甘蓝杂交播种期一般在7月底至8月上中旬,此时高温干旱,虫害严重,不利种子萌发和幼苗生长。往往需要重播或补播。近几年,我们改变传统播科技术,采用整地浇水保墒,覆细土和遮阴物,做到播后出苗整齐。具体操作如下。 一、播前准备 选择地势高,土质肥沃而疏松的大棚土壤作苗床。除去前茬残物、杂草,床地清理干净后,亩施腐熟有机肥2000kg,精耕细耙。播种前1-2天,浇足苗床底水,并在大棚顶部加盖遮阳网。一般从播科至长出真叶时可不用浇水。甘蓝杂交制种播期过早,种珠易长成坚实的叶球,不利抽苔,过晚种株不能通过春化阶段,正常抽苔开花。一般中晚熟品种要早播,早熟品种推迟播期,同时考虑花期相遇,父母本要错开播种。例如,“京丰一号”杂一代种的父本比母本提前5-7天播种。 二、播种方式 要在下午4-5点钟,不要放在上午。播前应浸 The sowing date of cabbage hybrid is generally from the end of July to the middle of August. At this time, high temperature and drought, serious insect pests, adverse seed germination and seedling growth. Often need to replay or make up. In recent years, we have changed the traditional sowing technology, watering and soil preparation using soil preparation, covering soil and shading, so that after sowing emerge tidy. The specific operation is as follows. First, before sowing to choose high-lying, fertile soil and loose soil for seedbed. Remove the stubble, weeds, clean bed, Mushi Shi rotten organic fertilizer 2000kg, intensive fine harrow. 1-2 days before sowing, pour foot seedling water bed, and the top of the greenhouse stamped net. Generally do not have to watering when growing leaves really grow. Seed sowing of cabbage premature sowing, easy to grow into a solid ball of leaves, adverse bolting, too late species can not be through the vernalization stage, the normal bolting flowering. Generally late maturing varieties to be sowed, early maturing varieties delayed sowing, taking into account the flowering encounter, parents had to stagger sow. For example, the male parent of “Jing Feng One” hybrids sow 5-7 days ahead of the female parent. Second, planting methods 4-5 o’clock in the afternoon, do not put in the morning. Baptist before broadcasting