洋葱、西瓜、菜豆一年三熟套种,技术简单,好栽培,易管理,且产品畅销,效益高,适合大面积推广。一、洋葱选用美国杂交一代品种超级502,该品种早熟、高产、质优、美观。每667平方米洋葱只需苗床66.7平方米,种子100克。9月10～20日育苗,11月底移栽,按大小苗分级定植。最好采取高畦 Onion, watermelon, beans three sets of intercropping a year, technology is simple, good cultivation, easy management, and selling products, high efficiency, suitable for large-scale promotion. First, the onion selection Super hybrid 502 generation of the United States, the varieties of early maturity, high yield, high quality, beautiful. Only 66.7 square meters of seedbed per 667 square meters of onion, 100 grams of seeds. September 10 to 20 nursery, transplanting by the end of November, graded according to the size of seedlings. It is best to take Takako