不同用量硝酸钾追肥对烤烟产量质量的影响

通过田间试验，研究了不同用量KNO3追肥对烤烟产量质量的影响。结果表明，在一定范围内随着KNO3追肥用量的增加，烟叶的产量、上等烟比例、中上等烟比例、均价、产值都相应地提高，而且总糖、还原糖以及钾含量也相应提高，而烟碱、总氮则相应减少。但在KNO3追肥用量为300kg／hm^2时，产量质量指标有所下降。本试验条件下，追施KNO2 225kg／hm^2对提高烤烟的产量质量性状最为有利。

Effect of different application of topdressing potassium nitrate on yield and quality in flue-cured tobacco

A field trial was conducted to determine the appropriate topdressing amount of KNO3 for flued-cured tobacco. The results showed that the yield and quality of flue-cured tobacco were improved while the topdressing amount of KNO3 was increased from 0 kg/hm^2 to 225 kg/hm^2. When the topdressing amount got to 300 kg/hm^2, the yield, the rate of middle and first class leaf, the average price, the production value and the chemical quality of flue-cured tobacco decreased. The appropriate top-dressing KNO3 amount is very useful to enhance K content and to reduce sugar and total sugar. Under the condition of this experiment, the appropriate top-dressing amount of KNO3 was 225 kg/hm^2.