ABSTRACT
According to the WRB, Cambisols cover 1500 million ha in the world, Luvisols cover 500 or 600 million ha and Planosols, 130 million ha. Also, on the soil map of the world produced by the Americans on the scale of 1:10 million, Western Europe is variegated with Inceptisols (approximately Cambisols) and Alfisols (Luvisols). These are very important soils for a large part of humanity. But only the Luvisols and Planosols will be discussed here. Cambisols, being less differentiated, are less important at the scientific level and will only be mentioned.
