我国劳动农民一贯重视选育良种的工作,因此,我国的农家品种特别丰富。但目前十字花科蔬菜品种普遍存在经济性状变劣,对不良环境的抵抗力减弱,产量降低,品质变坏等混杂退化现象。现就防止品种退化问题,谈一些看法供参考。一、培育健壮母株: 1.合理安排轮作。十字花科蔬菜的不同种类要避免连作,同一种蔬菜的同品种和不同品种间也不宜连作,以免机械混杂和病虫为害。 2.合理用肥和用水。对留种用的大白菜、包心菜,头年生长后期要适当减少肥水用量和次 The working peasants in our country have always attached great importance to the breeding of fine varieties. Therefore, the peasant families in our country are particularly rich in varieties. However, current cruciferous vegetable varieties generally have worse economic traits, weaker resistance to adverse environment, reduced yield and poor quality and other mixed degradation phenomena. Now on the issue of preventing the degeneration of varieties, to talk about some views for reference. First, nurturing robust mother plant: 1. Reasonable arrangements for rotation. Different types of cruciferous vegetables to avoid continuous cropping, with the same species of vegetables and different varieties should not be interlinked, in order to avoid mechanical hybrids and pests. 2. Reasonable use of fertilizer and water. On the remaining species of cabbage, cabbage, the first year of growth to reduce the amount of fertilizer and water