Saline soils are found all over the world and are mainly formed under the influence of dry or semi-arid climatic conditions and high temperatures. They are characterised by the presence of free soluble salts, which may often be present on the surface of the soil in the form of a thin surface layer. The accumulation of salts in soil is a phenomenon that has been occurring since time immemorial. It has created and continues to create serious problems with regard to the efficient use of soil, due to the degradation of its productivity. Today, huge areas of land all over the world are put out of cultivation every year because of extensive salinisation and the consequent deterioration in productivity. This problem is becoming more acute over time.