Interrelation of Scion and Rootstock in Fruit-trees

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Abstract
Three apple rootstock varieties, M. IX, M. IV, and M. XII, were combined as scion and rootstock in all nine ways and samples were harvested at intervals over 3 years. Their relative sizes on each occasion and their relative rates of growth between occasions were determined by calculating the ratios between the geometric mean weights. The ratio of the products of these for trees with reciprocal Unlike unions, e.g. IX/XII× XII/IX, to that for trees with Like unions of the component varieties, e.g. IX/IX × XII/XII, was slightly but not significantly less than unity. Composite trees, e.g. IX/XII, resembled in size those of the rootstock type, e.g. XII, more than the scion variety, IX, though this had some influence.

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