The ⁸⁷Sr/⁸⁶Sr ratio of a produce is generally linked with the soil geological features of the growing areas. This study aimed at assessing to which extent the addition of external Sr by agricultural practices, like irrigation and mineral nutrient supply, influences this relationship. In a first experiment, oat plants in two soils reflected the ⁸⁷Sr/⁸⁶Sr of the soil. However, this link was significantly altered at increasing levels of external Sr soil supplies. In a second experiment, apple trees transplanted in pots modified their original ⁸⁷Sr/⁸⁶Sr, which became progressively closer to the soil Sr isotope ratio. The addition of tap water and fertilizers, with different Sr isotopic signatures, slightly affected plant ⁸⁷Sr/⁸⁶Sr. Results confirm the potential of the ⁸⁷Sr/⁸⁶Sr ratio as a geographical tracer of agricultural commodities, but whenever the range of ⁸⁷Sr/⁸⁶Sr variability among soils from different geographical areas is narrow, the influence of external Sr-sources may smooth over these diversities.

中文翻译：

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土壤和外部Sr输入的Sr同位素比对植物Sr同位素比的影响

农产品的⁸⁷ Sr / ⁸⁶ Sr之比通常与生长区域的土壤地质特征有关。这项研究旨在评估农业实践（如灌溉和矿质养分供应）对外部Sr的添加影响程度。在第一实验中，在两种土壤燕麦植物反射的⁸⁷ SR / ⁸⁶的土壤的锶。但是，随着外部Sr土壤供应量的增加，这种联系发生了显着变化。在第二个实验中，移植到盆中的苹果树修改了其原始的⁸⁷ Sr / ⁸⁶Sr逐渐接近土壤Sr同位素比。添加具有不同Sr同位素特征的自来水和化肥对植物⁸⁷ Sr / ⁸⁶ Sr的影响略有影响。结果证实了⁸⁷ Sr / ⁸⁶ Sr比率作为农业商品地理示踪剂的潜力，但是只要在⁸⁷ Sr的范围内/ ⁸⁶来自不同地理区域的土壤中Sr的变异性较窄，外部Sr来源的影响可能会使这些多样性趋于平滑。