“南种北植”是北方地区提高麻皮纤维产量的有效措施。但由于日长生态条件的变化,致使南方型红麻品种北植后,生育期延长,当年不能就地留种,在一定程度上影响了北方麻区红麻生产的发展。几年来的生产、实验表明,运用光周期理论进行短光照制种为“南种北植”红麻就地留种闯出了一条新路。下面仅就光周期理论在红麻生产中的应用研究情况进行摘要综述,供参考。一、日长对红麻开花及营养生长的影响关于日照长度对作物开花的影响,过去国内外已有不少报导,证明了开花现象乃系昼夜长短差别对植物体所引起反应的结果。早在 “South-North planting” is an effective measure to improve the yield of hemp bark in northern China. However, due to the change of the long-term ecological conditions, the growth of kenaf varieties in southern China was prolonged after the north plantation. In the same year, the kenaf could not be planted locally, which affected the development of kenaf production in north China to a certain extent. Years of production, experiments show that the use of photoperiod theory of short-light for the “south of North planting” kenaf to stay home to break a new road. The following summary of the application of photoperiod theory in kenaf production research summary for reference. First, the Japanese kenaf flowering and vegetative growth effects on the length of the crop on the flowering of the impact of the past, there have been many reports at home and abroad, to prove that the phenomenon of flowering is the difference between day and night on the body caused by the reaction of the results. already