International Journal of Agricultural Policy and Research
Vol.2 (12), pp. 484-491, December 2014
Article 14/ID/ JPR219/08/ pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Water use efficiency and water productivity in the Spanish irrigation district “Río Adaja”
Illiassou Naroua, Leonor Rodríguez Sinobas* and Raúl Sánchez Calvo
Research group “Hydraulic for Irrigation”. Agricultural Engineering School, Technical University of Madrid (UPM).Ciudad Universitaria, 28040 Madrid (Spain).
*Corresponding Author E-mail: leonor.rodriguez.sinobas(at)upm.es
Tel: +34 913365675
A study of the assessment of the irrigation water use has been carried out in the Spanish irrigation District “Río Adaja” that has analyzed the water use efficiency and the water productivity indicators for the main crops for three years: 2010-2011, 2011-2012 and 2012-2013. A soil water balance model was applied taking into account climatic data for the nearby weather station and soil properties. Crop water requirements were calculated by the FAO Penman-Monteith with the application of the dual crop coefficient and by considering the readily available soil water content (RAW) concept. Likewise, productivity was measured by the indexes: annual relative irrigation supply (ARIS), annual relative water supply (ARWS), relative rainfall supply (RRS), the water productivity (WP), the evapotranspiration water productivity (ETWP), and the irrigation water productivity (IWP).The results show that in most crops deficit irrigation was applied (ARIS<1) in the first two years however, the IWP improved. This was higher in 2010-2011which corresponded to the highest effective precipitation Pe. In general, the IWP (€.m-3) varied among crops but crops such as: onion (4.14, 1.98 and 2.77 respectively for the three years), potato (2.79, 1.69 and 1.62 respectively for the three years), carrot (1.37, 1.70 and 1.80 respectively for the three years) and barley (1.21, 1.16 and 0.68 respectively for the three years) showed the higher values. Thus, it is highlighted they could be included into the cropping pattern which would maximize the famer’s gross income in the irrigation district.
Key words: irrigation water use assessment, crops, productivity indicators.