不同留叶数对兴烟一号的影响

为烤烟新品系的推广种植提供科学依据，研究了不同留叶数对兴烟一号的影响。结果表明：随着留叶数的增多，大田生育期变长，留叶数偏少会导致植株过旺，影响叶片和叶形，留叶数对上部叶大小有显著影响，对中下部叶大小无显著影响；赤星病和白粉病在留叶数较少时较轻，留叶数较多时较严重。随着留叶数的增加，上等烟比例、烟叶的产量、产值有增加的趋势。

Effects of Different Retain Leaf Number on Xingyan No. 1

In order to provide scientific basics for extension of new variety of flue--cured tobacco, effects of retain leaf number on Xingyan No. 1 were studied. The results showed that the growth period prolonged with the increase of the retain leaf num- ber; less leaves retaining enhanced the plants growth and effect the shape of leaf, retain leaf number effected the size of upper leaves significantly, while there is no effects on the middle and down leaves; the incidence of ahernaria and powdery mildew disease were declined with less leaf number retaining, but the incidence of alternaria and powdery mildew were increased with the increase of retain leaves. The superior tobacco rate, yield and production of tobacco increased with the increase of retain leaves,