EVALUATION OF FAO PROPOSED METHODS FOR ESTIMATING REFERENCE CROP EVAPOTRANSPIRATION IN THE KARKAJ AREA OF TABRIZ

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NEYSHABOURI M.R.; MORADI DALINI A.A.F.; JAFARZADEH A.A.; SADEGHI S.

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Journal: JOURNAL OF AGRICULTURAL KNOWLEDGE Year:2006 | Volume:15 | Issue:4 Page(s): 63-72

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Title

EVALUATION OF FAO PROPOSED METHODS FOR ESTIMATING REFERENCE CROP EVAPOTRANSPIRATION IN THE KARKAJ AREA OF TABRIZ

Author(s)

NEYSHABOURI M.R. | MORADI DALINI A.A.F. | JAFARZADEH A.A. | SADEGHI S. | Issue Writer Certificate

Keywords

CROP WATER REQUIREMENTQ4

EVAPOTRANSPIRATION MODELSQ4

REFERENCE CROP EVAPOTRANSPIRATIONQ2

Abstract

In order to evaluate FAO proposed methods for estimating REFERENCE CROP EVAPOTRANSPIRATION (ET0) in Karkaj area, an experiment was conducted at the Agricultural :Research Station of University of Tabriz in 1997. Grass (Loium perenne) planted as a reference crop and weekly (6 to 8 days) ET0 values were computed using water balance method. Climatic data such as air temperature, relative humidity and etc. were collected from a weather station about three km west of the experiment site, and weekly ET0 were also estimated by using various FAO methods proposed in 1977 and 1998 including adjusted Blaney-Criddle and Penman, radiation, class A pan and Penman-Monteith methods. Comparison between measured and estimated ET0 values were carried out by computing percent of error (E) for the cumulative ET, and root mean square deviation (RMSD) and correlation coefficient (R) for the weekly evapotranspiration. Water balance cumulative ET0 reached to 598.5 mm. Penman-Monteith resulting in 605.2 mm possessed only 1.11% error (E=1.1) in ET0 prediction. Values of E for the adjusted Blaney-Criddle and radiation methods were close to 5%. The corresponding figures for penman (adj.) and class A pan turned to be 20.8 and 24.6 percent, respectively, meaning that these two methods produced the largest error. in cumulative ET0 prediction. Regarding weekly ET0, Blaney-Criddle with RMSD of 10.73 and Penman-Monteith with 10.71mm showed the highest degree of accuracy in ET0 prediction. Class A pan with RMSD equal to 16.9 mm indicated the largest deviations in the weekly ETopredication comparing to the measured values. Highest correlation coefficient (R=0.94) between the two sets of ET0 (measured versus predicted) occurred for class A pan method. The R values for both Penman-Monteith and adjusted Blaney-Criddle was 0.92. Considering the difficulties that encountered in class A pan installation and its maintenance on standard conditions, It seems that Penman-Monteith method would be the first choice and adjusted Blaney-Criddle the second, in predicting both cumulative and weekly ET0 for the area of study.

Cites

THE ANALYSIS OF THE CROPWAT MODEL EFFICIENCY ESTIMATING WATER REQUIREMENT OF WHEAT IN THE WEST OF KERMANSHAH TOWNSHIPS OF THE ISLAMABAD GHARB, SARPOL ZAHAB AND RAVANSAR

References

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APA: Copy

NEYSHABOURI, M.R., MORADI DALINI, A.A.F., JAFARZADEH, A.A., & SADEGHI, S.. (2006). EVALUATION OF FAO PROPOSED METHODS FOR ESTIMATING REFERENCE CROP EVAPOTRANSPIRATION IN THE KARKAJ AREA OF TABRIZ. JOURNAL OF AGRICULTURAL KNOWLEDGE, 15(4), 63-72. SID. https://sid.ir/paper/28973/en

Vancouver: Copy

NEYSHABOURI M.R., MORADI DALINI A.A.F., JAFARZADEH A.A., SADEGHI S.. EVALUATION OF FAO PROPOSED METHODS FOR ESTIMATING REFERENCE CROP EVAPOTRANSPIRATION IN THE KARKAJ AREA OF TABRIZ. JOURNAL OF AGRICULTURAL KNOWLEDGE[Internet]. 2006;15(4):63-72. Available from: https://sid.ir/paper/28973/en

IEEE: Copy

M.R. NEYSHABOURI, A.A.F. MORADI DALINI, A.A. JAFARZADEH, and S. SADEGHI, “EVALUATION OF FAO PROPOSED METHODS FOR ESTIMATING REFERENCE CROP EVAPOTRANSPIRATION IN THE KARKAJ AREA OF TABRIZ,” JOURNAL OF AGRICULTURAL KNOWLEDGE, vol. 15, no. 4, pp. 63–72, 2006, [Online]. Available: https://sid.ir/paper/28973/en

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