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玫瑰茄南种北移,营养生长期延长,现蕾、开花、结籽期推迟,故遭早霜伤害难以得到花萼高产和成熟种子。光照处理,对花萼生长发育速率、现蕾、开花、结籽期,花萼重量均有影响,并因光照处理时数、时期不同而异。一般以6月底至7月初期间黑膜覆盖,处理时数9小时为宜。
Roselle south species moved north, prolonged vegetative growth, budding, flowering, seed setting delayed, so early frost damage it is difficult to get high calyx and mature seeds. Light treatment, the calyx growth and development rate, budding, flowering, seed stage, calyx weight have an impact, and because of light treatment time, different period. Usually in late June to early July covering black film, the treatment time of 9 hours is appropriate.