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Study on the Hardiness of Apple Cultivars

Gao Ainong, Jiang Shurong, Zhao Xiwen, Deng Jiguang, Sha Shoufeng, Liu Zhi, and Zhang Min (Liaoning Institute of Pomology, Xiongyue 115214; Department of Horticulture, Shenyang Agricultural University)  
Hardiness is one of the important characters of apple trees. The methods of electrical conductivity, recovering growth, tissue browning and Logistic equation were taken in this trial. It was suggusted that 40% of electrolyte osmatic ratio was the standard of critical lethal temperature to apple cultivars determined. Fifty-one apple cultivars were divided into five grades according to their hardiness to the low temperature.
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