Effects of Different Nitrogen Application Rates on Growth and Development and Quality of Daning Sun-Cured Tobacco
Tian Mengqiang
Yu Jinheng
Qi Shiqing
Wang Weifeng
Yang Mengquan
Yin Quanyu
Zhang Deping
Abstract：To explore the suitable nitrogen application rate for non-origin cultivation of Daning sun-cured tobacco,a randomized block experiment was conducted by setting four nitrogen levels as 82.5 kg/hm2(N1),105.0 kg/hm2(N2),127.5 kg/hm2(N3)and 150.0 kg/hm2(N4),respectively.The effects of different nitro-gen application rates on the growth,development and quality of Daning sun-cured tobacco were studied.The results showed that as the nitrogen application rate increased,the tobacco plant height gradually increased,the stem diameter gradually became larger,the leaves gradually became larger,and the accumulation of dry matter in roots,stems and leaves also gradually increased.When the application rate of nitrogen was 82.5 to 127.5 kg/hm2,the black shank was gradually aggravated.When the nitrogen application rate was 105 kg/hm2,the incidence rate and disease index of mosaic were lower than those of the other treatments.When the nitrogen application rate exceeded 105 kg/hm2,the ratio of reducing sugar to total sugar,ratio of total sugar to nico-tine,and ratio of total nitrogen to nicotine of sun-cured tobacco leaves decreased obviously,and the coordina-tion of chemical components reduced significantly.In conclusion,optimizing nitrogen application rate could ef-fectively improve the agronomic traits and dry matter accumulation of Daning sun-cured tobacco.When the ni-trogen application rate was 105 kg/hm2,the comprehensive performance of Daning sun-cured tobacco plants was the best in growth and development,dry matter accumulation,resistance to diseases and coordination of chemical components.
Keywords：Daning sun-cured tobaccoNitrogen application rateAgronomic traitsDry matter accumu-lationChemical components
Publication Date：2025-06-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 95-99 )