烤烟田间生长过程中叶片钾与钙比值的变化

The variation of ratio of potassium to calcium in flue-cured tobacco green leaves during the field growth process

田间条件下对烤烟下、中、上3个部位叶片生长发育过程中叶片的钾、钙含量及钾与钙比值的变化进行了研究.结果表明:在烤烟田间叶片生长发育过程中,随着烟叶部位的上升,叶片钾/钙值表现为逐渐增加的变化规律,而叶片钾和钙的含量均表现为逐渐下降的变化规律.随着叶龄的增长,新鲜烟叶中各部位叶片钾/钙值呈逐渐下降并趋于稳定的规律;叶片钾含量变化表现为逐渐下降,叶片钙含量变化表现为逐渐上升.3个部位叶片钾/钙值、钙含量的差异极显著,叶片钾含量的差异不显著;不同叶龄之间叶片钾/钙值的差异极显著,叶片钾和钙含量的差异显著.叶龄与叶片钾含量、钾/钙值呈极显著负相关,而与叶片钙含量呈显著正相关;烟叶中钾/钙和钙含量呈极显著负相关(r=-0.795**),与叶片钾含量呈极显著正相关(r=0.786**);烟叶中钾与钙含量呈显著负相关(r=-0.569*).

The changes of the potassium content, calcium content ratio of potassium to calcium value of different leaf position in flueured tobacco green leaves during the field growth process were studied. The results indicated that leaf ratio of potassium to calcium value was increased with the increasing and decreased with the increasing leaf ages. The potassium content was decreased with the ear increasing of position and age, the calcium concent was decreased with increasing of leaf position and increased with the increasing of leaf age. The difference of the potassium content and ratio of potassium to calcium value and leaf calcium content in different leaf positions was extremely significant and the difference of leaf potassium content was not significant. The leaf ratio of potassium to calcium value was extremely significant in different leaf ages. The leaf age was extremely negative significant correlation with the potassium content and ratio of potassium to calcium value extremely significont positive with the calcium content. The extremely significant negative correlations was observed between leaf ratio of potassium to calcium value and leaf calcium content （r = - 0. 795^＊ ＊ ）, and the extremely significant positive correlations was observed between leaf ratio of potassium to calcium value and leaf potassium content （r = 0. 786^＊ ＊ ）. There was significant negative correlations between leaf potassium and calcium content （r= -0.569^＊ ）.