Comparative leaf and soil investigations with special reference to potassium and magnesium. III. The occurrence of potassium and magnesium deficiency in apple trees in north-western Germany.

Gruppe, W.

Gartenbauwissenschaft 20: 3-29

1955


ISSN/ISBN: 0016-478X
Accession: 013666339

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Abstract
Symptoms of Mg deficiency occurred in trees growing in soils of <5% MgO, high K/Mg ratios and low pH. A combination of leaf and soil analyses is needed for the determination of the Mg and K requirements of apple trees.