Concentrations of macro- and micro-elements in the leaves of 7 strawberry ( Fragaria × ananassa Duch.) cultivars or selections (genotypes) were determined before flowering, at fruiting, and in the fall. Genotypic differences in nutrient concentration depended on sampling time, but genotype affected the levels of all 13 elements studied in leaves and the levels of Mg, S, Ca, Zn, Fe, Al, and Cu in petioles. There were effects of plant age on leaf concentrations of some elements observed in 1- and 2-year-old representatives of three genotypes.
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John et al. (1976) studied this question.