不同施氮量对烤烟生长发育及品质的影响

针对广西贺州市特定的生态环境条件,研究了不同施氮量对烤烟生长发育和品质的影响。结果表明,采用105.0～127.5kg/ha纯氮水平,对烤烟大田生育期几乎没有影响,但随着施氮量的增加,茎粗、叶长、叶宽均呈增加趋势,打顶后N（1105.0kg/ha）、N（2112.5kg/ha）处理均出现脱肥现象;烟叶产量随着施氮量的增加而增加,但上等烟比例、收购均价及产值以N（3120.0kg/ha）处理最高,评吸质量也以N3处理最好。

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.