FAO FERTILIZER AND PLANT NUTRITION BULLETIN 15 Scaling soil nutrient balances |
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FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 2004 |
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Cover photographs:
Hedgerow intercropping, Ghana. FAO/18309/P. Cenini.
Coffee
field, Kenya. E. Smaling.
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ISBN 92-5-105237-9
ISSN 0259-2495
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© FAO 2004
Chapter 2. Study area descriptions
Country and study area selection
Ghana
Calculation of soil nutrient stocks
Macrolevel
Ghana
Kenya
Mali
MesolevelCocoa-based farming system in Ghana
Tea - coffee - dairy - based farming system in Kenya
Cotton-based farming system in Mali
A comparison of macrolevel methodologies: 1990 and 2003
Comparing macro - meso and micro - meso levels
Comparing the mesolevel between countries
Data problemsLand-use map
Erosion modelling
Nutrient-balance calculationsValidation
Gaps
Specific problems for each scale level
Presentation of outcomes
Usefulness for policy-makers
Annex 1. Nutrient content values of manure from literature
Annex 2. Reference values for K-leaching regression model
Annex 3. Rooting depth
Annex 4. Reference values for gaseous losses
Annex 5. A procedure for LAPSUS modelling
Annex 6. Soil properties - FAO74 classification
Annex 7. Data used for macrolevel nutrient balances in a 2003 FAO study on Ghana, Kenya and Mali
Annex 8. Results of the macrolevel nutrient-balance calculations from a 2003 FAO study of Ghana, Kenya and Mali
Annex 9. Data used for mesolevel nutrient balances from a 2003 FAO study of Ghana, Kenya and Mali
Annex 10. Results of the mesolevel nutrient balance calculations from a 2003 FAO study of Ghana, Kenya and Mali
Annex 11. Abstracts of presentations from a 2003 workshop in Nairobi on scaling soil nutrient balances