Journal
NUTRIENT CYCLING IN AGROECOSYSTEMS
Volume 56, Issue 1, Pages 53-57Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1009709914578
Keywords
biotite; Festuca pratensis; K-feldspar; Phleum pratense; plant available K; potassium
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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.
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