秋莴笋播种育苗正值七、八月高温季节,不仅种子发芽困难,而且由于昼夜温差小、日照长、夜温高,植株呼吸作用强,幼苗极易徒长,花芽提早分化抽苔。秋莴笋要培育壮苗,防止先期抽苔.在栽培管理上必须注意以下几点。一、选择耐热、对高温长日照反映比较迟钝的中、晚熟品种,如尖叶子、二青皮等。二、播种期适当推后,秋莴笋一般于7月中旬至8月上旬露地播种育苗,可以把定植后的生育期安排在立秋以后天气开始转凉时,以利植株迅速生长,防止先期抽苔。三、培育壮苗主要措施之一是为幼苗创造一个良好的生长环境条件,可在播种床上面用遮阳网或苇席、柴草、旧棚膜等搭一荫棚,减少日照.降低苗床温度,防止热雨直接冲刷,以利出苗和防止先期抽苔。播种前, Autumn lettuce sowing nursery positive in July and August hot season, not only the seed germination difficulties, but also because of small temperature difference between day and night, long sunshine, high night temperatures, strong plant respiration, very easy to seedling seedlings, early bud differentiation bolting. Autumn Lettuce to nurture strong seedlings to prevent pre-bolting.In the cultivation and management must pay attention to the following points. First, the choice of heat, reflecting the relatively slow heat of the long sunshine, late-maturing varieties, such as pointed leaves, two green peel and so on. Second, the appropriate push the sowing, the autumn lettuce generally open seeding in mid-July to early August nursery, the planting period can be arranged after planting in the autumn after the weather started to cool, to facilitate rapid plant growth, to prevent the pre-bolting . Third, one of the main measures to nurture strong seedlings is to create a good growing environment for seedlings, seed beds can be used in the shade net or reed mat, firewood, old shed film and so take a shade, reduce sunshine.Slower seedbed temperature, To prevent direct erosion of hot rain, in order to facilitate the emergence of seedlings and prevent pre-bolting. Before sowing,