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The requisite conditions for winter hardiness.


, : The requisite conditions for winter hardiness.. Sadovodstvo. 11, 30 p

The frost resistance of the root systems of own-rooted 22-year-old apple trees of a number of varieties was estimated by exposing the roots to temperatures of -12 degrees , -14 degrees and -16 degrees C. and observing the damage caused under a microscope. The variety Kitajka Volzskaja was the most frost resistant and Pepin Safrannyj the most sensitive. A certain amount of variation in resistance was found within varieties.

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