烤烟底脚叶对烟叶含钾量及品质的影响

Influence of Remaining Bottom Leaves on Potassium Content and Chemical Characteristics of Flue-cured Tobacco

与生产中的常规措施 (打顶时除去底脚叶 )相比 ,在打顶时继续保留底脚叶 ,让其自然衰老 ,可以增强打顶后烟株根系的光合产物供应 ,提高根系的代谢活性 ,有利于烟株从生长环境中进一步吸收钾 ;同时由于底部叶片在打顶时含有丰富的钾 ,这部分钾随着叶片后期的正常衰老可以向植株的其它生长中心转运 ,从而提高烟株其它叶片的含钾量和改善烟叶的内在品质。建议生产中在株行距较大 ,通风透光的种植模式下 ,可以考虑打顶时继续保留底脚叶。

s:The field experiment was conducted to determine the effect of remaining bottom leaves when topping on potassium content and quality of flue-cured tobacco leaves The study demonstrated that the potassium content and quality of flue-cured leaves had been improved as the remaining bottom leaves enhanced the translocation and supply of carbohydrates to roots,and uptake of potassium from soil,in addition to the translocation of potassium from bottom leaves to others It is recommended that bottom leaves could be remained as long as its senescence in condition that tobacco is planted in a less dense