1播种前的准备1.1育苗棚的准备穴盘育苗的苗床要选择地势较高,避风向阳,东西南三面没有高大建筑物或树木的地方,保证建棚后有充足的光照。育苗棚应坐北朝南,东西走向,排灌方便的田块。棚膜选择聚乙烯无滴膜,保温材料最好选择棉被。播种前15d搭建好育苗大棚,做好育苗畦,棚上盖好棚膜增温。 1 before sowing preparation 1.1 nursery shed preparation Seedling nursery seedbed to choose a higher terrain, sheltered sunny, east and west on three sides no tall buildings or trees, to ensure that there is sufficient light after the shed. Nursery shed should sit north toward south, east-west, irrigation and drainage convenient plots. Diaphragm film selection polyethylene drip film, thermal insulation materials the best choice quilts. 15d before planting sowing nursery greenhouses, nursery stocking, greenhouse shed film warming.