ECOLOGICAL GROUPING OF SOLANUM-ELAEAGNIFOLIUM - A PRINCIPAL WEED IN THE IRRIGATED TADLA PLAIN (CENTRAL MOROCCO)

In order to study the ecological relationships between Solanum elaeagn ifolium Cav. and the main biotic and abiotic factors in the irrigated arid Tadla plain (central Morocco), the theory of mutual information a nd corrected frequency profiles has been adopted. The main ecological factors taken into account in this study were the climate, soil, textu re, salinity, irrigation, type of land use and the intensity of farmin g. The growth and extension of S. elaeagnifolium was found to be contr olled by the arid and semi-arid Mediterranean climate, by soil type an d by technical and agronomic factors.