Eine Kombination der Thermogravimetrie mit der 15N-Tracertechnik zur Untersuchung von Huminsäurepräparaten

A combination of thermal analyses and ¹⁵N tracer technique for investigation of humic acids Differences in humic acids of two extreme variants of three long-term trials due to a three years intensive fertilization in a pot experiment are also to be found by means of thermogravimetry. Additionally the ¹⁵N contents of humic acids were investigated at certain temperatures according to the peaks given by thermogravimetric study. The ¹⁵N isotope is also incorporated in higher molecular compounds. The ¹⁵N content varies due to differences in humus content and composition of the soils used.