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一、品种选择早春大棚栽培,主要以早熟为目的,故应选择较为早熟、抗寒、抗病性强、丰产稳产、耐弱光、适于密植和品质优良的品种。二、适时播种华北地区一般于11月下旬播种,此时正值严寒季节,温度低、光照差,外界环境不利于秧苗生长。所以,一般采用加温温室或日光温室加地热线育苗。发芽期温度应保持在白天30～35℃,夜间20～22℃,幼苗期温度白天20～25℃,夜间保持在17℃以上。同时,育苗营养土要加一定量的氮、磷、钾肥。浇水应本着“少而
First, the choice of varieties Early spring cultivation, mainly for the purpose of precocious, it should choose a more precocious, cold, disease resistance, high yield and stability, resistance to weak light, suitable for close planting and good quality varieties. Second, timely sowing In North China generally sowing in late November, this time comes when the cold season, low temperature, poor light, the external environment is not conducive to the growth of seedlings. Therefore, the general use of greenhouse or greenhouse and geothermal hotline nursery. Germination temperature should be maintained during the day 30 ~ 35 ℃, 20 ~ 22 ℃ night, seedling temperature during the day 20 ~ 25 ℃, kept at 17 ℃ above the night. At the same time, nursery nutrition soil to add a certain amount of nitrogen, phosphorus and potassium. Watering should be in ”less