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甘薯种苗素质与产量有密切的关系。试验表明,壮苗早生快发,结薯早而多,大薯率高,有明显的增产效果,而弱苗一般减产幅度为10～36%。因此,认真选用壮苗,淘汰弱苗,是甘薯既经济而有效的增产指施之一。我国南方由于气候温暖,甘薯1年4季都可种植,不少农民图方便,不建立专用苗圃,在大田不认真选择壮苗,随意割苗种植,往往造成缺苗多,生长差,空株率高,产量低。据调查,弱苗主要有如下几种:
Sweet potato seedling quality and yield are closely related. Tests showed that strong seedling early fast hair, tuber sooner, tuberous rate is high, a significant yield-increasing effect, while the weak seedlings generally yield reduction range of 10 to 36%. Therefore, careful selection of strong seedlings, out of weak seedlings, sweet potato is both economic and effective stimulation of production one. Due to the warm climate in southern China, sweet potato can be planted in 1 year and 4 seasons. Many peasant plans are convenient and do not set up special nurseries. In the field, they do not choose strong seedlings, and planted seedlings at random, often result in lack of seedlings, poor growth, High rate, low output. According to the survey, weak seedlings mainly include the following: