Phosphorus acquisition by citrate- and phytase-exuding Nicotiana tabacum plant mixtures depends on soil phosphorus availability and root intermingling

Courtney D. Giles^*, Alan E. Richardson, Barbara J. Cade-Menun, Malika M. Mezeli, Lawrie K. Brown, Daniel Menezes-Blackburn, Tegan Darch, Martin S.A. Blackwell, Charles A. Shand, Marc I. Stutter, Renate Wendler, Patricia Cooper, David G. Lumsdon, Catherine Wearing, Hao Zhang, Philip M. Haygarth, Timothy S. George