Using tobacco variety of K326 as the test material, the effects of different topping stage and effective remained leaves on the agronomic characters, economic characters and quality of flue-cured tobacco were studied, under the ecological conditions in Luxi County, to enhance yield and quality of flue- cured tobacco. Results： When the effective remained leaves was the same, as the topping stage delayed, plant height and stem girth increased, length and width of maximum leaf decreased, yield and output value rose first and fell later, sugar content, scores of chemical composition harmony, index and scores of sensory taste increased first and decreased afterwards. When the topping stage was the same, with the increase of the effective remained leaves, plant height increased, stem girth, maximum leaf length and maximum leaf width decreased, yield increased, but output value decreased slightly, the sugar content rose, total nitrogen, nicotine and K＋ fell, chemical composition harmony and sensory taste scores did not change significantly. In a word, when topping at early flowering stage and remaining 18 leaves, the comprehensive effects of K326 was the best, upper grade proportion of tobacco, average price and output value was the highest, tobacco chemical composition was comparatively harmonious and sensory taste scores were better.
Guizhou Agricultural Sciences
effective remained leaves