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山东省枣庄市农民程士斌总结出甘薯增产新技术——二级育苗法,使甘薯生长期延长20天～25天,产量提高15%左右。现将其方法介绍如下。
Cheng Zhibin, a farmer in Zaozhuang City, Shandong Province, summed up a new technology for raising sweet potato - second stage seedling raising method, which prolongs the growing period of sweet potato by 20 days to 25 days with a yield increase of about 15%. Now the method described below.