江苏射阳县农业部门摸索出一套山药青菜高效复种新技术。1992年推广200余亩，平均亩产山药300公斤，青菜7500公斤，亩净产值逾7000元。一、注重品种搭配。山药应选用籽粒粗壮、毛孔稀疏的山药豆，冬贮后第一年先繁育“一代种苗”，即每亩用40－50公斤山药豆，株行距7—8×25厘 Sheyang County, Jiangsu Province, agricultural sector to explore a set of yam high-efficient compounding new technology. In 1992 to promote more than 200 acres, the average yield of yam 300 kilograms, 7500 kilograms of vegetables, mu net output value of more than 7,000 yuan. First, pay attention to varieties with. Yam should be used coarse grains, sparsely-grown yam beans, winter storage after the first breeding “generation seedlings”, that is, with 40-50 kilograms per mu yam beans, spacing 7-8 × 25 PCT