Effects of Different Varieties,Nitrogen Rate and Planting Density on Grow th,Economic Characters and Chemical Quality of Flue-cured Tobacco

FAN Yi-kuan; MAO Jia-wei; YE Hong-chao

doi:10.3969/j.issn.1004-3268.2013.12.012

Abstract：Using orthogonal experimental design for the field experiment ,the effects of different varieties ,nitrogen rate and planting density on grow th ,economic characters and chemical quality of flue-cured tobacco were studied in the west of Henan region to find the suitable cultivars and optimum nitrogen rate and planting density .The results showed that on the 35th day after trans-planting ,the plant height of Zhongyan 100 was highest among the 3 varieties and the plant height ,stem girth ,leaf number and leaf area had no significant difference among different planting density .On the 60th day after transplanting ,the leaf area was increased with the increase of nitro-gen rate .The research indicated the influence of experimental factors on tobacco yield was ranked as follows :variety > nitrogen rate > planting density .Under this experiment condition ,the cultivation technique for the highest yield was A3 B3 C3 (variety :Yuyan 6 ,planting density :18 000 plants/ha ,nitrogen rate :90 .0 kg/ha) .The order of experimental factors influencing on tobacco output was variety>planting density>nitrogen rate and the cultivation technique for the highest tobacco out-put was A1B2C2 (variety :Qinyan 96 ,planting density :16 500 plants/ha ,nitrogen rate :67 .5 kg/ha) .The corresponding output value ,average price and high grade leaf proportion were 62 770.5 yuan/ha ,19 .21 yuan/kg and 58 .6% ,respectively .Compared with the other factors ,total sugar and reducing sugar were affected mostly by variety .And with the increase of nitrogen rate , the total nitrogen increased .Comprehensive comparisons suggested that the variety of Qinyan 96 , planting density at 16 500 plants/ha and the application level of nitrogen rate at 67 .5 kg/ha were suitable in tobacco-growing region of western Henan .