Abstract
A 2-yr study showed that the bioelectric method was sensitive and reliable to test winter hardiness of roots of container-grown plants and to determine the effects of seasonal changes on their cold-hardening. This provides possibilities for overcoming the difficulties of studying simultaneously the factors affecting winter hardiness of roots in close association with shoots of overwintering plants. The findings may be of special importance to the production of container-grown nursery stock plants because, due to the restricted root systems, their winter survival is closely related to the frost hardiness of their roots. The differences in the hardening capacity of roots and shoots were quantitatively expressed as ratios of impedance. An impedance reading of about 85,000 ohms for roots, with a shoot/root ratio of 2.0:1.0, and a temperature of soil and air of 1.7 and −3.9 C, respectively, were found to be an optimum condition for overwintering of container stock. The correlations between the impedance measurements and the temperature of soil and air were used as guides for determining viable conditions for overwintering plants.
Publisher
Canadian Science Publishing
Subject
Horticulture,Plant Science,Agronomy and Crop Science
Cited by
6 articles.
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