不同采收成熟度对山东烤烟上部叶烤后烟叶品质的影响OA

To solve the problem of low usability of upper leaves of flue－cured tobacco in Shandong Province and optimize the harvest maturity theory for upper flue－cured tobacco leaves,investigated the effects of different harvest maturity levels on the quality of upper leaves of the cultivar of flue－cured tobacco'KRK26'from Weifang,aiming to establish an appropriate harvest standard,improve the usability of tobacco leaves and increase the income of tobacco farmers.Using upper leaves of flue－cured tobacco'KRK26'from Weifang as experimental materials,three treatments were designed:conventional maturity(T1),10%higher maturity than conventional(T2),and 20%higher maturity than conventional(T3).Standardized cultivation and curing practices were adopted.According to na-tional and industrial standards for tobacco,the appearance quality,routine chemical components,polyphenol contents,and sensory quality of cured tobacco leaves were determined and analyzed.The results showed that maturity had a slight effect on the appearance quality of tobacco leaves;only the T3 group exhibited looser leaf structure and slightly weaker color intensity.In terms of chemical components,the T2 group had the highest contents of total sugar,potassium,polyphenols and other chemical substances,with the best chemical coordination.For sensory quality,the T1 group showed poor aroma quality;the over－high maturity in T3 group led to de-creased aftertaste and irritation strength.The T2 group presented prominent honey－sweet and caramel－like aroma style with the highest comprehensive score.In conclusion,moderately increasing harvest maturity(10%higher than the conventional level)can signifi-cantly improve the chemical coordination and sensory quality of the upper leaves of'KRK26'without negative impacts on appearance quality.This maturity level can be recommended as the appropriate harvest standard for high－quality tobacco production of this cultivar.