Laterite residual soil

Figure 9.4 The relationship between pH and % soluble Cd (A), % exchangeable Cd (O), % Cd bound to organic matter (A), % Cd bound to oxides ( ) and % residual Cd ( ) in (a) and (b) a yellow earth (soil 1) and (c) and (d) a lateritic podzolic soil (soil 2). Cd application rates 0.8mgkg 1 (a) and (c) and lOmgkg-1 (b) and (d).

Laterite i a reddish residual soil, developed in humid tropical and subtropical regions. It contains iron, aluminum and other metal hydroxides. The Laterite soil group was dropped in a... 

LATERITE. The suh-aerial decay of rocks in tropica) regions, ha mg a distinctly moist or rainy climate, results in the development of a residual, reddish, and usually sticky soil frequently containing concretions. The principal products of laicri/alion are the hydrated oxides of aluminum and iron cither in the crystalline ur amorphous form. If the concentration of iron oxide is sufficiently high the laicrite may be valuable as an iron ore. If. on the other hand, the concentration of alumina is high the laleritc may he valuable as an ore ol that metal. 

Little, A.L. 1969. The engineering classification of residual tropical soils. Proceedings of Specialty Session on the Engineering Properties of Lateritic Soil, 7th International Conference on Soil Mechanics and Foundation Engimering, Mexico City. 1 1-10. 

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