为明确种植密度、施氮量和留叶数对烤烟产质量的影响,按L9（34）正交试验设计,将上述三因素各设3个不同水平进行研究。结果表明：密度和留叶数对烤烟农艺性状影响较大;留叶数对中部叶糖类化合物、总氮和蛋白质含量影响较大,密度则主要影响上部叶糖类化合物含量;随着施氮量的增加,烟碱含量呈增加趋势;一定程度上增加留叶数可提高烟叶钾含量;各因子比较,产量、产值和中上等烟比例均在666.7m2密度1 200株、施氮量5.5 kg、每株留叶数21片时达到最大。
To study the effects of planting density,nitrogen rate and number of remained leaves on the yield and quality of flue -cured tobacco,the orthogonal experiment with three factors and three levels was de-signed.The results showed that the planting density and number of remained leaves had a great effect on the flue -cured tobacco agronomic traits.The number of remained leaves had great effects on the content of carbo-hydrate compounds,total nitrogen and protein in the middle leaves.The planting density mainly affected the carbohydrate content in upper leaves.The nicotine content increased with the increase of nitrogen application rate.The potassium content in tobacco leaves was increased at a certain extent by increasing the number of re-mained leaves.The yield,output value and proportion of middle and superior tobacco leaves were the best un-der the optimal combination with the density as 1 200 plants,nitrogen application rate as 5.5 kg and 21 leaves remained per 666.7m2 .
Shandong Agricultural Sciences
Flue -cured tobacco
Number of remained leaves
Yield and quality