关键词: 烤烟, 钾肥, 糖碱比, 有机钾指数, 中性致香物质

Abstract:

In order to explore the effects of topdressing different potassium fertilizer on tobacco quality traits, by combining field experiment with laboratory analysis, and taking ‘Zhongyan 100’ as material, this paper studied the effects of topdressing different potassium fertilizer on the contents of chemical components, organic potassium index and neutral aroma constituents in flue-cured tobacco. The results showed that topdressing potassium fertilizer could improve the leaf quality of flue-cured tobacco. The effectiveness of topdressing potassium citrate fertilizer was the best, the routine application of topdressing potassium fertilizer plus biological potassium fertilizer was the second, but routine topdressing potassium fertilizer plus organic potassium fertilizer had a poor effect, similar to the conventional fertilizer. The topdressing potassium citrate fertilizer treatment and the routine application of potassium fertilizer and biological fertilizer treatment could effectively coordinate the ratio of total sugar to nicotine in upper flue-cured tobacco leaves, and obviously enhance the organic potassium index of all parts of tobacco leaves, and increase the content of aroma components of middle part of flue-cured tobacco leaves. Generally, topdressing potassium citrate fertilizer or adding more organic potassium fertilizer could effectively improve the quality of tobacco leaves. To certain extent, topdressing organic potassium fertilizer could instead the expensive potassium citrate fertilizer to improve the leaf quality of flue-cured tobacco.

Key words: flue-cured tobacco, potassium fertilizer, ratio of total sugar to nicotine, organic potassium index, neutral aroma