蔬菜育苗多处冬春季的阴冷湿环境,极易形成“弱苗”,而招致育苗期的土传型猝倒病、立枯病的前后侵染,危害后成片死苗或全床毁种。通常讲蔬菜育苗的床土应尽量取用无病菌净土。但是净土取用也只能是相对地处于无侵染病菌状态,更何况还会重用有腐生残存的侵染病菌的旧床土及菜园? Vegetable nurturing many cold and wet environment in winter and spring, easily form a “weak seedlings”, which led to nurturing soil-based damping-off disease, blight before and after infection, endangered into pieces or whole bed seedlings destroyed . Generally speaking, the bed soil of vegetable nursery should try to use pure soil without bacteria. However, access to pure land can only be relatively in the state of non-invasive bacteria, not to mention the reuse of saprophytic remnants of the old bed soil and vegetable garden infection?