一般情况下,12月下旬至2月中旬有一段低温寡照天气,极易造成大棚蔬菜植株黄化,生长停滞,重者植株受冻而死,即使能越冬,也会出现植株小、叶片小、节间短、花打顶等现象,导致严重减产,这是对冬暖大棚蔬菜生产的最大威胁。对这种灾害性天气可采取如下几种对策。 Under normal circumstances, from late December to mid-February there is a period of low-temperature weather, easily lead to greenhouse vegetable plants yellow, growth stagnant, severe cases of plants died of freezing, even if the winter, there will be small plants, small leaves, Internodes short, topped with flowers and other phenomena, leading to serious cuts, which is the greatest threat to winter warm greenhouse vegetable production. The following kinds of countermeasures can be taken for such disastrous weather.