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Acta Agriculture Scandinavica Section B-Soil & Plant Science
Year: 2010  |  Volume: 60  |  Issue: 6  |  Page No.: 569 - 572

Low manganese (Mn) and copper (Cu) concentrations in cereals explained yield losses after lime application to soil

Holger Kirchmann and Johannes Eskilsson    

Abstract: A range of locally available liming materials of different geological origin, particle size, and application rate were investigated in 15 field sites over a period of 8 years. At 5 sites, lime addition to soils caused average yield losses of 7%. Concentrations of Mn and Cu but not of boron and zinc in grains declined in limed plots. Decline in concentrations of Mn and Cu were significantly correlated with increasing soil pH-values. Crop data indicated that concentrations of Mn and Cu in grains reached low, critical levels. Yields declined at threshold values amounting to 15 mg Mn kg-1 for wheat and barley, 25 mg Mn kg-1 for rye, 30 mg Mn kg-1 for oat, and 3 mg Cu kg-1 for the four cereals.

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