深冬季节是一年中日照时间最短、气温最低的低温寡照阶段,也是越冬茬黄瓜较难管理的阶段。受外界低温影响,棚内气温、地温也随之逐渐下降,多数温室会出现不同程度的低温障碍,表现为上部叶片皱缩变小、节间变短,结果部位上移,瓜条膨大缓慢,甚至形成瓜打顶。这些症状表现在地上部,但其原因主要出在地下根系上。笔者下乡进棚调研时发现,多数瓜秧长势不良的温室,扒开根部土壤观察,可见根系变成锈黄色,新根不发,根毛消失,这样的根群吸收养分和水分的能力大 The deep winter season is the one with the shortest sunshine duration and the lowest temperature in a year. It is also the stage where winter cucumber is difficult to manage. Affected by the external low temperature, shed temperature, ground temperature also will gradually decline, most of the greenhouse there will be different degrees of low-temperature obstacles, the performance of the upper leaves shrunk smaller, internodes shorter, the results of the site up, Even melon tops. These symptoms are manifested in the ground, but the main reason is underground roots. I went to the countryside into the shed investigation found that most of the melon seedling growing poor greenhouse, cling to the roots of the soil observed, we can see the roots become rusty yellow, the new root does not hair, root hair disappear, so the root group of large capacity to absorb nutrients and water