目前正值大棚莴笋收获期,有农友反映种植的莴笋茎部出现不同程度的开裂,裂口部分黄褐色,易腐烂。裂茎的莴笋,因外观受损、食味变劣,商品价值大打折扣。莴笋为啥会“裂茎”?究其主要原因:一是品种选择不当。一般紫叶莴笋含水量较高,容易出现裂茎;而绿叶莴笋含水量较低,出现裂茎相对较少。二是肥水供应不均。莴笋 At the moment when the greenhouse lettuce harvest period, some farmers reflect the planting of lettuce stems appear different degrees of cracking, cracking part of the brown, perishable. Stem lettuce stem, due to the appearance of damage, deterioration of food, greatly reduced the value of the goods. Why lettuce “split stem”? The main reason: First, the improper selection of varieties. Generally purple leaf lettuce moisture content is higher, prone to split stem; and green leaf lettuce moisture content is lower, there is relatively less split stem. Second, uneven supply of fertilizer. Lettuce