Effects of Plant Population and K Application Level on the Quality of Leaves of Flue-cured Tobacco

Effects of tobacco planting density and potassium fertilizer application dosage on the quality of flue-cured tobacco leaf were studied in this paper.The results indicated that when potassium fertilizer application dosage was increased from 247.5 to 341.25 kg/hm2,contents of potassium,total nitrogen,nicotine and protein in different parts of tobacco leaves increased,while reducing sugar and total sugar decreased,and chemical components proportion of tobacco leaves became suitable.However,potassium fertilizer application dosage got to 390 kg/hm2,quality of tobacco leaves decreased.It was also found Increase of tobacco planting density result in contents of potassium,reducing sugar and total sugar increased; on the other hand,total nitrogen,nicotine and protein decreased;in the end,chemical composition of tobacco leaf harmonized better.The best combinations was tobacco planting density of 1.1 m(row spacing) 0.5 m(plant spacing) together with potassium fertilizer application dosage of 292.5-341.25 kg/hm2.