一、品种选择选择抗寒能力强、冬性强、不易发生抽薹、高产、品质好的品种,如高优它、佛罗里达683等。二、育苗一般在温室中育苗,苗龄60天左右,播种前苗床浇足底水,然后在床面上撒0.1~0.2厘米厚的细湿土并耙平床面,然后干籽播种。种子均匀撒布于床面,然后覆盖0.5厘米厚细土即可。播种后覆盖地膜保温保湿,出苗后撤除地膜。中午光照强时,要适当遮阴。苗期温度白天18℃~20℃、夜间13℃~15℃。长到2~3片真叶时,进行1次分苗,密度掌握在8厘米见方。分苗后喷施0.2%磷酸二氢钾和0.3% First, the choice of varieties Cold hardiness, winter strong, not prone to bolting, high yield, good quality varieties, such as high gifted it, such as Florida 683. Second, nursery Generally in the greenhouse nursery, seedling age of about 60 days before planting seedbed pouring foot water, and then spread 0.1 to 0.2 cm thick bed of wet soil and rake the bed, and then dry seed seeded. Seed evenly spread on the bed, and then covered with 0.5 cm thick soil can be. Mulch mulching after sowing insulation moisture, post-emergence removal of plastic film. Noon light when strong, should be properly shaded. Seedling temperature during the day 18 ℃ ~ 20 ℃, night 13 ℃ ~ 15 ℃. Grow to 2 to 3 pieces of true leaves, for 1 sub-Miao, density control in 8 cm square. Spraying 0.2% potassium dihydrogen phosphate and 0.3%