中原地区甘蓝留种技术１．土地准备要求选择排灌两便，土质疏松的壤土，播种前把地整细整平。２．作畦畦内宽１米另加畦埂，埂宽０．２米，高０．２米，打实便于行走以利播种及管理，一般１亩大田用０．１亩育苗畦。３．播种（ｌ）播种量与时间以８月１５～２０日播完为宜... Central Plains cabbage stay kind of technology 1. Land preparation requires the choice of irrigation and drainage two, loamy loam soil, before sowing the whole fine. 2. For 畦 畦 within 1 meter wide plus 畦 埂, 埂 wide 0.2 meters, 0.2 meters high, easy to walk in order to facilitate seeding and management, the general 1 mu Daejeon 0.1 mu nursery 畦. 3. Seeding (l) sowing time and time to August 15 ~ 20 sowing finished is appropriate ...