烤烟田间生长过程中叶片主要品质指数的变化

对田间状况下烤烟下、中、上3个部位叶片生长发育过程中主要品质指数的变化进行了分析。结果表明:在烤烟田间生长发育过程中,随着烟叶部位的上升,叶片中氮/碱比值表现为“V”型变化;叶片还原糖/总糖比值表现为逐渐升高的变化规律;叶片钾/氯比值表现为“∧”型变化;不同烟叶部位之间氮/碱、还原糖/总糖、钾/氯比值的差异均不显著。随着叶龄的增大,叶片氮/碱比值呈现出下降并趋于稳定的变化规律,叶片还原糖/总糖比值和叶片钾/氯比值的变化无明显规律;不同叶龄之间氮/碱比值的差异极显著,而叶片还原糖/总糖比值、叶片钾/氯比值的差异均不显著。相关分析表明,叶龄与叶片氮/碱比值之间呈极显著负相关,而与叶片还原糖/总糖比值、叶片钾/氯比值之间呈不显著正相关;烟叶中钾/氯比值与氮/碱比值、还原糖/总糖比值之间相关性不显著,还原糖/总糖比值与氮/碱比值之间相关性也不显著。

Variation of Main Quality Indexes of Flue-cured Tobacco Leaf during the Period of Growth

The change of main quality indexes of flue-cured tobacco leaf during the period of growth was studied.Furthermore,the variance and relation analysis with leaf N/Nic,leaf RS/TS and leaf K_2O/Cl~-of green leaf,which were in the same variety,growing condition,fertilization standard and cultivation,were carried out.Leaf samples were taken from different leaf positions and ages in Heilonjiang Province.The results indicated that leaf RS/TS and leaf K_2O/Cl~-were not regularity with the the increment of leaf age.The difference of these main quality indexes in different leaf positions was not significant.The leaf N/Nic was extremely significant in different leaf ages.The leaf age was not significant correlation with leaf RS/TS and leaf K_2O/Cl~-.The extremely significant negative correlation was observed between leaf age and leaf N/Nic(r=-0.805~(**)).There was not significant correlation among these main quality indexes.