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Sustainable Agriculture and the Environment in the HUMID TROPICS
TABLE 1-2 Geographical Distribution of Soils of the Humid Tropics (in Millions of Hectares)a
a Based on dominant soil in maps (scale of 1:5 million) of the Food and Agriculture Organization (FAO) of the United Nations.
b From Sanchez and Cochrane (1980) plus recent adjustments.
c From the FAO (1975) and Dudal (1980).
d From the FAO (1977, 1978). Includes 46 million ha of the humid tropics of Australia and Pacific Islands.
e Saline soils only (Salorthids).
SOURCE: National Research Council. 1982. Ecological Aspects of Developmentin the Humid Tropics. Washington, D.C.: National Academy of Sciences.
and are also found in Central America, the Amazon Basin, and humid coastal Brazil. Ultisols are usually deep, well-drained red or yellowish soils, somewhat higher in weatherable minerals than Oxisols but also acidic and low in nutrients.
Inceptisols and Entisols account for most of the remaining soils of the humid tropics (about 16 percent and 14 percent, respectively). These are younger soils, more limited in distribution, and range from highly fertile soils of alluvial and volcanic origin to very acidic and nutrient-poor sands.
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