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夏季高温多阵雨,并易出现严重干旱、病害,成为培育壮苗的主要障碍。因此,为保障秧苗正常生长,育苗时要采取适当措施以克服各种危害,具体应做好以下“五防”: 1.防高温 高温易造成一些蔬菜(如芹菜、莴苣等)发芽困难,不利于秧苗生长,可采取催芽、降温措施。方法是:浸种8小时后用湿纱布包裹,然后在井中或其它冷凉的地方进行菜种催芽,或将种子进行低温处理(芹菜2℃～5℃处理48小时,莴苣5℃处理72小时),具有明显促进发芽的效果,能使发芽率增加1倍。处理后待种子萌动可直接播种。育苗时,选择通风良好的地块做苗床,并要采取降低苗床温度的措施,如在苗床上撤一些截短的麦秆或稻草,用寒
In summer, it is prone to showers and prone to serious drought and disease and become the main obstacle to nurturing strong seedlings. Therefore, in order to ensure the normal growth of seedlings, nurturing should take appropriate measures to overcome various hazards, the specific should do the following “five prevention”: 1. Anti-high temperature can easily cause some vegetables (such as celery, lettuce, etc.) germination difficulties, not Contribute to the growth of seedlings, can take the germination, cooling measures. The method is as follows: after soaking for 8 hours, wrapping it with wet gauze, then germinating the seeds in the well or other cold place, or treating the seeds under low temperature (the celery is processed for 48 hours at 2 DEG C to 5 DEG C and the lettuce is treated for 72 hours at the temperature of 5 DEG C) , With the obvious effect of promoting germination, can make the germination rate doubled. Seed germination can be sown directly after treatment. Nursery, the selection of well-ventilated plots to do seedbed, and to take measures to reduce the seedbed temperature, such as the withdrawal of some truncated straw or straw on the seedbed with cold