Observational analysis shows improved frost resistance in seedlings with adequate potash, indicating nutrient balance is crucial.
The damage by unseasonable freezing temperatures in nurseries is often prevented by the use of mulches, bonfires, oil torches, and watering. The success of these measures depends to a great extent upon the natural vigor of seedlings and their resistance to frost. A balanced ratio of nutrients and especially an adequate supply of available potash appears to be the most important prerequisite for the production of frost-resistant stock.
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J. C. Kopitke (1941) studied this question.
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