QUALITY CONTROL OF WATER OF THE SENEGAL RIVER FOR THE AGRICULTURAL USE (ROSSO, MAURITANIA).

The Senegal River?s water has important repercussions on hydraulic, hydro-chemical balances and the mobilizable hydrological resources which condition in the national socio-economic future of Mauritania. This river?s water is used as drinking water and water of irrigation without any preliminary control of healthiness. For these reasons we tried to carry out a physicochemical evaluation, to know whether this river?s water is suitable for irrigation. A hydrochimic analysis was carried out in five stations at the zone of the high delta of the Senegal River (city of Rosso, Mauritania) during every season (dry clod season, hot dry season and rainy season) of the years 2015?2016.These anal yes related to elements pH, electric Conductivity, Ca2+, Mg2+, Na+, K+, HCO3-, CL-, NO3-, RAS, Na%) in the water of the river. The analysis comprises volumetric analysis, spectroscopic, pH measures and Conductimeter. The interpretation of theresults, using Richards and Wilcox diagrams in comparison with the directives of FAO, shows that the river?s water is slightly salty, where its conductivity varies between (54?405?s/cm), and it undergoes a sodic chimsm with predominance of carbonate ions at the average (1,6m?q/l) and, thus, it belongs to the class C1 S1, C2 S1. This water is in general suitable for agricultural use, but it requires an updated quality control in particular the reduction of the domestic effluents located on the shore of this river.