Abstract: The supply of nitrogen (N) from legumes is a key in maintaining soil N fertility in plant production with low fertilizer N inputs. Leaf-feeding of isotope tracers is a commonly used methodology to study the flow of carbon (C) and N from legumes into soil and companion plants. Here we investigated the temporal fate of 15 N and 14 C fed as a single-pulse via leaves to red and white clover in pure stands and in mixtures with grass in order to investigate the suitability of leaf-labeling for estimation of rhizodeposition and N transfer. The 15 N wa...
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