کلمات کلیدی مربوط به کتاب ارزیابی تعادل مواد مغذی خاک. رویکردها و روشها: کشاورزی، شیمی کشاورزی و علوم خاک
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توجه داشته باشید کتاب ارزیابی تعادل مواد مغذی خاک. رویکردها و روشها نسخه زبان اصلی می باشد و کتاب ترجمه شده به فارسی نمی باشد. وبسایت اینترنشنال لایبرری ارائه دهنده کتاب های زبان اصلی می باشد و هیچ گونه کتاب ترجمه شده یا نوشته شده به فارسی را ارائه نمی دهد.
Rome: FAO, 2003. — 88 pp. — (FAO Fertilizer and Plant Nutrition
Bulletin 14).
ISBN 92-5-105038-4.
Nutrient-balance assessments are
valuable tools for delineating the consequences of farming on
soil fertility. Various approaches and methods for different
situations have been used. This bulletin presents a
state-of-the-art overview of nutrient-balance studies. It
brings out the evolution of the approaches and methods,
provides for comparisons among them, features the improvements
made and highlights remaining issues. This analysis will be
useful in further development of the assessment methodologies
as reliable tools for devising time-scale soil fertility
management interventions.
C o n t e n t s.
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.
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.
General Discussion.
Uncertainties.
Sampling.
Available nutrients.
Spatial data.
Upscaling.
Impact.
Conclusions and Caveats.
Macrolevel.
Mesolevel.
Microlevel.
Caveats.
Validation.
Gaps.
Usefulness for policy-makers.
Presentation of outcomes.
Specific problems for each scale level. 82
References.