Effects of Tobacco Stem Biochar on Soil Nutrients,Growth and Development and Chemical Composition in Leaves of Flue-Cured Tobacco

Wei Lezi; Wang Fulei; Yan Ding; Li Peiyan; Li Jianhua; Wang Longfei; Ren Tianbao

doi:10.14083/j.issn.1001-4942.2025.08.016

Abstract：In order to explore the effects of different application amounts of tobacco stem biochar on soil nutrients,growth and development and chemical composition in leaves of flue-cured tobacco,four treatments were set in this experiment as conventional fertilization(CK),and combined application of 1 500 kg·hm-2(T1),3 000 kg·hm-2(T2)and 4 500 kg·hm-2(T3)tobacco stem biochar on the basis of conventional fertili-zation.The physical and chemical properties of soil at different development stages of flue-cured tobacco,the growth of tobacco plants and the quality of flue-cured tobacco leaves were measured under different application amounts of tobacco stem biochar.The results showed that the application of tobacco stem biochar could signifi-cantly promote the growth and development of tobacco plants.At 45 days after transplanting,the contents of soil available phosphorus,alkali-hydrolyzed nitrogen and total nitrogen in T2 treatment increased by 15.09％,8.64％and 20.88％,respectively,compared with CK,and the contents of total sugar,reducing sugar,nico-tine,total nitrogen,potassium and aroma substances significantly increased and the chlorine content signifi-cantly decreased in flue-cured tobacco leaves.However,excessive application would reduce the promotion effect on the growth and dry matter accumulation of tobacco plants,and was not conducive to the coordination of chemical components and aroma quality of flue-cured tobacco leaves.In summary,the physical and chemi-cal indexes of tobacco-planting soil treated with 3 000 kg·hm-2 tobacco stem biochar on the basis of conven-tional fertilization were more coordinated,and the quality and aroma quality of flue-cured tobacco leaves were the best.