Abstract
SUMMARY Environmental factors and practical afforestation techniques are not the major constraints to tree planting in arid and semi-arid lands (ASAL). More important are social features (including land use and tenure, community organization) and economic constraints (such as the lack of a monetarized economy, poor transport and marketing systems, and poor understanding of long-term cost-benefit appraisal). There is a great need to devise incentives and encourage participation in tree planting schemes by local populations and, hence, for professional and nonprofessional training in extension techniques for arid zones.
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