FAO FERTILIZER AND PLANT NUTRITION BULLETIN 14

FAO FERTILIZER AND PLANT NUTRITION BULLETIN 14

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

FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 2003
 

Table of Contents


COVER GRAPHIC

National soil surface nitrogen balances - explanatory notes.
OECD Secretariat, Paris. 2001.

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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