SUMMARY

The stady of magnesium content in different organs of an apple (root, trunk, leaf and fruit) in different exuberance (types Idared and Golden Delicious on bases M 9, M 26 and MM 106) shows the following tendencies, respectively the interactive effects:

• The magnesium content in a leaf in the interactive relationship type/base (regardless of the year) with the increase of the exuberance of base shows a tendency of increase for type Idared b = + 0.002, while the Golden Delicious shows a tendency of decrease b = - 0.063.
• The magnesium content in the examined organs with the ehuberance increase of the base (regardless of the cultivar) shows a tendency increase in leaves b = + 0.091, in tree b = + 0.017, and a tendency of decrease in root b = - 0.016 and in fruits b = - 0.007.

          Key words: Apple, Cultivar, Rootstock, Correlation cultivar/rootstock, magnesium, root, tree, leaf, fruit.