Nutrient Cycling in Agroecosystems

, Volume 47, Issue 1, pp 41–48 | Cite as

The potential of crushed rocks and mine tailings as slow-releasing K fertilizers assessed by intensive cropping with Italian ryegrass in different soil types

  • Anne Kjersti Bakken
  • Håvard Gautneb
  • Kristen Myhr


In search for a source for a slow-releasing K fertilizer, the plant availability of mineral K in selected crushed rocks and mine tailings was investigated by growing Italian ryegrass for six months in small volumes of peat, loamy sand or silt loam mixed with different K-sources. The K supplied as K-feldspar was nearly unavailable to the plants, whereas nearly 60% of the K supplied as biotite and nepheline in a carbonatite, was nearly unavailable to the plants, parts. The carbonate content of the rocks and tailings seemed to be more important for the availability of the K than the specific surface of the mineral particles. It is concluded that a rock-based fertilizer containing biotite as its main K-bearing mineral and between 5 and 20% carbonate, will release K at a slower rate than soluble K fertilizers do and still supply considerably more K to the plants than is supplied from the fraction of non-exchangeable K in the soil.

Key words

biotite K-feldspar loamy sand nepheline plant available potassium silt loam 


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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Anne Kjersti Bakken
    • 1
  • Håvard Gautneb
    • 2
  • Kristen Myhr
    • 1
  1. 1.The Norwegian Crop Research InstituteKvithamar Research CentreStjørdalNorway
  2. 2.Geological Survey of NorwayTrondheimNorway

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