Publications des scientifiques de l'IRD

Hammecker Claude, Van Asten P., Marlet S., Maeght Jean-Luc, Poss Roland. (2009). Simulating the evolution of soil solutions in irrigated rice soils in the Sahel. Geoderma, 150 (1-2), p. 129-140. ISSN 0016-7061.

Titre du document
Simulating the evolution of soil solutions in irrigated rice soils in the Sahel
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000265342800015
Auteurs
Hammecker Claude, Van Asten P., Marlet S., Maeght Jean-Luc, Poss Roland
Source
Geoderma, 2009, 150 (1-2), p. 129-140 ISSN 0016-7061
In Sahelian countries, agriculture often relies on irrigation especially for rice cropping which has been introduced these last decades. As most of the water resources used for irrigation (mainly rivers and lakes) have an alkaline composition, rice cropping is often held as responsible for soil alkalinization. In order to evaluate the probability for this process to occur, we studied 3 different sites in West Africa where numerical simulation of the geochemical interactions between soil, irrigation water and groundwater were performed with PHREEQC. It was possible to simulate the evaporation of the ponding water, the mixing between groundwater and irrigation water, the lateral drainage (flushing) and the leaching, and finally the management of the crop residues. By performing prospective simulations over 60 cropping cycles it has been shown that soil alkalinization and sodication are not inevitable in these areas especially if the cropping is properly managed. Moreover, when straw is removed and the plot flushed before the new cropping season, alkaline soils can even be improved with rice cropping.
Plan de classement
Pédologie [068] ; Sciences du monde végétal [076]
Identifiant IRD
fdi:010046038
Contact
  • Coordonnées :
    IST / IRD Ile-de-France
    32 avenue Henri Varagnat
    93140 Bondy Cedex
    France
    Horizon Pleins textes
  •