大田旺长期季节性干旱对白肋烟烟碱转化性状的调控效应

通过控制大田烟株旺长中、后期土壤相对水分含量，以研究大田土壤相对水分含量对白肋烟中烟碱向降烟碱转化的调控效应。结果表明，在晾制过程中，大田旺长期（轻度）干旱（土壤相对含水量为最大田间持水量的60%）处理导致B37高转化株烟碱转化率的变化存在差异，但始终低于对应晾制时间点正常供水处理烟叶的烟碱转化率；不同水分处理下，B37非转化株烟叶烟碱转化率均保持在较低水平，处理间差异不明显；在大田旺长期（轻度）干旱（土壤相对含水量为最大田间持水量的60%）有利于降低高转化株烟叶的降烟碱含量和烟碱转化率，一定程度上能够提高非转化株烟碱转化性状的稳定性。

Regulation effect of seasonal drought in field fast growing period on burley tobacco’s nicotine conversion

In order to research the controlling of drought in fast growing period, this paper through controlling the （field） soil water content in fast growing period of mid-later phase, researched the effect of soil water content on burley tobacco ＇ s nicotine conversion. The results showed that slight drought of soil （60% soil moisture） in fast growing period led to high converter ＇ s nicotine conversion difference between drought and normal water supply treatments among the air-curing period, which was lower than high converter ＇ s nicotine conversion of normal water supply all the time. Non-converter of different soil water supply treatment had similar percent of nicotine conversion （PNC）, and they were all in low level. The slight drought treatment （60% soil moisture treatment） in fast growing period was benefit to decrease high converter ＇ s nornicotine content and PNC, meanwhile, also could increase non-converter ＇ s stability in nicotine conversion character at a certain extent.