Effects of Planting Density and K Application Level on Qulity of Flue-cured Tobacco

In this paper,taken Liaoyan 17 as tested materials,the effects of planting density and K application level on the quality of flue-cured tobacco were studied by using split plot design.The result showed that the POD activity,potassium content,nicotine content,chlorine content,content of aroma components in flue-cured tobacco leaf were subsequently added with the increase of the amount of potash fertilizer in different degrees 80 days after planting,but the amount of potassium fertilizer was too high,the nicotine content would be lower.With the increase of planting density,single-leaf weight,potassium content,chlorine content,browning reaction products and the total amount of aroma components were added in different degrees,but the planting density was too high,the total neutral aroma components would reduce.Treatment A2B2(1.2 m×0.55 m,1000 plants /667m2;potassium fertilizer application dosage:7.23 kg/667m2) had high nicotine content,got the coordination of chemical composition and attained sufficient content of aroma substances.Tobacco planting density with space to 1.2 m× 0.55 m,potash fertilizer application dosage:7.23 kg / 667m2 had the best effect on improving quality of flue-cured tobacco.