Abstract: To investigate the effects of sugar derivatives application combined with potassium fertilizer on oil‑related indicators in upper tobacco leaves，Zhongyan 100 was used as the experimental material in a field trial. Spraying clear water served as the control（CK），with five additional treatments set as follows：spraying chitosan oligosaccharide（1.2 g/L，T1），glucosamine hydrochloride（1.5 g/L，T2），sugar alcohol chelated potassium fertilizer（600‑fold dilution，T3），chitosan oligosaccharide（1.2 g/L）+ sugar alcohol chelated potassium fertilizer（600‑fold dilution）（T4），glucosamine hydrochloride（1.5 g/L） + sugar alcohol chelated potassium fertilizer（600‑fold dilution）（T5）.Spraying was conducted every 10 days after topping，totaling three applications.Samples were collected to measure photosynthetic characteristics，oil‑related indicators，conventional chemical components，aroma compounds，and economic traits of the upper leaves of flue‑cured tobacco after application. Results indicated that co‑application of sugar derivatives with sugar alcohol chelated potassium fertilizer promoted photosynthesis and carbon‑nitrogen metabolism in upper tobacco leaves，with T4 treatment yielding the best effects. Compared to CK，photosynthetic rate and the activities of nitrate reductase，glutamine synthetase，sucrose synthase，and sucrase were significantly increased by 25.62%，28.01%，13.14%，24.44%，and 10.57%，respectively.Regarding oil content，the combined application of sugar alcohol chelated potassium fertilizer significantly increased the density，length，and secretion levels of glandular trichomes in the upper leaves of flue‑cured tobacco，with the T4 treatment showing the most pronounced effect.The content of α‑cembratriene‑diol and β‑cembratriene‑diol increased by 18.93% and 41.08%，respectively，compared to CK.Pyruvate and petroleum ether extract contents increased by 19.60% and 30.85%，respectively，compared to CK. In terms of conventional chemical composition，the treatment with sugar derivatives combined with sugar alcohol chelated potassium fertilizer resulted in higher levels of reducing sugars and total sugars and potassium in tobacco upper leaves. Specifically，the T4 treatment showed 21.38% increase in potassium content compared to CK.The total neutral aroma compounds in the upper leaves of flue‑cured tobacco treated with T4 and T5 increased by 26.88% and 19.78%，respectively，compared to CK.In terms of economic traits，the T4 treatment yielded the highest upper leaf production and value，reaching 1 105.41 kg/ha and 33 309.59 Yuan/ha respectively.These figures represented significant increases of 7.24% and 21.03% compared to CK.The proportion of premium‑grade tobacco rose to 49.27%，with an average price 12.85% higher than that of CK.In summary，the application of sugar derivatives in combination with sugar alcohol chelated potassium fertilizer promotes the growth and development of upper tobacco leaves，regulates carbon and nitrogen metabolism，balances the chemical composition of tobacco leaves，and increases the oil content and neutral aromatic compounds content in upper leaves.Among these，the combination of chitosan oligosaccharide with sugar alcohol chelated potassium fertilizer yields superior results.

Key words: Flue?cured tobacco, Carbohydrate derivatives, Sugar alcohol chelated potassium fertilizer, Oil content, Quality

摘要： 为探究糖类衍生物配施钾肥对烤烟上部叶油分相关指标的影响，以中烟100为试验材料，采用田间试验，以喷施清水为对照（CK），设置喷施壳寡糖（1.2 g/L，T1）、氨基葡萄糖盐酸盐（1.5 g/L，T2）、糖醇螯合钾肥（稀释600倍，T3）、壳寡糖（1.2 g/L）+糖醇螯合钾肥（稀释600倍）（T4）、氨基葡萄糖盐酸盐（1.5 g/L）+糖醇螯合钾肥（稀释600倍）（T5）5个处理，于打顶后每隔10 d喷施1次，共喷施3次，取样测定喷施后烤烟上部叶的光合特性、油分相关指标、常规化学成分、香气成分和经济性状等。结果表明，糖类衍生物配施糖醇螯合钾肥可以促进烤烟上部叶的光合作用和碳氮代谢，且以T4处理效果最好，光合速率和硝酸还原酶、谷氨酰胺合成酶、蔗糖合成酶、蔗糖酶活性较CK分别显著提高25.62%和28.01%、13.14%、24.44%、10.57%。在油分方面，糖类衍生物配施糖醇螯合钾肥处理烤烟上部叶腺毛密度、长度以及分泌物含量均明显增加，尤以T4处理增加更为显著，α-西柏三烯二醇和b-西柏三烯二醇含量较CK分别提高18.93%和41.08%，丙酮酸和石油醚提取物含量较CK分别增加19.60%和30.85%。常规化学成分上，糖类衍生物配施糖醇螯合钾肥处理烤烟上部叶的还原糖、总糖、钾含量均较高，其中T4处理钾含量较CK提高21.38%。T4和T5处理烤烟上部叶中性致香物质总量较CK分别提高26.88%和19.78%。在经济性状方面，T4处理的烤烟上部叶产量和产值最高，分别达1 105.41 kg/hm²、33 309.59元/hm²，分别较CK显著提高7.24%、21.03%；上等烟比例提高至49.27%，均价较CK提高12.85%。综上所述，糖类衍生物配施糖醇螯合钾肥可以促进烤烟上部烟叶生长发育、调节碳氮代谢、协调烟叶化学成分、提高上部烟叶油分和中性致香物质含量等，其中以壳寡糖配施糖醇螯合钾肥的效果更好。

关键词: 烤烟, 糖类衍生物, 糖醇螯合钾肥, 油分, 品质