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Sharifian, H., Ghahraman, B., Alizadah, A., Mirlotfi, S. (2006). Evaluation of Different Radiation and Humidity Methods for Estimation of ETo and Analysis of Aridity Effects in Golestan Province. , 19(2), 275-285. doi: 10.22092/ijsr.2006.127465
H. Sharifian; B. Ghahraman; A. Alizadah; S. M. Mirlotfi. "Evaluation of Different Radiation and Humidity Methods for Estimation of ETo and Analysis of Aridity Effects in Golestan Province". , 19, 2, 2006, 275-285. doi: 10.22092/ijsr.2006.127465
Sharifian, H., Ghahraman, B., Alizadah, A., Mirlotfi, S. (2006). 'Evaluation of Different Radiation and Humidity Methods for Estimation of ETo and Analysis of Aridity Effects in Golestan Province', , 19(2), pp. 275-285. doi: 10.22092/ijsr.2006.127465
Sharifian, H., Ghahraman, B., Alizadah, A., Mirlotfi, S. Evaluation of Different Radiation and Humidity Methods for Estimation of ETo and Analysis of Aridity Effects in Golestan Province. , 2006; 19(2): 275-285. doi: 10.22092/ijsr.2006.127465

Evaluation of Different Radiation and Humidity Methods for Estimation of ETo and Analysis of Aridity Effects in Golestan Province

پژوهش های خاک
Volume 19, Issue 2, November 2005, Pages 275-285    PDF (290.11 K)
Document Type: Research Paper
DOI: 10.22092/ijsr.2006.127465
Authors
H. Sharifian1; B. Ghahraman2; A. Alizadah2; S. M. Mirlotfi* 3
1‍Ph .D. student in Irrigation Tarbiat Modarres University
2scientific staff member, School of Agriculture, Ferdowsi University, Mashad
3scientific staff member, School of Agriculture, Tarbiat Modarres University, respectively
Abstract
Reference evapotranspiration (ETo) is a term used for a grass/alfalfa medium under no-stress condition. ETo can be measured in lysimeters or estimated by the empirical equations. Due to lack of lysimetric data in Golestan province and taking FAO-Penman-Monteith (F-P-M) as a standard method, the radiation and humidity methods were compared with this standard method in synoptic stations of Golestan Province (Gorgan, Gonbad and Marave-Tappeh). In this evaluation, the data used were either raw data or corrected based on local and/or universal conditions. The results showed the accuracy order for these methods to follow the sequence Makkink, Turc, Jensen-Haise and radiation. The results also showed that Gorgan and Gonbad stations did not need any aridity correction, while the Maraveh-Tappeh had to be corrected. When estimated ETo values from radiation methods (e.g. J-H in Maraveh-Tappeh) were corrected by regression equation, the amounts obtained for these methods were applicable in Golestan. The humidity methods were not useful in Golestan, unless they were corrected by suitable regression equations in Gorgan and Gonbad stations.
Keywords
Reference evapotranspiration; Aridity; Golestan province
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