Abstract
Abstract Root growth and nutrient absorption by dormant plants were studied in root temperature chambers placed in growth rooms so that root and shoot temperatures could be controlled. The roots of dormant Ligustrum ibolium and Euonymus alatus ‘Compactus’ grew at root temperatures of 12.8°C, but were limited at 7.2° and 1.7°. Uptake and translocation of 32P to the dormant shoots were influenced somewhat by root temperature. However, increasing the shoot temperature from 1.7° to 7.2° resulted in a considerable increase in the movement of the isotope to the dormant shoots of both species. Field experiments indicated that nutrients applied in the fall could be absorbed by the plants, contributing to the dormant reserves which could enhance growth the following spring.
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