The relationship between leaf size and shoot length in apple

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Abstract
Summary Part of the orchard canopy is made up of leaves on long (‘extension’) shoots, and the size and number of those leaves are related to the vigour of the shoots bearing them. On very vigorously growing shoots on small hard-pruned trees of the apple rootstock Crab C, average leaf size was linearly related to shoot length. On orchard trees of cv Cox’s Orange Pippin with minimal or spur pruning on the semi-dwarfing rootstock M.26 and the invigorating rootstock MM. 104, the relationship between average leaf size and shoot length was weaker on minimally pruned than on spur-pruned trees, and on trees on M.26 than on MM.104.

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