钾肥追施时期对山地烤烟烟叶质量的影响

摘要

The effects of potassium application at different growth stages on soil potassium content,chemical components,neutral aroma components and sensory smoking quality of cured tobacco leaves to improve potassium utilization rate and increase the content of potassium and neutral aroma components of flue-cured tobacco in mountainous area.Results:The variation of total potassium and rapid available potassium content in soil is the same basically among four applying potassium treatments,and total potassium and rapid available potassium content in soil changes with K2SO4 application time.The potassium and neutral aroma components content of flue-cured tobacco with middle and upper parts increases with backward of K2SO4 application time to some extent.The smoking score of cured tobacco leaves with the middle part is the highest when the flue-cured tobacco seedlings are applied with 20 kg/ 667m2 K2SO4on 40thday after transplanting.The neutral aroma components content of cured tobacco leaves under applying 20 kg/667m2 K2SO4on 40thday after transplanting is 27.49％,22.13％ and 14.01％ higher than CK (no potassium application),Treatment Ⅰ (applying 20 kg/667m2 K2SO4 on 20th day after transplanting) and Treatment Ⅱ (applying 20 kg/667 m2 K2SO4 on 30th day after transplanting) respectively.%为提高钾肥利用率,增加山地烤烟钾含量及其中性致香物质含量,采用田间试验的方法,进行不同时期追施钾肥试验,比较各生育期土壤钾含量及烤后烟叶化学成分、中性致香物质和感官评吸质量.结果表明:土壤中全钾及速效钾含量变化基本一致,均随追施K2SO4的时间而相应变化;随着钾肥追施时间的后移,烤烟中上部烟叶钾含量、中性致香物质含量等均有所提高,以移栽后40 d追施硫酸钾20 kg/667m2的效果最好,烤后中部烟叶评吸得分最高,中性致香物质总量分别比不追施钾肥、移栽后20 d和30 d追施钾肥分别高27.49％、22.13％和14.01％.