Kuderna

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 N_min determination

Summary

1.0 M KCI, 0.5 M K₂S0₄ and 0.0125 M CaC1₂ were compared as extractants for N_min (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: N_min, KCI, K₂S0₄ , CaCI₂ , soil organic matter.