Speakers - AFHWC2025

Abstract

The village of khoyane is an important agricultural area in the Niayes zone where crop irrigation is facing soil salinisation. This study aims to characterize the geochemical facies of groundwater, and to examine their suitability for irrigation and their spatio-temporal evolution. To do this, water samples were taken according to Rodier's techniques and their physico-chemical characteristics determined. The results showed that the SAR reveals generally low levels of sodium. Salinity levels are relatively variable, ranging from high to excessive salinity. A longitudinal geochemical sequence with a dominant salinity type ranges from the hyper sulphated-calcic facies upstream (near Tanma Lake), to the bicarbonate-calcic facies downstream. In spite of the salinity, the soils are fertile, with acceptable irrigation water, but this requires prior control. Keywords: Khoyane; Salinisation; Hydrochemical study; Water;  Physico-chemical; Soil