如皋市地处长江下游北岸,土质砂壤。近几年来,黄皮洋葱保鲜出口已成为我市商品农业的一大项目,栽培面积基本稳定在333.3公顷(ｈｍ2)。后茬种什么?怎么种?为此,市农业局与市农科所于1997年自立课题进行研究。经过三年的试验实践,总结出黄皮洋葱———夏大白菜———毛豆一年三熟 Rugao is located in the north bank of the Yangtze River, sandy soil soil. In recent years, fresh yellow onion exports have become the city’s commodity agriculture a major project, the cultivation area was basically stable at 333.3 hectares (hm2). What kind of crop? How to grow? To this end, the Municipal Bureau of Agriculture and City of Agricultural Science in 1997 independent research. After three years of experimental practice, summed up the yellow onion --- summer cabbage - soybeans cooked three times a year