Characteristics and Genesis of Low Humic Latosols

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Abstract
The soils belonging to the great soil group of Low Humic Latosols have developed on basic crystalline rock materials in a semiarid to subhumid climate of subtropical and tropical regions having a pronounced dry period. The soil profiles of this group are characterized by the development of a weak A1 horizon in a solum which is predominantly kaolin clay. The solum is uniform in its chemical and mineral composition. The kaolin group make up > 50% of the clay fraction, together with iron oxides and with small amounts of gibbsite.The silica/sesquioxide ratios of the clay fractions of the soils of the Low Humic Latosol group range from 1.1 to 1.7, with the majority of soils falling within the range of 1.30 to 1.55. The silica/alumina ratios range between 1.7 to 2.3, with an average of approximately 2.0.The physical properties of the soils of the Low Humic Latosol group are clays which have the physical properties characteristic of silty clay loams due to their high content of kaolin and iron oxide.

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