Direct assessment of symbiotically fixed nitrogen in the rhizosphere of alfalfa

  title={Direct assessment of symbiotically fixed nitrogen in the rhizosphere of alfalfa},
  author={Michael P. Russelle and Deborah L. Allan and Cameron J. P. Gourley},
  journal={Plant and Soil},
Rhizodeposition has been proposed as one mechanism for the accumulation of significant amounts of N in soil during legume growth. The objective of this experiment was to directly quantify losses of symbiotically fixed N from living alfalfa (Medicago sativa L.) roots to the rhizosphere. We used 15N-labeled N2 gas to tag recently fixed N in three alfalfa lines [cv. Saranac, Ineffective Saranac (an ineffectively nodulated line), and an unnamed line in early stages of selection for apparent N… CONTINUE READING
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