CAJ | 학술논문

对打顶后不同时期断根烤烟的氮素吸收、分配和干物质累积、上部烟叶烟碱及钾含量的变化进行研究。结果表明，不同时期断根均促进烤烟氮素的吸收，断根越早效果越明显；与对照相比，断根处理后，烟株吸收的氮素在上部烟叶的分配比例变化不明显；但降低中下部烟叶的分配比例，提高根茎的分配比例，其中打顶后10 d和15 d断根处理更显著；打顶后断根能促进上部烟叶干物质累积，减少烟碱合成量，提高钾素的吸收量，打顶后10～15 d断根处理效果较明显。
대타정후불동시기단근고연적담소흡수、분배화간물질루적、상부연협연감급갑함량적변화진행연구。결과표명，불동시기단근균촉진고연담소적흡수，단근월조효과월명현；여대조상비，단근처리후，연주흡수적담소재상부연협적분배비례변화불명현；단강저중하부연협적분배비례，제고근경적분배비례，기중타정후10 d화15 d단근처리경현저；타정후단근능촉진상부연협간물질루적，감소연감합성량，제고갑소적흡수량，타정후10～15 d단근처리효과교명현。
Different root pruning time after topping on flue -cured tobacco nitrogen absorption , distribution, dry matter accumulation and change of nicotine and potassium content in upper leaves were studied .The results showed that root pruning in different periods all contributed to nitrogen absorption of flue -cured tobacco .And the earlier the root pruning , the more obvious the effect was .Compared with control , the distribution ratio of nitrogen in upper leaves of root pruning treatment did not change obviously , that in middle and lower leaves reduced and that in roots and stems improved .The change was more prominent of root pruning on the 10th and 15th day after topping.Root pruning after topping could promote dry matter accumulation , K absorption and reduce nicotine syn-thesis.The effects of root pruning on the 10th and 15th day after topping was more obvious .