AN INVESTIGATION ON THE POSSIBLE DIFFERENCES BETWEEN PRESENT CROPS WATER REQUIREMENTS AND NATIONAL DOCUMENTS OF IRRIGATION

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ERFANIAN M.; ALIZADEH A.; MOHAMMADIAN A.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Iranian Journal of Irrigation and Drainage Year:2011 | Volume:4 | Issue:3 Page(s): 478-492

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Title

AN INVESTIGATION ON THE POSSIBLE DIFFERENCES BETWEEN PRESENT CROPS WATER REQUIREMENTS AND NATIONAL DOCUMENTS OF IRRIGATION

Author(s)

ERFANIAN M. | ALIZADEH A. | MOHAMMADIAN A. | Issue Writer Certificate

Keywords

EVAPOTRANSPIRATIONQ1

IRRIGATION REQUIREMENTQ2

NATIONAL IRRIGATION CODESQ3

KHORASAN-RAZAVI PROVINCEQ2

Abstract

Volumetric allocations of agricultural water use in 129 agricultural plains of Iran are based upon the national codes or documents of irrigation. These documents are used by the ministries of Jehad-e-agriculture and energy for allocating agricultural water. National irrigation documents have been determined by the experts of these ministries and Iran meteorological organization. In these codes, recommended method of FAO and 25 years climatologically data of the synoptic stations of the period of 1970-1995 have been used. Since it seems a significant change on temperature, rainfall, and other parameters have been occurred during the last 15 years. These changes which may either be due to climate change or climate variability have a significant effect on agricultural water requirement. If this may be the case, a revision on irrigation codes will be inevitable. For this purpose an investigation was conducted to compare the effective meteorological parameters, reference crop EVAPOTRANSPIRATION, and crops water requirements between last 15 years (1995-2010) data and full period of data (1970-2010) with the data of the period of 1970-1995 that irrigation codes are based on that. In this study synoptic stations of KHORASAN-RAZAVI PROVINCE which is a semi-arid region were used. The results showed that if either last 15 years data is used or full period data, air temperature has increased, relative humidity and rainfall has decreased, and radiation and wind speed have also increased. Therefore, crop reference EVAPOTRANSPIRATION and crops water requirements have increased for most parts of the province. If full period data is used, ETo showed an increase up to 47% and if last 15 years data are used ETo showed an increase up to 48% in some part of the province. These results are an indicator for the necessity of revision in irrigation codes.

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APA: Copy

ERFANIAN, M., ALIZADEH, A., & MOHAMMADIAN, A.. (2011). AN INVESTIGATION ON THE POSSIBLE DIFFERENCES BETWEEN PRESENT CROPS WATER REQUIREMENTS AND NATIONAL DOCUMENTS OF IRRIGATION. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 4(3), 478-492. SID. https://sid.ir/paper/131502/en

Vancouver: Copy

ERFANIAN M., ALIZADEH A., MOHAMMADIAN A.. AN INVESTIGATION ON THE POSSIBLE DIFFERENCES BETWEEN PRESENT CROPS WATER REQUIREMENTS AND NATIONAL DOCUMENTS OF IRRIGATION. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2011;4(3):478-492. Available from: https://sid.ir/paper/131502/en

IEEE: Copy

M. ERFANIAN, A. ALIZADEH, and A. MOHAMMADIAN, “AN INVESTIGATION ON THE POSSIBLE DIFFERENCES BETWEEN PRESENT CROPS WATER REQUIREMENTS AND NATIONAL DOCUMENTS OF IRRIGATION,” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 4, no. 3, pp. 478–492, 2011, [Online]. Available: https://sid.ir/paper/131502/en

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