Fig. 8

Tracer concentration of ¹⁵N, Li, Cs, Se and Rb in alfalfa shoot biomass affected by sampling part (young and old leaves) collected 4 weeks after the core-labelling in spring (a–e) and autumn experiment (f–j). Roman letters indicate significant differences between the sampling part (HSD Tukey; P ≤ 0.05), respectively. Statistical analysis was done with log-transformed variables. Means and one SE are shown