Data/hora: 16/06/2024 00:53:14

Provedor de dados: | 21
País: | Germany
Título: | Concentrations of soil potassium after long-term organic dairy production
Autores: | Løes, Anne-Kristin; Øgaard, Anne Falk.
Data: | 2003
Ano: | 2003
Palavras-chave: | Nutrient turnover Farm nutrient management Recycling; Balancing and resource management.
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 &gt;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 (&lt;65). The soils were mostly light-textured, and reserves of K-releasing soil minerals (illite) were low, never exceeding 6% of the mineral particles &lt;2 mm diameter. Topsoil acid-soluble K concentrations were low (&lt;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.
Tipo: | Journal paper
Idioma: | Inglês

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.

Editor: | Channel View Publications
Relação: | http://orgprints.org/5244/
Formato: | application/pdf