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结球莴苣又叫生菜,其口感脆嫩、味甜,风味好,是深受群众喜爱的蔬菜之一。邯郸自87年引进栽培以来,种植面积逐年扩大。但是生产上由于栽培管理不当,常常出现结球异常现象,使生菜品质变劣,产量下降。据调查,常见的结球异常表现及原因如下: 一、不结球 1.早春低温抑制了叶数的分化及莲座叶的生长,致使心叶直立,不进入结球阶段。 2.幼苗期氮、磷供应不足,影响了叶数的分化。 3.结球期温度过高。据调查,气温在25℃
Knotted lettuce, also known as lettuce, its crisp taste, sweet, good flavor, is loved by the masses one of the vegetables. Since the introduction of cultivation in Handan in 1987, the planting area has been expanded year by year. However, production due to improper cultivation and management, often a ball abnormalities, poor quality of lettuce, production decline. According to the survey, the common abnormal performance of the ball and the following reasons: First, no ball 1. Low temperature in early spring inhibited the differentiation of leaf number and the growth of rosette leaves, leaving the heart leaf upright, do not enter the stage of the ball. 2. Seedling nitrogen, phosphorus supply, affecting the number of leaf differentiation. 3. The junction temperature is too high. According to the survey, the temperature at 25 ℃