Effect of Nitrogen Application Combined with Potassium on Growth and Yield Quality of Xiangyan No.7

GOU Zheng-gui; WANG Cong; CHEN Kun-kun; GAO Zhi-hao; XIANG Dong; XING Yun-fei; CHENG Zhi-jun; YI Ke; FENG Xin-wei; PENG Yu-qing; YAN Ruo-song; LI Qiang

doi:10.13651/j.cnki.fjnykj.2025.08.005

Abstract：In order to clarify the law of nitrogen and potassium fertilization of flue-cured tobacco in Weng'an tobacco-growing area,Xiangyan No.7 was used as the test material,and the amount of nitrogen fertilizer and potassium fertilizer were used as the two-factor variables to explore the effects of different nitrogen and potassium fertilizer treatments on the yield and quality of flue-cured tobacco.At the same time,the fuzzy comprehensive evaluation method was used to comprehensively evaluate the appearance quality,physical index,chemical composition and smoking quality of Xiangyan No.7 tobacco leaves under different nitrogen and potassium application,in order to provide reference for the application of nitrogen and potassium fertilizer in Weng'an tobacco production area.The results showed that the quality index of flue-cured tobacco under N3 treatment was higher than that under other treatments.In terms of agronomic traits and economic traits,the high-nitrogen treatment significantly increased the plant height,maximum leaf length,maximum width of blade and the proportion of premium-grade tobacco leaves under different potassium application rates.In terms of appearance quality,the appearance quality index increased with the increase of nitrogen fertilizer content under high-nitrogen treatment,with N3K3 achieving the highest score(80).In terms of chemical composition,the chemical composition usability index of N1K2,N3K2,and N3K3 was higher.In conclusion,the fertilization scheme of applying an additional 15 kg·hm-2 pure nitrogen combined with 20%K2O(N3K3)in Weng'an tobacco-growing areas could improve the agronomic traits of flue-cured tobacco at budding stage,optimize the indicators of economic traits,and obtain the highest appearance quality score,higher physical characteristics score and the most coordinated chemical composition,which had the best effect on improving the economic traits and quality of flue-cured tobacco.