| Registro completo |
| Provedor de dados: |
Organic Eprints
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| País: |
Germany
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| Título: |
Concentrations of soil potassium after long-term organic dairy production
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| Autores: |
Løes, Anne-Kristin
Øgaard, Anne Falk
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| Data: |
2003
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| Ano: |
2003
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| Palavras-chave: |
Nutrient turnover Farm nutrient management Recycling
Balancing and resource management
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| Resumo: |
On five long-term organic dairy farms aiming at self-sufficiency with nutrients, soil concentrations of ammonium-acetate lactate extractable potassium (K-AL) and acid-soluble K was measured twice in topsoil (0-20 cm) and subsoil (20-40 cm) over periods of 6-14 years. Organic management had occurred for >9 years at the second sampling. On average there were most probably field level K-deficits. Even so, topsoil K-AL concentrations were medium high (65-155 mg K kg–1 soil), and did not decrease during the study period. However, for three farms, topsoil K-AL was approaching a minimum level determined by soil texture, where further decrease is slow. Subsoil K-AL concentrations were generally low (<65). The soils were mostly light-textured, and reserves of K-releasing soil minerals (illite) were low, never exceeding 6% of the mineral particles <2 mm diameter. Topsoil acid-soluble K concentrations were low (<300 mg K kg–1 soil) on two farms, medium (300–800) on three farms and decreased significantly on one farm. Cation-exchange capacity increased on two farms. This may indicate increased amount of expanded clay minerals caused by K-depletion. On self-sufficient organic dairy farms, purchased nutrients will be required by low soil nutrient reserves to avoid seriously decreased yields and quality of crops.
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| Tipo: |
Journal paper
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| Idioma: |
Inglês
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| Identificador: |
http://orgprints.org/5244/1/jas_010_(loesogaard).pdf
Løes, Anne-Kristin and Øgaard, Anne Falk (2003) Concentrations of soil potassium after long-term organic dairy production. International Journal of Agricultural Sustainability, 1 (1), pp. 14-29.
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| Editor: |
Channel View Publications
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| Relação: |
http://orgprints.org/5244/
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| Formato: |
application/pdf
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