ISHS Acta Horticulturae 168: II Symposium on Winter Hardiness in Woody Perennials
WINTERHARDINESS OF SALIX PLANTS |
| Author: | H.A. von Fricks |
| Abstract:
Dormant one-year-old shoots of different Salix species and clones were collected from December 1982 to March 1983, and subjected to an artificial hardening regime. From this plant material, minicuttings were prepared and frozen to -74°C and -85°C, in order to determine the winterhardiness of the distal shoot parts. Most tested species and clones showed that their winterhardened shoots withstand temperatures of -85°C. Two exceptions to the rule were the species Salix Schwerini and Salix fragilis which showed decreased survival. During the fall, winter and spring (1983)84), an outdoors study was made with potted plants of the species Salix aquatica, which had been fertilized with different amounts of a balanced nutrient solution, to achieve plants with low and high nitrogen contents respectively. Independently of N-status, plants were frost damaged at -10°C to the middle of October, but showed no damages at -4°C. The frost hardiness increased during November, and in December and January plants survived -81°C. In March, plants still withstand temperatures of -55°C. Plants with high N - content showed better vigour during the fall, and started (axillary bud flushing sooner) after the freezing tests than plants with low N-content. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
