【摘要】 田间实验表明 :(1)供Mg能提高烤烟产量和外观质量 ,增加中上等烟的比例、均价和 6 6 7m2 产值 ;(2 )供Mg可增加叶绿素等光和色素的含量 ,增强光和强度 ;(3)施Mg会降低烟叶的施木克值和糖 /碱比值 ,适当施Mg可协调烟叶各种化学成分 ,有利于烟叶的质量 ,结果以施用 2 6 5kg/hm2 MgSO4的效果最好更多还原

【Abstract】 A field experiment carried out in Yuxi, Yunnan showed that Mg supply improved the yield and apparent quality of flue-cured tobacco, increased the percentage of high- and mid-class tobacco leaf, its mean value and per-unit-area output, enhanced the content of chlorophyll and other photosynthetic pigments, thus increasing the photosynthetic intensity, and reduced Schmuck’s value and sugar/nicotine ratio. Therefore, proper supply of Mg will help to bring about harmonious relations among various chemical components and improve the quality of flue-cured tobacco. The rate of 265 kg MgSO 4 per hectare gave the best result.更多还原