种植密度对津巴布韦引进品种KRK26烟叶产量质量和化学成分的影响

摘要

In order lo aelect a best suitable planting density for KRK26 introduced from Zimbabwe , one field plot experiment consiating of 5 planting density treatments ( line space 120cm; plant npace 45 , 50 , 55 , 60 , 65 cm) was carried out , and then tobacco growing status, leaf yield and valve, leaf charactenatics after curing were investigated and chemical components content in leaf were detected. Resulta showed that tobacco plant grown faster under higher phuting density treatment 120 cm × 45 - 50 cm than 120 cm × 60 - 65 cm on the later vegetative growing period ( 60 daya after transplanting) . Higher planting density contributed to increasing in tobacco leaf yield , but leaf walue did not increase correspondingly. As for chemical components content in tobacco leaf, the content of carbohydrates ( total sugar, reducing sugar and 8tarch) , ratio of total augar and nicotine , total nitrogen and nicotine increased as plant denaity declined. The difference in cantents between total sugar and reducing sugsr, total nitrogen , nicotine , petroleum ether extraction . volatile acid and volatile bases decreased as plant density declined. The changinS rule of polyphenola and K contenta with plant denaity was not unobvious. Therefore. the planting density for KRK26 in Yuxi area should be controlled in the range from 120 cm × 55 - 60 cm%为了筛选出津巴布韦引进烤烟品种KRK26的最佳种植密度,在田间设置了5个植烟密度(固定行距为120 cm,株距分别为45、50、55、60和65 cm)处理的小区试验,比较分析了不同处理间烟株生长状况、烟叶产量产值、烤后烟叶性状和烟叶化学成分.结果表明,在营养生长后期(移栽60 d后),高植烟密度处理120 cm×45～50 cm的烟株生长快于低植烟密度处理120 cm×60～65cm;植烟密度增大有利于烟叶产量的增加,但不利于烟叶产值的提高;叶片中的糖类物质(总糖、还原糖和淀粉)含量、糖碱比和氮碱比均随植烟密度的降低而增大,两糖差、总氮、烟碱、石油醚提取物、挥发酸和挥发碱含量则随植烟密度的降低而降低,多酚和钾含量随植烟密度的改变变化规律不明显.综合以上结果,KRK26在玉溪地区的种植密度应控制在120 cm×55～60 cm或13 889～15 152株/hm2为好.