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一、黄瓜发芽期(播种至2叶1心)此期生长发育特点是叶片形成、根系发育和花芽分化。若外界条件适宜,则幼苗生长健壮,下胚轴距地面3~4cm,播后4天,2片子叶呈75°角张开;5~6天为水平状展开;子叶肥大浓绿,叶缘稍向上卷呈匙形。该阶段出现的情况及原因:(1)植株生长缓慢、子叶小,叶缘下卷呈反转匙形。此等表现是由于短期的过低气温引起黄瓜冻害,进而造成子叶边缘变白上卷
First, the cucumber germination (sowing to 2 leaves 1 heart) The growth and development of this period is characterized by leaf formation, root development and flower bud differentiation. If the external conditions are suitable, the seedlings grow robust, the embryo axis from the ground 3 ~ 4cm, 4 days after sowing, two cotyledons were 75 ° angle open; 5-6 days for horizontal expansion; cotyledons thick green, leaf margin Slightly rolled up spoon-shaped. Occurred at this stage and the reasons: (1) slow plant growth, cotyledons, leaf margin was inverted spoon-shaped spoon. Such performance is due to the short-term low temperature caused cucumber frost damage, and then cause the cotyledons edge whitening volume