APPLICATION OF DIFFERENT CASES OF HARGREAVES-SAMANI AND JENSEN- HAISE METHODS FOR ESTIMATING ALFALFA REFERENCE CROP EVAPOTRANSPIRATION IN ISFAHAN

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NAJAFI PAYAM

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Paper Information

Journal: AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE) Year:2007 | Volume:2 | Issue:5 Page(s): 57-68

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Title

APPLICATION OF DIFFERENT CASES OF HARGREAVES-SAMANI AND JENSEN- HAISE METHODS FOR ESTIMATING ALFALFA REFERENCE CROP EVAPOTRANSPIRATION IN ISFAHAN

Author(s)

NAJAFI PAYAM | Issue Writer Certificate

Keywords

REFERENCE CROP EVAPOTRANSPIRANSPIRATIONQ3

ALFALFAQ3

HARGREAVES-SAMANIQ3

JENSEN-HAISEQ3

EXTRATERRESTRIAL RADIATIONQ3

HARGREAVES-SAMANI COEFFICIENTQ3

Abstract

Estimation of the actual evapotranspiration rate is very important for designing irrigation systems, storage construction and water conveyance structures. Many methods have been developed for estimating reference crop evapotranspiration. Most of these methods need different climatic parameters, but providing all of the necessary data for ET0 is not always available and if provided, these data may not be completely correct. Therefore some methods have developed to estimate ET0 using minimum data such as HARGREAVES-SAMANI and JENSEN-HAISE methods. In this research four different cases of each two mentioned methods were compared on the basis of lysimetric data of ALFALFA reference crop, obtained from climatic and agricultural research station of kabutarabad, Isfahan. The results revealed increased precise evaluation of evapotranspiration rate of ALFALFA reference crop up to 15 percent using Samani-Pressarakly equation for calculating extra terrestrial radiation. In addition, mentioned cases had higher correlation coefficients than others so that average maximum absolute relative error (MART) decreased to 9 percent due to improving the main equations with linear regression. Consequently, the results showed that there were no significant differences between Allen and Samani-Pessarakly equations for evaluating HARGREAVES-SAMANI equation coefficients.

Cites

THE ZONATION OF ARIDITY INTENSITY IN IRAN USING HARGREAVES- SAMANI EVAPOTRANSPIRATION MODEL BASED ON DIGITAL ELEVATION MODEL (DEM)

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APA: Copy

NAJAFI, PAYAM. (2007). APPLICATION OF DIFFERENT CASES OF HARGREAVES-SAMANI AND JENSEN- HAISE METHODS FOR ESTIMATING ALFALFA REFERENCE CROP EVAPOTRANSPIRATION IN ISFAHAN. AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE), 2(5), 57-68. SID. https://sid.ir/paper/166777/en

Vancouver: Copy

NAJAFI PAYAM. APPLICATION OF DIFFERENT CASES OF HARGREAVES-SAMANI AND JENSEN- HAISE METHODS FOR ESTIMATING ALFALFA REFERENCE CROP EVAPOTRANSPIRATION IN ISFAHAN. AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE)[Internet]. 2007;2(5):57-68. Available from: https://sid.ir/paper/166777/en

IEEE: Copy

PAYAM NAJAFI, “APPLICATION OF DIFFERENT CASES OF HARGREAVES-SAMANI AND JENSEN- HAISE METHODS FOR ESTIMATING ALFALFA REFERENCE CROP EVAPOTRANSPIRATION IN ISFAHAN,” AGROECOLOGY JOURNAL (JOURNAL OF NEW AGRICULTURAL SCIENCE), vol. 2, no. 5, pp. 57–68, 2007, [Online]. Available: https://sid.ir/paper/166777/en

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