In order to explore the possibility of extend of Hokkaido Apple Clone-9(HAC-9) trees in North Hebei Mountain area, the extending experiments were carried out from 1995 to 1997.
为探讨北海道9号苹果在冀北山地推广的可能性，于1995～1997年进行了引种观察，积累了试验数据。
In order to explore the possibility of extend of Hokkaido Apple Clone-9(HAC-9) trees in North Hebei Mountain area, the extending experiments were carried out from 1995 to 1997.
为探讨北海道9号苹果在冀北山地推广的可能性，于1995～1997年进行了引种观察，积累了试验数据。
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