本市海淀区东升公社老虎庙生产队种植的早熟洋白菜连年丰产,亩产达五、六千斤,在5月中旬即可上市,个别年份并可提早到5月上旬。抽苔率一般能控制在5%以下,最低可降到0.5%。取得早熟洋白菜连年丰产的主要经验如下。一、冷床培育壮苗:一般在霜降后四、五天开始育苗,畦长为40尺,宽5尺,播种籽4—5两,共复土两次,一次在种子发芽顶土时,一次在夹瓣(子叶)发足时。播种早,幼苗 The city of Haidian District, Dongsheng commune Tiger Temple production team planted precocious cabbage year after year high yield, up to five or six kilograms per mu, available in mid-May, individual years and early May early. The rate of moss generally can be controlled below 5%, the lowest can be reduced to 0.5%. The main experience of getting early cabbage in successive years is as follows. First, cooling bed nurturing strong seedlings: Generally four or five days after the frost began nursery, long as 40 feet long, 5 feet wide, sowing seeds 4-5 two times, a total of twice the soil, once the top of the seed germination, Once in the folder flap (cotyledons) hair full. Seeding early, seedlings