田间摘除不适用鲜烟叶数量和时期对上部烟叶物理性状的影响

Effects of the number of field inapplicable fresh leaves removed and the removing period on physical properties of upper leaves of flue-cured tobacco

采用正交试验设计,运用极差分析、方差分析、综合评价方法研究了邵阳烟区不适用鲜烟叶的田间摘除叶片数和时期对上部烟叶物理性状的影响。结果表明:摘除下部叶片数量主要影响烤烟上部烟叶的开片度、叶片厚度、平衡含水率、叶质重;摘除下部叶片数和摘除时期以及摘除顶叶片数主要影响烤烟上部烟叶的单叶重和含梗率。邵阳烟区稻田烤烟优化烟叶结构以打顶时摘除下部2片烟叶和倒数第1烤时摘除顶部1片烟叶为最佳。

To identify the optimum number and period for removing the field inapplicable fresh leaves, range analysis, variance analysis and comprehensive evaluation way of orthogonal experiment design method were employed to study the influence of different number of the removed field inapplicable fresh leaves and the period of removing on physical properties of upper leaves of flue-cured tobacco. The results showed that the number of the lower leaves removed was the key factor for the degree of leaf opening, thickness of leaf, balance water ratio and weight per unit leaf area of the upper leaves of flue-cured tobacco; the number of the removed lower leaves, the removing period for the lower leaves and the number of the removed top leaves were the key factors for the weight per leaf and stem ratio of the upper leaves of flue-cured tobacco. The optimal model for structure optimization of flue-cured tobacco in Shaoyang was removing 2 lower tobacco leaves at the time of tobacco topping and removing 1 top tobacco leaves at the time of the first roast from the bottom.