Browsing by Autor "Jean Vacher"
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Item type: Item , Could deficit irrigation be a sustainable practice for quinoa (Chenopodium quinoa Willd.) in the Southern Bolivian Altiplano?(Elsevier BV, 2008) Sam Geerts; Dirk Raes; Ligia García; Octavio Condori; Judith Mamani; Roberto Miranda; Jorge Cusicanqui; Cristal Taboada; Edwin Yucra; Jean VacherItem type: Item , Introducing deficit irrigation to stabilize yields of quinoa (Chenopodium quinoa Willd.)(Elsevier BV, 2008) Sam Geerts; Dirk Raes; Ligia García; Jean Vacher; Richard Mamani; Jorge Mendoza; Ruben Huanca; Bernardo Morales; Roberto Miranda; Jorge CusicanquiItem type: Item , La valorisation agricole de l'eau des lacs collinaires : cas du lac collinaire Kamech (Tunisie)(Centre National de la Recherche Scientifique, 2006) Radhoua Mougou; Mohsen Mansour; Jean Vacher; Pierre CellierNational audienceItem type: Item , Modeling the potential for closing quinoa yield gaps under varying water availability in the Bolivian Altiplano(Elsevier BV, 2009) Sam Geerts; Dirk Raes; María Cruz García-González; Cristal Taboada; Roberto Miranda; Jorge Cusicanqui; Teddious Mhizha; Jean VacherItem type: Item , Quinoa(University of Copenhagen, 2012) Sam Geerts; Magali García; Sven-Erik Jacobsen; Jean Vacher; Thierry Winkel; Daniel BerteroItem type: Item , Subsurface Transfer of Chloride After a Lake Retreat in the Central Andes(Wiley, 2001) Anne Coudrain; Amal Talbi; E. Ledoux; Michel Loubet; Jean Vacher; Edson RamírezThe area under study covers 3500 km2 in the upstream part of the closed catchment basin of the salt crust of Uyuni. This crust is a remnant of the saline Lake Tauca, which covered the area about 15,000 years ago. In the downstream part of the aquifer, the Cl concentration of ground water and Cl content in the unsaturated zone exceed 20 meq/L and 18 kg/m2, respectively. With the present hydrological conditions under semiarid conditions, the ground water residence time in the study area exceeds 3000 years. Transient simulations over 11,000 years were made using initial conditions as the retreat of Lake Tauca and taking into account a low recharge during the arid mid-Holocene period. The modeling simulates ground water flow, Cl transport, and ground water residence time. It includes the evaporation from the aquifer that leads to the accumulation of chloride in the unsaturated zone. Results of the modeling are consistent with the observations if it is assumed that the Cl previously accumulated in the unsaturated zone was flushed back into the aquifer around 2000 years B.P., contemporaneously with the end of the arid period.