Premium
Classification and Use of Tropical Soils
Author(s) -
Greene H.
Publication year - 1946
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1946.03615995001000c00067x
Subject(s) - citation , government (linguistics) , service (business) , library science , history , computer science , philosophy , linguistics , economics , economy
SOILS OF THE SUDAN In 1939, a short account (5,) of the soils of Equatoria Province in the southern Sudan appeared in Soil Research. Owing to the war, it has not yet been possible to prepare a more detailed account, but some aspects, bearing on soil classification, can be presented in outline. Fig. i shows for conditions of high and low rainfall the'topographical distribution of soils formed (a) from acid crystalline rock and (b) from previously weathered material. The soils are grouped in four catenas. The main features are: A. Acid crystalline rock, represented on the left side of the diagram, can yield either a "red loam", i. e., a deeply leached red soil of notably open structure of which the clay is mainly kaolinitic, or a dark alkaline calcareous clay which is mainly montmorillonitic. The red loam is formed under high rainfall, silica and bases being removed in the drainage water. Under low rainfall, fine material is carried on to wide plains which are waterless for most of the year. Silica and bases leached from the upland soils are, in part, re-deposited in the lowland clays, and it seems likely