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大白菜制种主要有三种方法:即小株制种、成株制种和半成株制种。目前,在山东主要采用小株制种法,其优点:小株无需形成叶球,直接抽薹开花;生育期短,生活力旺盛,分枝力强,抗倒伏性强;适于密植;籽粒饱满,种子产量比成株产量高15～20%;苗床育苗,省工省时,降低制种成本等。主要措施如下: 一、培育壮苗 1.苗床准备选土壤肥沃、地势高燥、排灌方便的地块,东西向建育苗床。前茬忌甘蓝等十字花科蔬菜,以减少病虫危害。每制种1亩大白
There are three main methods for seed production in Chinese cabbage: small seed production, adult seed production and semi-finished seed production. At present, the main method of seed production in Shandong, its advantages: small plants without the formation of leaf ball, direct bolting flowering; short growth period, strong vitality, branching power, lodging resistance; suitable for close planting; grain full , Seed yield 15% to 20% higher than the adult plant; seedling nursery, labor-saving time and reduce the cost of seed production. The main measures are as follows: First, nurturing strong seedlings 1. Seedbed ready to choose soil fertile, topography dry, irrigation and drainage of plots, east-west build seedbed. Preserved Brassica oleracea and other cruciferous vegetables to reduce pest damage. 1 mu per production system