NH<sub>4</sub> : NO<sub>3</sub> nutrition influence on biomass productivity and root respiration of poplar and willow clones.Published in:GCB Bioenergy, 2016, v. 8, n. 1, p. 51, doi. 10.1111/gcbb.12224By:Rewald, Boris;Kunze, Martin E.;Godbold, Douglas L.Publication type:Article