EVALUATION OF WATER PRODUCTIVITY INDICATORS IN WHEAT IRRIGATED FIELDS (CASE STUDY: NEYSHABUR PLAIN)

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DEHGHAN H.; ALIZADEH A.; ANSARI H.; HAGHAYEGHI MOGHADDAM S.A.

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Journal: Iranian Journal of Irrigation and Drainage Year:2011 | Volume:5 | Issue:2 Page(s): 263-275

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Title

EVALUATION OF WATER PRODUCTIVITY INDICATORS IN WHEAT IRRIGATED FIELDS (CASE STUDY: NEYSHABUR PLAIN)

Author(s)

DEHGHAN H. | ALIZADEH A. | ANSARI H. | HAGHAYEGHI MOGHADDAM S.A. | Issue Writer Certificate

Keywords

WHEATQ3

WATER PRODUCTIVITY INDICATORSQ2

IRRIGATION SCHEDULINGQ1

SWAP MODELQ2

NEYSHABUR PLAINQ2

Abstract

Because of the scarcity of water resources in Iran, agricultural water productivity indices measuring and analyzing is very important. Purposes of this study, are to simulate the components of water balance in field level, to predict moisture in soil profile and to analyze water productivity indices in WHEAT irrigated fields for NEYSHABUR PLAIN. Three WHEAT farms were selected at different parts of Neyshabour plain in 2008-2009. All required data for running SWAP MODEL were collected. The model was calibrated and validated for all soil hydraulic parameters and WHEAT agricultural characteristics in each field, separately. Results show that SWAP could predict moisture profiles satisfactorily, in different times and depths. Water productivity indices were calculated using components of water balance, by SWAP. Averages of these indices that hereafter we called as WPT (yield to crop actual transpiration ratio), WPET (yield to crop actual evapotranspiration ratio), WPETQ (yield to crop actual evapotranspiration plus deep percolation ratio) and WPIrr (yield to total applied water ratio) were 1.28, 0.99, 0.6 and 0.88, respectively. According to results of this study, it is possible to increase WHEAT yield by 14% if IRRIGATION SCHEDULING is planned correctly. Moreover, deficit irrigation by 30% show no significant effect on yield. These results indicate that using a appropriate IRRIGATION SCHEDULING, in addition to reducing consumptive water, WPETQ and WPIrr indices will increase up to 48 and 61 percent, respectively. High evaporation rete at initial stages of crop growth due to traditional irrigation method, has decreased WPET by 28% compared to WPT. The WPET value could be improved employing agricultural practices like mulching or using subsurface irrigation. Decreasing applied water depth did not have notable effect on WPET and WPT indices, but resulted in increasing WPETQ and WPIrr values remarkably.

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APA: Copy

DEHGHAN, H., ALIZADEH, A., ANSARI, H., & HAGHAYEGHI MOGHADDAM, S.A.. (2011). EVALUATION OF WATER PRODUCTIVITY INDICATORS IN WHEAT IRRIGATED FIELDS (CASE STUDY: NEYSHABUR PLAIN). IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 5(2), 263-275. SID. https://sid.ir/paper/131430/en

Vancouver: Copy

DEHGHAN H., ALIZADEH A., ANSARI H., HAGHAYEGHI MOGHADDAM S.A.. EVALUATION OF WATER PRODUCTIVITY INDICATORS IN WHEAT IRRIGATED FIELDS (CASE STUDY: NEYSHABUR PLAIN). IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2011;5(2):263-275. Available from: https://sid.ir/paper/131430/en

IEEE: Copy

H. DEHGHAN, A. ALIZADEH, H. ANSARI, and S.A. HAGHAYEGHI MOGHADDAM, “EVALUATION OF WATER PRODUCTIVITY INDICATORS IN WHEAT IRRIGATED FIELDS (CASE STUDY: NEYSHABUR PLAIN),” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 5, no. 2, pp. 263–275, 2011, [Online]. Available: https://sid.ir/paper/131430/en

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