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A review of farm-scale nutrient budgets for organic farms as a tool for management of soil fertility
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2002 (English)In: Soil use and management, ISSN 0266-0032, E-ISSN 1475-2743, Vol. 18, no SUPPL., 264-273 p.Article in journal (Refereed)
Abstract [en]

On organic farms, where the importation of materials to build/maintain soil fertility is restricted, it is important that a balance between inputs and outputs of nutrients is achieved to ensure both short-term productivity and long-term sustainability. This paper considers different approaches to nutrient budgeting on organic farms and evaluates the sources of bias in the measurements and/or estimates of the nutrient inputs and outputs. The paper collates 88 nutrient budgets compiled at the farm scale in nine temperate countries. All the nitrogen (N) budgets showed an N surplus (average 83.2 kg N ha-1 yr-1). The efficiency of N use, defined as outputs/inputs, was highest (0.9) and lowest (0.2) in arable and beef systems respectively. The phosphorus (P) and potassium (K) budgets showed both surpluses and deficits (average 3.6 kg P ha-1 yr-1, 14.2 kg K ha-1 yr-1) with horticultural systems showing large surpluses resulting from purchased manure. The estimation of N fixation and quantities of nutrients in purchased manures may introduce significant errors in nutrient budgets. Overall, the data illustrate the diversity of management systems in place on organic farms, and suggest that used together with soil analysis, nutrient budgets are a useful tool for improving the long-term sustainability of organic systems.

Place, publisher, year, edition, pages
2002. Vol. 18, no SUPPL., 264-273 p.
National Category
Agricultural Science, Forestry and Fisheries
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URN: urn:nbn:se:ri:diva-2497DOI: 10.1079/SUM2002127Scopus ID: 2-s2.0-0036742650OAI: oai:DiVA.org:ri-2497DiVA: diva2:960087
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2017-11-21Bibliographically approved

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JTI Institutet för Jordbruks- och Miljöteknik
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Agricultural Science, Forestry and Fisheries

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CiteExportLink to record
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  • apa
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More styles
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  • de-DE
  • en-GB
  • en-US
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