This book provides a review of both economic and biophysical aspects of soil use and research in agroforestry, with an emphasis on nutrient-poor forest and savanna soils. It combinesoverviews of research results and a review of methods used in research, covering topics such as the economics of soil fertility management, nutrients and organic matter, soil structures, and soil biological processes. Schroth isaffiliated with the National Institute for Research in the Amazon, Brazil. Sinclair is affiliated with the University of Wales, UK. The book is distributed by Oxford University Press.