Abstract
We have evaluated in this study the distribution of 15N of ammonium sulfate in the humified compounds of a typic hapludalf. After 1 month of evolution under controlled conditions with and without plant, the average of 15N amounts distributed in the following order : humins (51%), alkali-soluble fractions (29%), fractions extracted by ultra-sound (19%). The amount of 15N was important in the fulvic acids. The rhizospheric effect induced by the presence of plant led to an increase of 15N in the humin fraction < 2 μm. These results allowed us to outline the mechanisms of transfer of 15N in different fractions of organic matter.
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