Science et changements planétaires / Sécheresse


Interannual variations of rainfall and sugarcane crop water uptake in Côte d‘Ivoire Volume 14, issue 1, Janvier 2003


See all figures

CNRA, Station de recherche de Ferké\Programme canne à sucre, BP 121 Ferké, Côte d‘Ivoire <kgo.cnraaviso.ci>. UFR Sciences de la terre et des ressources minières, Université d‘Abidjan‐Cocody, BP V 34 Abidjan, Côte d‘Ivoire

A long and relatively ancient rainfall data (1932‐1965) regarding regional climate is compared to another, more recent, relative to the local climate of sugar mills (1980‐1996 in Ferké 2 and 1981‐1997 in Zuénoula), so as to assess climate change. The rainfall frequency analysis shows a declining trend over the second period as compared to the first one. In both locations, the interannual variations in rainfall distribution and crop water satisfaction index (based on the rain regardless of any irrigation water applied) especially over the critical crop growing period (from March till July) were analysed. Crop water consumption was calculated using a water balance model. The crop material being considered was ideally a mid‐season sugarcane. As far as crop water consumption in both sugar mills over the recent period is concerned, a distinction is made between the years in terms of rainfall deficit or excess with regard to the critical growing season, by means of water balance calculations. More generally, global change in West Africa as well as worldwide involving some major factors is discussed.