The following references were found for Hardarson, G.

• Nitrogen Fixation in Fababeans as Affected by Plant Population Density in Sole or Intercropped Systems with Barley, 1987
• Nitrogen fixation and translocation in field-grown fababean., 1987
• Measurements of nitrogen fixation in fababean at different N fertilizer rates using the 15N isotope dilution and 'a-value' methods., 1991b
• Is nitrogen transferred between field crops?, 1993
• Nitrogen accumulation in sole and mixed stands of sweet-blue lupin (Lupinus angustifolius L.), ryegrass and oats, 1992

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