A plot experiment was conducted in the early planting tobacco area to research the appropriate nitrogen fertilizer rate for Hongda variety.The results showed that different nitrogen fertilizer rates had significant influences on growth and effect of yield and quality of flue-cured tobacco;in the early planting tobacco area of Longling County,a river valley with low temperature on Longchuan River,applying the pure nitrogen with fertilizer rate of 60~75 kg/hm2 to the tobacco plants,the tobacco plants had the ...