红麻夏播留种目前已成为华南地区普遍采用的留种方法之一。它既可利用优越的气候条件,缩短留种占地时间,提高复种指数,增加单位面积的经济效益。又可以克服春播留种麻株高大因台风造成倒伏而影响种子产量与质量。但夏播留种是否会引起种性退化?这一问题正如短光照制 Kenaf summer sowing has now become South China one of the methods used to stay. It can not only take advantage of the superior climatic conditions, shorten the time to stay, increase the multiple cropping index and increase the economic benefits per unit area. But also can overcome the spring sowing seedling height due to typhoon caused by lodging and affect seed yield and quality. However, whether the planting of summer sowing will lead to the degeneration of species? The issue is just like short-light photography