Based on the apical dominance characteristic of plant, the two years' experimentation showed significant advantages on the sweet potato cultivation using the apical seedling technique. In 31 days after planting, the root growth of the sweet potatoes became earlier and faster than the backward 2 - 3 part seedlings, I. E. , 14. 8-17. 6 cm longer on the main cirrus, 1. 4 -2. 5 more side cirrus and 1. 3 -4. 6 cm longer on the side cirrus. The sweet potato's external appearance was smooth and yield 24%-30% greater than the backward 2 - 3 part seedlings which was statistically significant at P>0. 05. The orthogonal test results showed that (a) the seedling method had the highest F valve of 98.5, approaching the significant difference level of 99? And (b) the planting density and fertilization did not cause any significant growth differences as compared to the control. This new seedling breeding method took only 10 days in a greenhouse to obtain apical seedlings with roots for field application. After 80 days, the seedling cultivation coefficient was 191. 3, I. E. , 15. 9 times higher than that obtained by using the traditional technique. In addition, it cost less than the conventional method, and was believed to be feasible for commercialization.%依据植物顶端优势的原理,通过2年试验结果表明,甘薯带根顶端苗比传统的倒2～3段苗早生快长,栽种31 d,带根顶端苗比倒2～3段苗主蔓长增加14.8～17.6 cm,侧蔓数增加1.4～2.5条,侧蔓长增加1.3～4.6 cm,提早结薯且结薯多,薯皮光滑不开裂,增产幅度达24％～30％,经分析差异达显著水平.正交试验的育苗方式、种植密度、施肥量3因素中,育苗方式F值达98.5,接近极显著水平的99,种植密度和施肥量各水平间的差异均不显著.甘薯生产上传统的育苗方法,顶端苗只占1/3左右且不带根,抗旱能力相对较差.而带根顶端苗抗旱能力强,穴内带根顶端苗抗旱能力更强,更适合在我国干旱地区推广.甘薯带根顶端苗在种植时要种深一些,确保有2～3个结薯节才能发挥增产作用.采用创新的大棚基质快繁育苗方法,仅10 d就可获得供大田使用的抗旱能力强的带根顶端苗.该育苗技术繁苗速度快,经80 d繁苗系数为191.3,是传统繁苗系数的15.9倍,育苗成本低,适合于工厂化育苗.
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