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Agroforestry Systems 8: 1--6, 1989. | © 1989 Kluwer Academic Publishers. Printed in the Netherlands. Agroforestry systems and soil surface management of a tropical aifisol R. LAL Department of Agronomy, The Ohio State University, Columbus, OH 43210, USA Key words: Shifting cultivation, humid tropics, soil degradation, traditional farming, alley cropping Introduction to the series Most uplands of the humid and sub-humid regions of Sub-saharan Africa comprise Alfisols, Ultisols, Oxisols and some Inceptisols. These soils have low nutrient and water reserves available to plants and are of low inherent fertility. Alfisols are relatively more fertile than Ultisols and Oxisols, but they have poorer soil physical properties. Alfisols have a coarse-textured surface horizon overlying a clayey subsurface layer. These soils have a weak structure and are highly susceptible to crusting, compaction and accelerated soil erosion [Lal, 1976; Lal, 1985]. In addition to being susceptible to erosion, these soils are also prone to mid-season drought stress. Most uplands have traditionally been used for extensive subsistence systems requiring long forest fallow for fertility restoration and for erosion control [Nye and Greenland, 1962]. Traditional systems are based on low inputs, are complex and diverse, and have built-in good security and stabil- ity. Bush fallowing,
Agroforestry Systems – Springer Journals
Published: Jun 24, 2004
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