【摘要】 研究了6种农艺覆盖措施对云烟85叶片淀粉含量积累的影响。结果表明:(1)云烟85各部位烟叶淀粉含量的变化曲线总体上符合3次多项式回归模型。移栽后40 d内,叶片淀粉含量较低;移栽后40～60 d,淀粉迅速积累,之后变化趋于稳定,在生长后期部分处理的淀粉含量又有所下降。(2)下部叶、中部叶和上部叶分别在移栽后的50．60,70 d以内,不同处理间烟叶淀粉含量的差异较大,之后各处理间差异逐渐减小,表明大田前中期处理间烟叶淀粉含量的变异大于中后期。(3)成熟采收期下部烟叶淀粉含量在处理间的变异系数较大(9．5%- 12．6%),上部烟叶淀粉含量的变异系数次之(5．4%-8．3%),中部烟叶的变异系数较小(3．6%-4．0%)。(4)不同覆盖处理间烤后烟叶淀粉含量差异达显著水平,其中以“旺长期揭膜+中耕培土+垄上覆盖秸秆”处理的烟叶淀粉含量较低,在中、上部叶中表现得尤为明显;烤后烟叶淀粉含量与成熟期鲜烟叶淀粉含量呈极显著正相关,相关系数为0．752。更多还原

【Abstract】 Effects of six kinds of agronomic mulching measures on starch accumulation in the leaves of Yunyan 85,a flue-cured tobacco cultivar,were studied. The results indicated that; (1) Change of starch content could generally match regression model of cubic polynomial curve in flue-cured tobacco leaves of different positions of Yunyan 85. 40 days after transplanting,the starch content was lower;the starch content accumulated rapidly from 40 to 60 days after transplanting,then began to remain stable;The starch content after some treatments decreased slightly at ripe stage. (2) Starch content among treatment showed big differences within the changes before the 50 days for lower leaf ,60 days for cutters and 70 days for upper leaf after transplanting,and the variation then began to decrease,which indicated that the variation of starch content among treatments was more significant at early stage than later during field growth. (3) For different treatment at ripe stage,variation coefficients of starch content were big (9. 5%-12. 6%) for lower leaf,medium (5. 4%-8. 3%) for upper leaf,and low (3. 6%-4. 0%) for cutters. (4) The difference of starch content in cured leaf was significant among treatments. The treatment of "picking up film+earth up during the blooming period+mulching straw on the ridge" has lower starch content ,particularly showing this trend for cutters and upper leaves. Starch content of cured leaf had significant positive correlation (r= 0. 752* ) with that of fresh leaf at ripe stage.更多还原