红麻属于短日照作物,其花芽的分化、形成需要较短的日照.在长日照条件下,红麻的生殖生长受到抑制,营养生长旺盛,营养生长期延长.所以把南方迟熟红麻品种引种到高纬度的北方种植后,由于北方长日照的影响,能获得很高的麻皮产量,但枯霜前却收不到成熟的种子,形成年年种麻,年年调种的被动局面.为了研究南种北植红麻就地留种问题,我们从 Red kenaf is a short-day crop, its flower bud differentiation, the formation of the need for shorter sunshine.Under long-day conditions, kenaf reproductive growth is inhibited, vegetative growth, vegetative growth period.So the southern late maturity kenaf varieties Introduced to the northern latitudes of high latitudes, due to the influence of the northern long sunshine, can get a high yield of hemp, but before the dead frost did not receive mature seeds, the formation of year-long seeding, seeding every year passive situation In order to study the problem of inbreeding in the South of the North, we follow from