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FAO FERTILIZER AND PLANT NUTRITION BULLETIN 14
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Assessment of soil nutrient balance
Approaches and Methodologies
by
R.N. Roy
FAO Land and Water Development Division
Rome
R.V. Misra
FAO Consultant
J.P. Lesschen
Wageningen University
The Netherlands
E.M. Smaling
Wagemngen University
The Netherlands
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FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 2003
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Table of Contents
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COVER GRAPHIC
National soil surface nitrogen balances -
explanatory notes.
OECD Secretariat, Paris. 2001.
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The designations employed and the presentation of material in
this information product do not imply the expression of any opinion whatsoever
on the part of the Food and Agriculture Organization of the United Nations
concerning the legal or development status of any country, territory, city or
area or of its authorities, or concerning the delimitation of its frontiers or
boundaries. |
ISBN 92-5-105038-4
ISSN 0532-0488
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© FAO 2003
Contents
Preface
Acknowlegements
Executive summary
Acronyms
1. Introduction
Spatial and temporal
context
System flows and
estimations
Assumptions - their validity and
reliability margins
Upscaling and its
validity
Socio-economic factors and their role
in nutrient balances
2. Methodologies for assessing soil
nutrient balances
Macrolevel
Sub-Saharan Africa soil
nutrient-balance study, FAO, 1983-2000
Nutrient-balance studies in Africa,
IFDC approach
National soil surface nitrogen
balances, OECD
Soil nutrient audits for
China
Sub-Saharan Africa soil
nutrient-balance study, FAO, 2003
Mesolevel
Soil nutrient-balance study Kisii District,
Kenya
Soil nutrient-balance study, southern Mali
Nutrient-balance studies in India
Sub-Saharan Africa soil nutrient-balance study,
FAO, 2003
Microlevel
NUTMON - nutrient monitoring for tropical farming
systems
Participatory nutrient management in southern
Mali
Nutrient balances for niche management
3. General discussion
Uncertainties
Sampling
Available nutrients
Spatial data
Upscaling
Impact
4. Conclusions and caveats
Macrolevel
Mesolevel
Microlevel
Caveats
Validation
Gaps
Usefulness for
policy-makers
Presentation of outcomes
Specific problems for each scale
level
References
FAO Technical papers
Back cover
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