烟叶物理特性与打叶质量的关系

Relationship between Physical Characteristics and Threshing Quality of Tobacco Leaf

通过描述性统计、逐步回归、偏相关和通径分析，研究了烟叶物理特性与打叶质量指标间的关系。结果表明：大中片率（≥12．7 mm）和≥6．35 mm叶片率在不同品种等级地区间无明显区别；碎片率（3．18～6．35 mm）、碎末率（＜3．18 mm）、粗梗率和叶中含梗率差异明显；烟叶物理指标与大片率、中片率、粗梗率间达到极显著水平，与小片率达到近似显著水平，其余片烟结构规格与物理指标之间无明显关系。随着烟叶拉力增大，中片率、小片率增加，大片率、粗梗率降低；随着叶片长度和宽度增大，粗梗率降低。

The relationship between the physical characteristics and threshing quality of tobacco leaf was studied through de -scriptive statistics, stepwise regression, partial correlation and path analysis .The results showed that there were no obvious differ-ences in big-middle leaf （≥12.7 mm） rate and big-middle-small leaf （≥6.35 mm） rate among different tobacco varieties （ or producing areas, or tobacco quality grades）, but there were obvious differences in broken leaf （3.18~6.35 mm） rate, broken par-ticle （＆lt;3.18 mm） rate, thick stalk rate and stalk content in leaf .The physical indexes had very significant correlation with big leaf （＆gt;25.4 mm） rate, middle leaf （12.7~25.4 mm） rate and thick stalk rate, and had a nearly significant correlation with small leaf （6.35~12.70 mm） rate, but there was no significant correlation between the physical indexes and other threshing quality indexes . Along with the increase in the tensile force of tobacco leaf , the rates of middle leaf and small leaf increased , while the rates of big leaf and thick stalk decreased .When the length and width of tobacco leaf increased , the thick stalk rate decreased .