Currently, the majority of developing countries suffer from a food insufficiency crisis due to water management added to the phenomena of desertification and soil salinity. Soil salinity is a complex phenomenon involving several factors. In Algeria, more than 20% of irrigated soils are affected by the problem of salinity, this area is experiencing serious problems of degradation of its physical environment which is mainly due to soil salinization. Soil salinization at the plot level was monitored in five farms over 43 months between May 2009 and December 2012. The choice of five plots was made taking into account, irrigation practices, the existence or absence of drains, the quality of irrigation water and soil salinity. The aim of this work is to study the dynamics of salinity at the plot scale in a punctual way according to the couple irrigation-precipitation under different agricultural practices and various conditions of the physical environment. The results obtained show that for all the plots, soil salinity increases systematically during the irrigation period, which coincides with the summer period of high evaporation, and also decreases systematically during the rainy period, regardless of the practices and environmental conditions. For drained plots, winter leaching reaches 80% of salts belonging to the surface layers (0 20 cm). The influence of water quality is evident in the non-drained situation and/or when the texture is heavy. The action of texture appears in the case of undrained soils where clay soils show a more pronounced upward trend than medium-textured soils (sandy loam). The type of crops, which are themselves chosen according to the nature of the soil and the quality of the water, does not seem to play a significant role in soil salinity. Finally, it appears that the role of drainage and rainfall are those that have the greatest influence on the control and dynamics of salinity in the lower-Cheliff plain.