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Assessment of irrigation water management in the Genil-Cabra Cordoba, Spain irrigation district using irrigation indicators



Assessment of irrigation water management in the Genil-Cabra Cordoba, Spain irrigation district using irrigation indicators







This paper examines irrigation water management in the Genil-Cabra Irrigation District of the Province of Cordoba (southern Spain) using three irrigation indicators: relative irrigation supply (RIS), relative water supply (RWS), and relative rainfall supply (RRS). The three indicators are calculated both globally and by grouping the data according to crop type, irrigation method, soil texture, and plot size. Then, it is possible to determine the influence that each individual factor has on irrigation management and take subsequent measures to improve irrigation performance. All of the information regarding agronomic and hydraulic variables has been included in a geographical information system (GIS) to facilitate data management. The results show that irrigation is deficit given that the mean value of the RIS indicator is relatively low, around .6. However, the RWS indicator achieves higher mean values, normally above .8, indicating that evaporation demand can be met throughout the crop development cycle. The RRS indicator shows less variability with mean values around .4. This indicator, together with the RWS indicator permits the evapotranspiration fraction covered by rainfall to be determined. The mean values of the calculated indicators are very useful for gaining a better understanding of irrigator behavior and general irrigation trends, although the study sample is still insufficient to characterize a large irrigation area as a whole. Indicators according to crop type, irrigation method, soil texture, and plot size. The influence that each individual factor permits to improve irrigation performance. Irrigation is deficient given that the value of the RIS indicator is relatively low. RWS indicator achieves higher values indicating that evaporation demand can be met.

Accession: 036492261

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