烤烟的外观和内在品质受多种因素的综合影响。从植物营养的角度而言,镁、锌、硼等营养元素对植物生长发育的作用早已被人们所认识。虽然目前有关这三种营养元素对烤烟品质的影响已有所研究,但迄今尚无定论。烟草对镁的吸收量相当高,正常烟叶的含镁量约占干物质重的0.4～1.5％,若低于0.2％,就会出现缺镁症状。pinkerton(1970)报道过缺镁对烤烟叶片质量的影响,主要表现在烟叶外观色泽差,叶片薄,吃味差。woltz等人(1948)发现:烟叶中镁的浓 The appearance and inherent quality of flue-cured tobacco are affected by the combination of many factors. From the plant nutrition point of view, magnesium, zinc, boron and other nutrients on the role of plant growth and development has long been known. Although the impact of these three nutrients on the quality of flue-cured tobacco has been studied to date, it has not been decided yet. The amount of magnesium absorbed by tobacco is quite high, and the content of magnesium in normal tobacco leaves is about 0.4-1.5% of dry matter weight. If it is less than 0.2%, magnesium deficiency symptoms will occur. Pinkerton (1970) reported magnesium deficiency on the quality of flue-cured tobacco leaves, mainly in the appearance of poor color leaves, leaves thin, poor taste. Woltz et al. (1948) found that the concentration of magnesium in tobacco leaves is high