烟草在未达到品种特性或常年栽培应有的高度和叶片数而提前现蕾开花，称为早花。早花的烟草叶片数少、小而薄，产量和品质显著降低。造成烟草早花主要原因有：气候因素同一品种不同年份或不同移栽期，早花现象也有所不同，这与温度和日照有密切的关系。高温有利于烟株生长，低 Tobacco in the species does not meet the characteristics or perennial cultivation should have the height and the number of leaves and budding ahead of flowering, known as the early flowering. Early flowering tobacco leaf number less, small and thin, yield and quality significantly reduced. The main causes of tobacco as early as possible are: climatic factors of the same species in different years or different transplanting period, the phenomenon of early flowering is also different, which is closely related with temperature and sunshine. High temperature is conducive to tobacco plant growth, low