By P. A. Sanchez (auth.), Fergus L. Sinclair (eds.)

Agroforestry learn is imperative to constructing equipment for the sustainable use of common renewable assets, evolving to deal with the wishes of the arrival century. it's now essential to consolidate the medical earnings now being made in process-oriented learn and to improve a coverage framework to inspire the adoption of sustainable land use practices. Agroforestry performs an incredible position in keeping wooded area assets, lowering the necessity for deforestation. additional, if `forest' is largely outlined as tree disguise, agroforestry also will bring up the share of woody biomass in farming landscapes.
The papers chosen for inclusion in Agroforestry: technological know-how, Policy,and Practice determine agroforestry as an interdisciplinary technological know-how curious about the sensible principal of helping farmers, woodland dwellers and landscape-level planners to accomplish sustainable meals, gas and trees creation into the twenty first century.

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Extra info for Agroforestry: Science, Policy and Practice: Selected papers from the agroforestry sessions of the IUFRO 20th World Congress, Tampere, Finland, 6–12 August 1995

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4 kg P ha- ' a-I. Although the results are far from ideal, they suggest that agroforestry systems can improve nutrient balance. One way to balance nutrient budgets is with fertilizer applications in agroforestry systems. Fertilizer response has been most commonly reported in alley-cropping systems and perennial shade systems [Szott and Kass, 1993]. Nutrient balances in alley cropping are usually negative, particularly with 40 Table 5. Annual soil Nand P budgets for the field compartment in an existing farm system and an improved agroforestry system in Western Kenya.

It is hoped that as confidence increases with time, new, scientifically solid results will become the norm rather than the exception in agroforestry research. Acknowledgements Many colleagues have reviewed drafts of this paper and provided helpful suggestions. The author would like to acknowledge their help and thank the following who made particularly insightful or extremely thorough comments: Edmundo Barrios, Roland Buresh, Hubert de Foresta, Steve Franzel, Sam Fujisaka, Dennis Garrity, Anne-Marie Izac, Bert Janssen, Roger Leakey, Susan Minae, Chin Ong, Cheryl Palm, Frank Place, Keith Shepherd, Fergus Sinclair, Paul Smithson, Thomas Tomich and Meine Van Noordwijk.

1992]. Nitrogen-fixing trees may have been oversold in comparison with nonfixing trees, particularly those of the Caesalpiniaceae family [Garrity and Mercado, 1994]. , 1991; Garrity and Mercado, 1994]. Can agroforestry, through BNF and deep nutrient capture, eliminate the need for application of nitrogen fertilizers to crops? The answer depends largely on crop yield-level expectation. A typical maize crop in smallholder African farms yields 1 t ha- I of grain and requires a plant accumulation of about 40 kg N ha- I .

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