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The purposes of this study were to develop a dual crop coefficient (Kc) using FAO-56 methodologies and to compare crop evapotranspiration (ETc) measured under field conditions for second-crop silage maize in the Southeastern Anatolia Region of Turkey with the ETc estimated using FAO-56 dual Kc methodologies. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2018) 42: 272-280 © TÜBİTAK doi:10.3906/tar-1712-10 http://journals.tubitak.gov.tr/agriculture/ Research Article Possibilities of using dual Kc approach in predicting crop evapotranspiration of second-crop silage maize 1 1, 2 Neşe ÜZEN , Öner ÇETİN * , Ramazan YOLCU Department of Agricultural Structures and Irrigation, Faculty of Agriculture, Dicle University, Diyarbakır, Turkey 2 Regional Directorate of State Hydraulic Works, Diyarbakır, Turkey 1 Received: 04.12.2017 Accepted/Published Online: 06.04.2018 Final Version: 07.08.2018 Abstract: The purposes of this study were to develop a dual crop coefficient (Kc) using FAO-56 methodologies and to compare crop evapotranspiration (ETc) measured under field conditions for second-crop silage maize in the Southeastern Anatolia Region of Turkey with the ETc estimated using FAO-56 dual Kc methodologies. For this study, field experiments were conducted in the 2011 and 2012 growing seasons, and the results were evaluated. To compute dual Kc (Kcb and Ke), all climatological data involving the seedling and harvesting dates, growth stages, water holding of soil at field capacity and at wilting point, soil evaporation layer, and crop characteristics were input into a spreadsheet program. The crop stages observed were 15, 25, 40, and 12 days for the initial, crop development, midseason, and late-season stages, respectively, in 2011, and 12, 23, 43, and 13 days, respectively, for the same stages in 2012. The reference evapotranspiration (ETo) was computed daily using the Penman–Monteith equation. All main and intermediate calculations for the dual Kc and its components Kcb and Ke were based on the FAO-56 guidelines. The Kcb values were computed as 0.15, 1.27, and 0.62 for the initial, midseason, and late-season stages, respectively. However, these figures were 0.15, 1.15, and 0.5 in the FAO-56 in the same order. The dual Kc was 0.64, 1.27, and 0.67 in this
