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为解决红麻南种北植后,就地不能留种的技术问题,以植物光周期理论为基础,研究在大田条件下,进行光周期诱导对红麻生长发育及构成种子产量的影响。试验指出,晚熟红麻品种青皮三号的临界光期为12～13小时,在北方短光照条件下,生育期比两广地区缩短一半左右(112～115天),其花芽诱导的最低暗期天数:子叶阶段处理15天,4～8片真叶处理5天,少于5天暗期不能诱导花芽分化。试验还证明,在每亩留苗4～5万株高密度下,苗龄5～6片真叶起,短光照处理40天左右,结束处理10～15天内打顶等项,是获得种子高产的有效措施。
In order to solve the technical problem that the kenaf plant can not be planted in the north after plantation in the south of kenaf, based on the plant photoperiod theory, the effect of the photoperiod on kenaf growth and seed yield was studied under the field conditions. The experiment indicated that the critical photoperiod of late maturing Kenaf variety Qingpi 3 was 12 ~ 13 hours. Under the condition of short northern light, the growth period was shortened by about half (112 ~ 115 days) : Cotyledon stage for 15 days, 4 to 8 true leaves for 5 days, less than 5 days can not induce bud differentiation. The test also proved that in the Miao Miao 4-50000 high density, the seedling age 5 ~ 6 true leaves from the short light treatment for about 40 days, the end of the treatment of 10 to 15 days topping and other items, is to obtain high seed yield Effective measures.