统计分析在烤烟营养评价和推荐施肥中的应用 Ⅰ 直线回归

Application of Statisitics in Evaluation of Nutrition Statues and Recommended Fertilization of Flue cured Tobacco Ⅰ Linear Regression

通过对半叶法得到的有关烤烟烟叶评吸质量和营养元素含量的线性相关分析，发现烟叶烟碱含量太低是导致１９９６年利川烟叶氮碱比和糖碱比严重失调、香吃味较差的主要原因。烟碱含量过低的原因主要同Ｎ和Ｃｕ含量过低，Ｐ和Ｆｅ含量过高有显著线性相关关系，评吸总分与Ｎ和Ｃｕ呈正相关，与烤烟Ｐ和Ｆｅ含量呈负相关。因此，在今后的烤烟生产中，利川应适当增加Ｎ和Ｃｕ的施用，降低Ｐ的施用，采取措施例如适量施用石灰等降低烤烟对铁的吸收。

Linear analysis of the relationship between smoking quality and contents of nutrients,which were evaluated and determined by half leaf method,of flue cured tobacco samples from Lichuan of Hubei Province showed that too low nicotine content was the main reason resulting in the disorders of nitrogen/nicotine ratio and sugar/nicotine ratio and the poorer smoking quality Nicotine content was very significantly positively correlated with nitrogen and copper contents,and very significantly negatively correlated with phosphorus and iron,so was the smoking quality To improve the smoking quality of Lichuan tobacco,it was suggested that nitrogen and copper application amount should be properly increased,phosphorus application should be decreased,and suitable methods such as limestone application should be employed to decrease the uptake of iron in tobacco production of later years