Yichun Branch of Heilongjiang Academy of Forestry Sciences Yichun 153000 China;
Yichun Branch of Heilongjiang Academy of Forestry Sciences Yichun 153000 China;
Yichun Branch of Heilongjiang Academy of Forestry Sciences Yichun 153000 China;
Propagation materials; Cultivation years; Polygonatum odoratum; Yield; Effects;