Die Bodenkultur - Journal for Land Management, Food and Environment
M. KUDERNA, E. PÖTSCH and W. E. H. BLUM:
Effect of extraetants on the results of Nmin determination
1.0 M KCI, 0.5 M K2S04 and 0.0125 M CaC12 were compared as extractants for Nmin (NHt and NO;) using soil samples from arable land and grassland. No significant differences could be found for NO;-extraction, whereas significantly higher amounts of NHt were extracted with 1.0 M KCI and 0.5 M K2S04 in comparison with 0.0125 M CaC12. The relation between the amounts of extractable NHt was not constant. In the grassland samples a significant influence of the organic matter content was observed. With low organic matter contents, up to three times more NHt was extracted with 1.0 M KCl in comparison with 0.0125 M CaCl2.
Key-words: Nmin, KCI, K2S04 , CaCI2 , soil organic matter.