For Rasht, radiation was estimated using the third method (KRS) assuming KRS=0/44, and the evapotranspiration relative to the values of evapotranspiration in the presence of data was acceptable. Also, results of evapotranspiration derived from the Turque equation in Isfahan and results of the Penman-Monteith FAO relation for Rasht were more acceptable.