Studies in the Nutrition of Apple Rootstocks

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Abstract
One-year rooted shoots of M.VII apple rootstock were grown for a single season by spraying their roots continuously with nutrient solutions containing either < 3 ppmMg(Mg(0)) or 45 ppm(Mg(0)) to give, respectively, potentially very deficient or healthy plants. The new shoots of half the plants in each of these treatments were dipped periodically in a 2 per cent solution of MgSO4. 7H2O plus ‘wetter’. Mg(0) undipped plants developed severe symptoms of Mg deficiency, growth was poor, and the shoot/root dry-weight increment ratio was high; none of these characteristics was found in Mg(0) dipped plants, whose growth was not appreciably less than that of Mg(2) undipped controls. There was little translocation of Mg from leaves to roots: the concentration of Mg in roots of Mg(0) dipped plants was as low as that of the undipped. The large accumulation of Mn and, to a less extent, of Fe in Mg(0) dipped roots was not apparently detrimental to growth. Growth of Mg(2) dipped plants was similar to that of the undipped. Dipping had little effect on the chemical composition of leaves, except to raise the concentration of Mg.

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