Status of the contents of mineral elements and their relationships with total sugar and nicotine content in flue-cured tobacco leaves in Hunan province

Chinese. 确定湖南烤烟矿质元素的适宜含量范围，为烤烟的营养平衡提供科学依据。对来自湖南8个烟区的61份C3F等级烤烟样品的营养元素及总糖、烟碱含量进行了测定，采用统计方法分析了营养元素与总糖及烟碱含量间的关系。当烤烟烟叶中的氮、磷、钾、钙、镁、硫、氯含量分别为15.0~20.0，1.5~4.0，15.0~30.0，22.13~27.38，1.50~2.50，5.50~7.00和3.00~4.40 g/kg，铜、锰、锌和硼的含量分别为17.69~18.34，140~168，34.36~54.31和11.87~40.00 mg/kg时，烟叶总糖和烟碱含量较为适宜，糖碱比为8~10，有利于吃吸味间的平衡。湖南烤烟营养元素在各烟区间存在较大的变异，其中氮、磷、钾、钙、锌、硼、氯含量适中，镁、铜、锰含量较低，硫含量较高，各烟区应根据烟叶矿质元素含量的状况平衡施肥。_

English. In order to determine the feasible contents of mineral elements of flue-cured tobacco in Hunan, and give a scientific base for nutrient balance of tobacco. The contents of mineral elements, total sugar, and nicotine in flue-cured tobacco leaves were determined for 61 samples of grade C3F from 8 tobacco-growing countries in Hunan province, and the relationships between mineral elements and total sugar, nicotine contents were analyzed by using statistical methods. When the contents of N, P, K, Ca, Mg, S, Cl were in the range of 15.0―20.0, 1.5―4.0, 15.0―30.0, 22.13―27.38, 1.50―2.50, 5.50―7.00, 3.00―4.40 g/kg, and Cu, Mn, Zn, B were in the range of 17.69―18.34, 140―168, 34.36―54.31,11.87―40.00 mg/kg respectively, the contents of total sugar and nicotine were suitable in general, and the ratio of total sugar to nicotine ranged from 8 to 10 with good balance for smoking quality indexes. There existed big variation of different mineral elements among different Hunan tobacco-growing areas. The contents of Mg, Cu and Mn were low; the content of S was high; the contents of N, P, K, Ca, Zn, B and Cl were suitable. In the last, based on the status of the contents of mineral elements in tobacco leaves in 8 tobacco-growing countries, the suggestions for fertilization balance were given accordingly, each tobacco-growing area could be fetilized balanceably according to mineral elements in tobacco leaves.