不同类型植烟土壤施氮水平对烤烟生长发育的影响

采用田间试验法，探讨了不同类型植烟土壤施氮水平对烤烟生长发育的影响．结果表明：施用氮肥有利于提高烤烟的单叶重，烟叶烟碱含量与施氮量、总氮、总糖、还原糖、氮碱比、糖碱比、糖氮比等的相关性较高．综合考虑田间试验不同施氮量处理的烤烟产量、产值、均价和中上等烟比例及内在化学成分，初步得出：在没有施用有机肥的条件下，在土壤碱解氮含量为105．61、142．29、168．37mg·kg^-1的黄泥田、灰黄泥砂田、青格灰泥田中分别施氮165．0—192．0、142．5—165．0、120．0—142．5kg·hm^-2，有利于优质烟叶的形成．

Effects of nitrogen levels on growth of flue-cured tobacco in different types of tobacco-planting soil

The field experiment was conducted to probe into the effects of nitrogen levels on growth of flue-cured tobacco in different types of tobacco-planting soft. The results indicated that nitrogen application was conducive to the increasing of weight per leaf of flue-cured tobacco. The nicotine content of tobacco had a close correlation with nitrogen application rate, total nitrogen, total sugar, reducing sugar, ratio of nitrogen to alkali, ratio of sugar to alkali, ratio of sugar to nitrogen, and so on. Based on the comprehensive consideration of the yield, output value, average price, proportion of superior leaf and intrinsic chemical composition of flue-cured tobacco in different nitrogen treatments of the field experiment, the following was preliminarily obtained： under the condition of no organic fertilizer, it was beneficial to the formation of high-quality tobacco when the nitrogen application rates were respectively 165.0 - 192.0 kg·hm^-2, 142.5 - 165.0kg·hm^-2, 120.0 - 142.5 kg·hm^-2 in yellow clayey soil, yellow podzolic sandy land, blue standard lime marl field, whose soil alkali-hydrolyzable nitrogen contents were 105.61 mg·kg^-1, 142.29 mg·kg^-1, 168.37 mg·kg^-1.