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M&s, apple rootstocks, leaf mineral content, components of variance. SUMMARYThe relative effects of year to year variation and rootstock genotypes on the major content of leaves of four apple scion cultivars were studied. For nitrogen and phosphorus the main source of variation was due to years. For potassium, magnesium and calcium there were significant genetic effects. The results are discussed in relation to breeding for improved efficiency in mineral uptake in apple rootstocks. Particular reference is made to uptake of minerals associated with physiological disorders of stored apples.

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