Fig. 7
Excess tracer concentrations (dTC) of 15N, Li, Cs, Se and Rb from alfalfa shoot biomass affected by core-labelling depth (1.0, 2.5, 4.2 m; a–e) and sampling time (Week 4 and 8; f–j) in the autumn experiment. Roman letters indicate significant differences between the treatments (HSD Tukey; P ≤ 0.05). Means and one SE are shown