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The region includes from the Baixada Maranhense soils with high fertility and large agricultural potential. Although there is not adequate to increase productivity management system. This work aims to characterize chemically four soils (Vertisols) collected in the region and compare with a control soil (Argisolo). In a greenhousecultivated maize seedlings in the four soils. Analysis revealed high levels of nutrients and Al contents when compared with the ground control. At the same time, there was a high root growth, a common situation for plants grown in soils with low levels of aluminum. However, even at high levels of aluminum plant growth (the four soils) was not affected. This behavior can be explained by the presence of calcium and magnesium, which inhibit the aluminum toxicity in plants

PRESENCE OF THE EXCHANGEABLE ALUMINIUM IN LOWLAND SOILS COLLECTED IN THE MARANHÃO STATE