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Título : Simulating the effects of extreme dry and wet years on the water use of flooding-irrigated maize in a mediterranean landplane
Autor : Utset Suástegui, A.; Martínez-Cob, Antonio ; Farré, Inmaculada; Cavero Campo, José
Palabras clave : Flooding irrigation
Climate variability
Maize water-use
Mechanistic modelling
Weather generator
Fecha de publicación : sep-2006
Editor: Elsevier
Citación : Agricultural Water Management 85 (1-2): 77-84 (2006)
Resumen: The effects of years of extreme rainfall events on maize water-use under traditional flooding irrigation in a Mediterranean landplane were estimated through a simulation assessment; combining a weather generator with an agrohydrological simulation model. Two options: “Fully Irrigation” and “Deficit Irrigation” were considered in the simulations as the extreme water-management situations. Besides, a 2-m depth shallow water table and Free Drainage were considered as the typical extreme situations that can be found at the bottom of the simulated soil layer. Thirty “Dry” (DY) and “Wet” (WY) years were randomly selected from the weather generator output. The model SWAP was used to simulate the Relative Transpiration (RT), i.e. ratio between actual and maximum maize transpiration, Actual Maize Evapotranspiration (ETC), Percolated Water and Capillary Rising during wet and dry years and for each of the irrigation and bottom condition options. According to the modelling results, average mean RT is about 80% and 90% in dry and wet years, respectively. RT and ETC variability are very high under dry conditions although such variability is notably reduced if a suitable irrigation option is considered. Capillary rising can play a very important role during dry years in those places where irrigation is not enough, but water table is relatively shallower. On the other hand, a shallower water table can carry out RT reductions during wet years, due to water excess, although these negative effects are comparatively lower than those produced by rain scarcity. Besides, percolated water during wet years is very high, particularly in well irrigated farms.
Descripción : The final editorial version is available at: http://www.sciencedirect.com/science/journal/03783774
Versión del editor: http://dx.doi.org/10.1016/j.agwat.2006.03.010
URI : http://hdl.handle.net/10261/3083
DOI: 10.1016/j.agwat.2006.03.010
ISSN: 0378-3774
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