Effects of Different Growth-Promoting Fungal Fertilizers on Aroma Components,Sensory Quality and Soil Properties of Flue-cured Tobacco
With Yunyan 87 as the test material,a field cultivation experiment was set up,and on the basis of conventional fertilization(CK),symbiotic Richoderma harzianum(Rh),internal and external symbiotic Funneliformis mosseae(Fm),endophytic Beauveria bassiana(Bb)and their combined treatments(RF,RB,FB,RFB)were applied to explore the effects of different growth-promoting fungi on aroma components,sensory quality and soil properties of flue-cured tobacco,to provide some reference for the application of growth-promoting fungal fertilizer in flue-cured tobacco production.The results showed that the inoculation and combined application of different growth-promoting fungi had positive effects on the total amount of non-volatile organic acids,neutral aroma components,sensory quality and soil properties of flue-cured tobacco.Compared with CK,the soil microbial respiration rate of related inoculation treatments(Rh,Fm,Bb,RF,RB,FB,RFB)was significantly increased by 87.93%—186.21%,and other soil indexes(the content of alkaline hydrolysis nitrogen,available phosphorus,available potassium,exchangeable calcium,exchangeable magnesium and exchangeable iron)were better in multi-inoculation treatments(RF,RB,FB,RFB).The contents of non-volatile organic acids(succinic acid,fumaric acid,oxalic acid,citric acid,malic acid)and neutral aroma components(aromatic amino acids,browning products,plastid pigments,cembranoids)were higher in multi-inoculation treatments(RF,FB,RFB)containing Funneliformis mosseae.In the sensory quality,the difference of the total score of each treatment was small,but the aroma quality,aroma quantity,strength and flammability of the inoculated treatments were better.Furthermore,correlation analysis showed that soil exchangeable calcium,magnesium,iron contents were closely related to aroma components and sensory quality of flue-cured tobacco.Principal component analysis showed that FB treament was the most conducive to improving the total amount of non-volatile organic acids,neutral aroma components and sensory quality.In summary,the combination of Funneliformis mosseae and Beauveria bassiana was the best treatment,which could improve the quality of flue-cured tobacco by promoting soil ion exchange performance.
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