RICE CULTIVATION AND ITS ENVIRONMENTAL CONDITIONS IN THE MEDITERRANEAN COUNTRIES : II. Soils, Their Fertility and Mineralogy

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In Italy paddy soils have a broad variability with respect to region and age of the parent material. The regional characteristics, however, predominate over the age relations, i.e., the Po delta soils have higher potentialities than the youngest of those in the middle reaches of the Po. Among soils of the middle reaches the older the parent material, the more depleted the bases. Some of the better drained terrace soils have the morphology of "aquorizem." Spanish paddy soils along the Mediterranean coast are all alike, having an alkaline reaction due to the presence of free lime, and SiCL to SiC textures. Morphologically there are two types of paddy soils, one having gleyed subsoils due to groundwater influence, and the other having brown subsoils below strongly gleyed surface soils under submergence. Portugese paddy soils are generally similar to Spanish soils both in mode of occurrence and in nature, except for neutral to slightly acidic reaction and absence of free lime in the former. The general soil potentiality as judged from chemical and mineralogical studies is in the order of Spanish>Portugese>Italian paddy soils.
社団法人日本土壌肥料学会の論文