Fertilizing in both early fast growing period and autumn can not only enhance seedling growth but also increase cold resistance.
既有速生前期施肥又有秋季施肥的处理，不仅提高了苗木的生长量，而且增强了苗木的抗寒性。
It is the fast growth period that the number and the formation of the elder in China in the 21st century. The proportion of the elder in the total population will increase gradually.
21世纪，是我国老年人口数量及人口老龄化的快速增长时期，老年人口在社会总人口中的比重将逐渐增大。
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