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The transformation of fertilizer nitrogen in the organic matter of derno-podzolic soils



The transformation of fertilizer nitrogen in the organic matter of derno-podzolic soils



Soil Organic Matter Studies Proceedings of a symposium organized by IAEA, FAO and Agrochimica Braunschweig, September 1976 Vol I: 331-337



Fulvic acids predominate over humic acids in the humus of derno-podzolic soils. Most of the N is present in the fulvic acids and humins, less in the humic acids. In lysimeter field studies with 15N-labelled nitrogen fertilizers, 24-33% of N from ammonium sulphate and urea and 18-21% of N from sodium nitrate became fixed in the soil, in all groups and fractions of the soil OM. The distribution of fertilizer N in the soil OM is identical with that of soil N.

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