The study area of this study corresponds to fluviomarine fields with flood risk and the presence of hydromorphic soils in the Golfão Maranhense region. The soils of the area present slow drenage, proximity with the sea (salt source) and favorable conditions for flood, and evaporation processes. All these factors may increase the concentration of soluble salts and reduce productivity or make it inviable. We collected 38 soil samples in 22 points at variable depths, normally between 0 to 20 and 30 to 50 cm. The samples were air dried and their chemical and granulometric attributes analyzed. The soil of Golfão Maranhense presents high variability of chemical and granulometric attributes, and is predominant with high exchange capacity, high sum of bases, and high concentration of hydrogen and aluminum. The magnesium concentration predominates in relation to calcium. Even though the majority of soils present clay texture, granulometry is highly variable. Despite the high concentration of magnesium and sodium, the soil flocculation degree is considered high. The soils of Golfão Maranhense are not salinized, but an appropriate management is necessary so not to promote its salinization.
hidromorphic soils; flood plains; high clay activity
