Summary
The EUF-N and EUF-K contents of deep grey-brown luvisols under fallow were investigated over a period of 18 months.
EUF-NO3-N increased continuously during the spring and summer of 1983, reaching their peak in September/October. They declined in the winter of 1984, and increased again during the spring and summer of the same year.
During the spring and winter EUF-Norg was higher than EUF-NO3-N. A decline in EUF-Norg due to mineralization was associated with an increase of EUF-NO3-N. EUF-Norg increased due to mobilization of soil N in April/May. EUF-Norg also increased in autumn 1983 as a consequence the incorporation of mineral nitrogen into this fraction. When mineral N was incorporated EUF-NO3-N declined.
EUF-Norg in the subsoil was lower than in the topsoil. EUF-NO3-N in the subsoil decreased as EUF-Norg increased. It may therefore be assumed that the higher the content of EUF-Norg in the subsoil the more mineral nitrogen will be immobilized.
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Németh, K., Fürstenfeld, F. Changes of EUF-N and EUF-K fractions in three deep grey-brown luvisols during 18 months under fallow. Plant Soil 86, 249–256 (1985). https://doi.org/10.1007/BF02182900
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DOI: https://doi.org/10.1007/BF02182900