Précipitation de la fluorine et contrôle géochimique du calcium dans des sols alcalins du Niger : conséquences pour une estimation quantitative de l'évolution géochimique des sols

Fluorite precipitation was identified in non-saline alkali soil of Niger. The phenomenon strengthens the geochemical control of calcium, initiated by calcite formation. The precipitation of these two minerals leads us to use the generalised residual alkalinity concept to assess quantitatively the soil evolution under irrigation. The chemical evolution of an alkali soil under the influence of a silage irrigated cultivation is presented.