Effects of different application rates of nitrogen fertilizer on growth,development and quality of flue-cured tobacco

The effects of different nitrogen fertilizer application rates on growth,development and quality of fluecured tobacco were studied under agro-ecological environment of Hezhou,Guangxi,China.The experimental treatments were consisted of 4 nitrogen fertilizer application rates(105.0,112.5,120.0 and 127.5 kg/ha) with the basal fertilizer dose of P2O5(120 kg / ha) and K2O(360 kg / ha) in a randomized block design.It was observed that the general growth processes of flue-cured tobacco were not significantly affected with nitrogen fertilizer @ 105.0-127.5 kg / ha,but the stem diameter,leaf length and leaf width showed an increasing tendency with the increasing nitrogen rates,and the flue-cured tobacco treated with 105.0 and 112.5 kg / ha nitrogen occurred off-fertilizer after top pruning.Further,the yield of tobacco leaves increased with increasing nitrogen application rate,and the rate of first-class of flue-cured tobacco,average purchase price,output value and smoking quality was found to be the best at 120.0 kg / ha nitrogen fertilization.