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Revista de Ciências Agrárias

Print version ISSN 0871-018X

Abstract

NUNES, J. M. et al. Effect on soil exchange complex from continuous irrigation. Rev. de Ciências Agrárias [online]. 2009, vol.32, n.1, pp.370-383. ISSN 0871-018X.

Being the main goal of this work the analysis of the changes in the soil exchange complex brought by the continued irrigation practice, we collect georeferenciatilly, in the 12400 ha constituting the Caia Irrigation Perimeter and adjacent areas (located in the Elvas and Campo Major region, Portalegre district, Portugal), 14280 topsoil samples (020 cm), which, after mixed 10 by 10, in a way that each aggregate sample represented 11.1 ha, were analyzed for soil exchange complex composition and for soil exchange capacity (CEC). With the use of appropriate software (Geographic Information Systems-GIS), it was possible to relate the results of individual samples analysed with the cultural system (rain feed, less than 15 years in irrigation, between 15 and 25 years in irrigation and more than 25 years in irrigation) and the soil group (Regosols, Cambisols, Vertisols, Calcisols, Luvisols and Fluvisols), and then analyze the influence of the cultural system in the soil exchange complex and how the different soil groups were influenced by irrigation. With the Vertisols exception, the results confirm a decline in soil exchange capacity, sum of bases and base saturation ratio values and an increase in the exchange sodium percentage, which tends to get worse over time, at least in the first 30 years of this practice.

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