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  1. 关键资源 1989-01-02 [see also 631.491 YOU - volume updated, and with title change] This book is a review of the potential of agroforestry for soil conservation, treated in its wider sense to include both control of erosion and maintenance of fertility. The objectives are: To summarize the present state of knowledge...
  2. 关键资源 1988-01-19 Agroforestry in Dryland Africa is specifically designed to be used by agroforestry field workers in subhumid and semi-arid regions of the continent. This includes researchers working with grassroots organizations, community extension and development workers and development specialists in...
  3. 关键资源 1998-12-28 A tool for developing and applying the science of agroforestry to problems of natural resources conservation and sustainable agricultural development, this book examines the environmental and social conditions that affect the roles and performance of trees in field- and forest-based agricultural...
  4. 关键资源 2001-10-01 This booklet assembles under one cover the 97 factsheets and highlights published by the Forest, Farm and Community Tree Network (FACT Net) and its predecessor the Nitrogen Fixing Tree Association (NFTA) between 1985 and 1999. These 2 to 4 page bulletins are concise summaries of important...
  5. 关键资源 1989-01-15 An urgent challenge facing agricultural scientists working on upland food-crop production in many parts of the humid and subhumid tropics is the need to find viable, sustainable, and environmentally sound alternatives to the ancient shifting cultivation and bush-fallow, slash-and-bum cultivation...
  6. 关键资源 1993-01-19 Agroforestry has come of age during the past fifteen years. During this period, activities and interest in agroforestry education and training have increased tremendously, as in other aspects of agroforestry development. Today, agroforestry is taught at the senior undergraduate and postgraduate...
  7. 关键资源 2005-08-30 Volume One: Vision & Theory Edible Forest Gardens is a groundbreaking two-volume work that spells out and explores the key concepts of forest ecology and applies them to the needs of natural gardeners in temperate climates. Volume I lays out the vision of the forest garden and explains the...
  8. 关键资源 2005-10-20 Volume Two: Design & Practice Edible Forest Gardens is a groundbreaking two-volume work that spells out and explores the key concepts of forest ecology and applies them to the needs of natural gardeners in temperate climates. Volume I lays out the vision of the forest garden and explains the...
  9. 关键资源 1997-12-15 Slash/mulch systems, ancient agricultural practices still widely used today, are often overlooked by farmers or mistaken for slash-and-burn systems; however, slash/mulch systems, in which vegetation is cut and mulched on site rather than being discarded or burned, are far more beneficial than are...
  10. 关键资源 1998-01-02 The purpose of this volume is to present a detailed and in-depth look at the concepts, principles and practices that underlie agroforestry application. The focus is on how the individual parts (the theories and concepts) form the whole (the process of designing or understanding user-specific...
  11. 关键资源
    1993-01-01 Part I deals with the relationship between trees and people, and the threat to trees posed by social, economic and political factors. Part II focuses on multistorey farming, an economically sound cropping method used in many tropical regions. The annexes provide useful tables on food and fodder...
  12. 关键资源 1929-01-19 Beside me was a tree, one lone tree. That tree was locally famous because it was the only tree anywhere in that vicinity; yet its presence proved that once there had been a forest over most of that land-now treeless and waste. The farmers of a past generation had cleared the forest. They had...
  13. 关键资源 2007-05-25 This handbook of locally based agricultural practices brings together the best of science and farmer experimentation, vividly illustrating the enormous diversity of shifting cultivation systems as well as the power of human ingenuity. Environmentalists have tended to disparage shifting...