省菸草研究所,通过几年来的不断观察研究,初步掌握了菸草的生长发育規律,并明确了决定菸草产量的主要时期为旺长期,卽团棵至現蕾始期。这个时期,虽然只占大田生长期的20％左右,可是每株增长的干物质量,却为总量的70％以上。旺长期每株每天叶面积平 Provincial Tobacco Research Institute, through years of continuous observation and study, initially mastered the law of growth and development of tobacco, and made it clear that the main period of tobacco production to determine the prosperous and long-term, Xuan luan to bud beginning. During this period, although only accounting for about 20% of the growth period of Daejeon, the dry matter mass per plant increased by more than 70% of the total. Wang long-term per plant leaf area per day