Effect of nursery culture and bud status on freeze injury to
نویسنده
چکیده
SYNOPSIS The effects of nursery practices on freeze tolerance of P taeda and P elliottii seedlings were examined by placing the seedlings in a freezing chamber and lowering the temperature to -10C. Injury was evaluated 10 days after the freeze treatment by examining cambial tissue (browning test). Top-pruning P taeda seedlings (three times) increased freeze tolerance while rootwrenching (six times) had no effect. Cambial injury of P elliottii was negatively related to seedling diameter but injury was not affected by either top-pruning or root-wrenching. Although potassium fertilizer is often recommended for fall fertilization in the southern United States, this study found no beneficial effects on freeze tolerance. In fact, fertilization in October decreased freeze tolerance of P elliottii. Data from the freeze test and from natural freezes in the nursery were analyzed to determine if freeze tolerance was related to the presence of a well-formed terminal bud in early November. Covariance analysis from the freeze test indicated no relationship between freeze tolerance and bud presence for either species. Survey data indicate that P taeda seedlings with well-formed terminal buds were not more tolerant of freezing in November than seedlings without terminal buds.
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