形成灰色烤烟的原因及机理

Cause and mechanism of grey disorder in field flue-cured tobacco

通过对土壤、烟株、烟叶生理生化指标分析及田间生态环境调查和盆栽试验,系统研究了形成灰色烤烟的原因及影响品质的机理.结果表明,烤烟灰色烟叶发生与植烟土壤pH偏低、根层土壤含水量过高、土壤通透性差有密切关系,而影响灰色烟叶发生和严重程度的直接原因是土壤和烟叶内Fe,Mn等离子含量过高所致.在土壤pH值偏低,土壤含水量过高,根层土壤通透性差的条件下,Fe,Mn由不易被吸收的高价态转化成容易被植物吸收的低价态,造成烟株体内吸收积累Fe,Mn过多,营养平衡失调,引起烟草出现生理性中毒.

By field survey and potted plant test, physiologic and biochemical indexes of grey tobacco leaves and the soils resulting in grey disorder are measured, and the cause and mechanism of grey disorder are discussed. The results show that the occurrence of grey disorder have correlation with the low soil pH value high water content of root layer soil, its occurrence and severity degree have positive correlation with the Fe and Mn content of soil and tobacco leaf.