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培育壮苗是黄瓜早熟高产的基础。实践表明,黄瓜育苗期间的管理,重点在温度与水分。如果温、水失调,就会直接影响到壮苗的培育。 1.温度 当出现低温或者降温过快时,子叶边缘上卷,并变为白色。低温持续时间较长时,子叶先端稍下垂。如果受冻害,叶最初萎蔫,然后呈水浸状、失绿,继而变成白斑或干块,重者全叶干枯。当地温过低时,易形成寒根现象,叶部发黄、萎蔫,但根无异状。若长期处于10℃以下土温,且湿度大,则出现沤根现象,根系发黄,甚至腐烂,叶片深绿而不舒展,部分叶片边缘枯黄。 2.水分 如果缺水,幼苗子叶下垂,颜色深,叶形小。严重时子叶先端发黄,幼苗生长受到抑制,节间缩短,生
Nurturing strong seedlings is the basis for early cucumber high yield. Practice shows that cucumber seedling management, focusing on temperature and moisture. If the temperature and water disorders, it will directly affect the cultivation of strong seedlings. 1. Temperature When there is low temperature or excessive cooling, the cotyledons roll up and turn white. Longer duration of cryogenic, cotyledons slightly sagged. If frost damage leaves first wilted, then was flooded, green, and then into white or dry block, heavy whole leaf dry. When the local temperature is too low, easy to form a cold root phenomenon, yellow leaves, wilting, but no abnormal root. If the temperature is below 10 ℃ for a long time and the humidity is high, root phenomenon appears, the root is yellow or even rotten, the leaves are dark green without stretching, and the edge of some leaves is yellowish. 2. Water if water, seedling cotyledons, dark color, leaf shape small. Severe cotyledons apex yellow, seedling growth was inhibited, internodes shortened, students