论文部分内容阅读
在北方应用塑料大棚、塑料小棚等保护设施栽培早熟西瓜,当3～4月天气异常时(连阴雨、低温、弱光等),新蔓与幼叶生长明显变缓甚至停止,严重者幼苗的生长点弯曲并消失,呈现自封顶现象。 这种生长点消失现象,因不同品种、低温弱光等逆境的程度和栽培管理条件的区别而有所差异。一般在1～2片真叶期,当设施内夜间气温低于15℃时,西瓜幼苗就会出现矮化和生长停止现象,
In the north, plastic water sheds and plastic sheds were used to cultivate precocious watermelons. When the weather was abnormal from March to April (even with rainy weather, low temperature, low light, etc.), the growth of new vine and young leaves slowed down or even stopped. In severe cases, Growing points bend and disappear, showing self-captive phenomenon. The disappearance of this growth point, due to different varieties, low temperature and low light, the extent of adversity and cultivation and management conditions vary. Generally 1 to 2 true leaf stage, when the facility at night when the temperature is below 15 ℃, watermelon seedlings will appear dwarf and growth stops phenomenon,