进入冬季,棚室蔬菜易受低温影响,尤其是一些旧大棚,保温性能较差,遇寒流袭击时棚内温度在10℃以下,蔬菜生长易受低温影响,必须提早采取预防措施。低温影响叶片受害:低温会使叶片光合作用减弱,营养物质制造减少,出现植株衰弱、僵果、坐果不良等现象。子叶期受害:表现为子叶边缘失绿,出现镶白边,当温度恢复正常 Into the winter, greenhouses vegetables vulnerable to low temperature, especially in some old greenhouses, poor insulation performance, when the cold shed attack temperature below 10 ℃, vegetable growth vulnerable to low temperature, we must take precautionary measures. Low-temperature impact on leaf damage: low temperature will make the leaves weakened photosynthesis, reduce the manufacture of nutrients, there plant weakness, stiff fruit, poor fruit set and so on. Cotyledons victims: the performance of cotyledons edge of the green, white trimmed edge, when the temperature returned to normal