Effect of Low Nitrate Supply on Nitrogen Fixation in Alfalfa Root Nodules Induced by Rhizobium meliloti Strains with Varied Nitrate Reductase Activity

1. Arrese-Igor, C.
2. Estavillo, J.M.
3. Peña, J.I.
4. Gonzalez-Murua, C.
5. Aparicio-Tejo, P.M.