Abstract
Abstract Seedlings of European birch (Betula pendula Roth.) grew rapidly (3.4 cm/week) in long days (8 hours of natural light plus 2 hours of supplemental light in the middle of the dark period). Two weeks of short days (8 hours of natural light) inhibited shoot growth and promoted the onset of dormancy. Daylength did not effect the rate of root growth. Root pruning suppressed the rate of root growth for 2 weeks, but once active tips were formed the rate of growth was similar to unpruned roots. Complete defoliation or covering of the foliage on short day dormant plants terminated root growth.
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