Abstract
Throughout the 1980–1983 growing seasons, ’Summerland Red McIntosh’ apple (Malus domestica Borkh.) on M.26 rootstock growing outdoors in large buried pots with a range of N nutrition were irrigated daily or twice weekly with the same quantity of water (equivalent to 5.9 mm∙day−1) Irrigation frequency affected leaf nutrient concentration; leaf Mn and Zn increased in 3 of 4 yr, leaf Ca and Mg in 2 yr and leaf N in 1 yr at the daily irrigation frequency.Key words: Irrigation frequency, McIntosh apple trees, leaf N, leaf Ca, leaf Mg, leaf Zn, leaf Mn
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