施氮量和留叶数互作对烤烟NC297产量和质量的影响

Effects of nitrogen application and remaining leaves and their interactions on yield and quality of flue-cured tobacco NC297

以促进NC297产量和质量协调和最优化为目的，研究施氮量和留叶数互作对NC297的物理特性、化学成分、经济性状的影响。结果表明：在施氮量7．5—60kg／hm2、留叶数17～26片时，NC297叶长、叶宽、叶面积、叶厚、单叶重均随施氮量的增加而增加；含梗率、叶质重随施氮量的增加先降低后升高；娴碱和总氮含量随着施氮量的增加而上升显著，随着留叶数的增加而显著下降；产量持续上升，产值、均价、中上等烟比例随着施氮量和留叶数的增加先增大后减小；在物理性状、化学成分、经济性状上，除还原糖和糖碱比外，施氮量对其余各指标的影响均最大，留叶数的影响次之，二者交互作用产生的影响最小。NC297的适宜施氮量为30kg／hm2。，适宜留叶数为20～23片。

In order to promoting the coordination and optimization of yield and quality of NC297, the effect of nitrogen application and remained leaves as well as their interaction on physical characteristics, chemical composition and economic characters were studied. It was indicated that leaf length, leaf width, leaf thickness, leaf area and single leaf weight showed the same trend of increasing up with the nitrogen applied in the range of 7.5-60 kg/hm2, while stem rate and dry weight per unit leaf area first decreased and then increased. Nicotine and total nitrogen content significantly increased with increasing nitrogen application and dropped down with the increasing of remained leaves. With the increasing of nitrogen and remained/eaves, the yields of tobacco increased constantly, while the output value, average price, proportion of superior and moderate tobacco first increased and then decreased. Nitrogen application showed the largest impact on indexes concerning physical characteristics, chemical compositions and economic characters aside from reducing sugar and sugar/nicotine ratio, followed by the remained leaves and the interaction between nitrogen application and remained leaves showed the smallest impact. According to the study, the appropriate nitrogen amount and the suitable numbers of remained leaves were 30 kWhm2 and 20-23. resnectivelv.