攀西地区春烟生育规律研究

在相似的施肥和管理水平下，攀西春烟前期的植株高度矮于夏烟，单株叶片数较夏烟有所减少；春烟前期植株干物质积累慢于夏烟，中期干物质迅速积累，其积累速度快于夏烟，最终积累的干物质量有所增加；春烟不同部位叶片与夏烟对应部位叶片，在叶面积增长速度和时间上表现出明显的差异，春烟群体叶面积高峰期较夏烟滞后20天左右，生育期有所延后。

A Study on Development Pattern of Tobacco Plants in Panxi District

Under similar fertilization and management conditions, plants of spring tobacco are shorter than that of summer tobacco and also have fewer leaves. While the dry matter accumulated more slowly in spring plants than in summer plants during the early period of growing,it did quicker during following periods. As a result,spring plants accumulated more dry matter than summer plants. The rate of leaf area enlargement also varied with seasons,with a lag period of about twenty days for the appearance of maximum group leaf area for spring plant. Thus the development of plants also delayed.