Intra- and Intertree Variability of the Sr/Sr Ratio in Apple Orchards and Its Correlation with the Soil Sr/Sr Ratio

The Sr/Sr ratio of horticultural products mostly derives from that of the bioavailable Sr fraction of the soil where they grow and, therefore, varies according to the local geolithological features. This study investigated the intraand intertree variability of the Sr/Sr ratio in two apple orchards in South Tyrol and its relation with the soil Sr/Sr ratio. In both orchards, a moderate homogeneity of the Sr/Sr ratio was observed among subsamples of the same tree part (shoot axes, leaves, apple peels, and pulps). Moreover, the Sr/Sr ratio homogeneity among tree parts was high intratree and low intertree. The variability of the Sr/Sr ratio within the tree and within the orchard is explained in light of the Sr/Sr ratios of the soil. This Sr/Sr variability within orchards does not preclude its use as a geographical tracer; however, this aspect should be evaluated to correctly design a sampling campaign or to generalize the results.

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