Nutrient Cycling in Agroecosystems

, Volume 56, Issue 1, pp 53–57 | Cite as

Crushed rocks and mine tailings applied as K fertilizers on grassland

  • A.K. Bakken
  • H. Gautneb
  • T. Sveistrup
  • K. Myhr


Crushed rocks and mine tailings containing biotite, K-feldspar and nepheline as K-bearing minerals were applied as K fertilizers in a series of 15 grassland field trials. A treatment with KCl as K-source outyielded treatments with rock based fertilizers in the first and the second experimental year. In the third and last year of the study when no K fertilizers were supplied, previously added carbonatite and biotite concentrate supported grass growth as much as previously added KCl did. Although it is concluded that a substantial part of the K bound in biotite and/or nepheline in crushed carbonatites, biotite concentrate and epidote schists is plant available, these rock/mineral products weathered too slowly to replenish the native pool of plant available K within a three year period with five harvests. The K bound in K-feldspar seemed to be nearly unavailable for the grass plants.

biotite Festuca pratensis K-feldspar Phleum pratense plant available K potassium 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • A.K. Bakken
    • 1
  • H. Gautneb
    • 2
  • T. Sveistrup
    • 3
  • K. Myhr
    • 1
  1. 1.Kvithamar Research CentreThe Norwegian Crop Research InstituteStjørdalNorway
  2. 2.Geological Survey of NorwayTrondheimNorway
  3. 3.Holt Research CentreThe Norwegian Crop Research InstituteTromsøNorway

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