一、受冻症状 油菜受冻的时间程度不同,其表现的症状也不一样,大致有以下几种: 1.叶片僵硬 当气温降至-3℃～-5℃时,叶片细胞间隙和细胞内水分结冰,细胞因失水导致叶片脆而易折,呈僵硬状。当气温升高时冰粒消融,叶片复原。这种冻融交替频繁时,叶尖、叶边开始焦枯,随着气温的下降,叶片逐渐变黄再变白或干枯。 First, the cold symptoms of rape frozen in different degrees of time, the performance of the symptoms are not the same, roughly the following: 1. Leaf stiffness when the temperature dropped to -3 ℃ ~ -5 ℃, the leaf cell gap and intracellular Water icing, the cell due to dehydration leaves crisp and easy to fold, was stiff. When the temperature increases ice particles ablation, leaf recovery. This frequent alternating freeze and thaw, tip, leaf edge began to coke, with the temperature dropped, the leaves turn yellow and then white or dry.