Abstract
Water introduced into bore holes in trunks of Quercus alba L. trees over 6-hour daylight periods at different times of the year was taken up as rapidly by trees without leaves as by trees with leaves. In spring, with ample soil moisture, there seemed to be some relationship between volume of water intake and air temperatures during injection. In autumn, water intake appeared mainly unrelated to maximum daily temperature. There was indication of an increase in water intake as the autumn progressed, although soil moisture may have influenced results. Differences among groups of trees regarding volume of intake in spring and autumn were evident, although there were only slight or insignificant differences in site among these groups.
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