Seasonal Changes in the Diameter of Secondarily Thickened Roots of Fruit Trees in Relation to Growth of Other Parts of the Tree

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Abstract
The diameters of apple and cherry tree roots, between 1·5 ft. and 6·0 ft. from the base of the tree trunk, were measured with a microscope through glass observation panels at intervals during 4 years. The rate of root thickening was low in June and was most rapid from mid-July to mid-September, whereas rapid trunk thickening occurred in June and continued until September. The period of maximum root thickening coincided with a second peak in the production of new white extension roots when the intensity of shoot growth was decreasing. Some root thickening was detected one week after bud burst but many roots showed no thickening until July or August. At this distance from the trunk there was no progression of thickening along the root from the proximal to the distal end.

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