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随着近年来西瓜保护地栽培的发展,各地应用塑料大棚、塑料小棚等保护设施进行早熟西瓜栽培的越来越多,并且取得了明显的经济效益。但是保护地栽培由于受到科技发展水平和自然条件的限制,在北方,当3～4月天气异常时,如果遇到连续阴雨天气,在苗床或在其他保护地条件出现低温、弱光等不利情况时,将导致西瓜幼苗生长出现抑制。其主要表现为,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
With the development of cultivation of watermelon protected areas in recent years, the application of plastic greenhouses, plastic sheds and other protective facilities to carry out precocious watermelon cultivation more and more, and achieved significant economic benefits. However, due to the limited level of development in science and technology and natural conditions, in northern China, when the weather is abnormal from March to April, if it encounters continuous rainy weather, cold conditions such as low temperature and poor light in the seedbed or other protected areas When, will lead to watermelon seedling growth inhibition. The main performance of the new vine and young leaves significantly slowed down or even stopped growing, severe growth of seedlings point bending