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Multi-split nitrogen application via drip irrigation improved dry matter accumulation, nitrogen uptake and utilization efficiency in flue-cured tobacco

文献类型： 外文期刊

作者： Khan, Abdullah 1 ; Peng, Chuanxi 1 ; Chen, Keling 1 ; Ma, Xinghua 1 ;

作者机构： 1.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Tobacco Biol & Proc, Tobacco Res Inst, Qingdao 266101, Peoples R China

关键词： Nicotiana tabacum L.; Nitrogen management; Mineral deficiency stress; Split application; Plant growth; Nitrogen use efficiency (NUE)

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1471-2229

年卷期： 2025 年 25 卷 1 期

页码：

收录情况： SCI

摘要： Purpose Flue-cured tobacco (Nicotiana tabacum L.), a key economic crop in China, is highly dependent on nitrogen (N) management. This study evaluated the effects of multi-split N application via drip irrigation on tobacco growth, N accumulation, and nitrogen use efficiency (NUE). Methods A randomized experiment was conducted with 10 treatments (T0-T9) in K326 tobacco grown in nutrient-rich brown soil. The treatments differed in terms of N application timing and proportions. Results T2 and T3, which applied N twice post-transplant, led to the highest dry weight accumulation in roots, stems, and leaves, with T3 resulting in a 65.8% increase in root dry weight over that of T6. N accumulation followed the order of leaves > stems > roots, with T1 resulting in the highest total N accumulation, a 1.77-fold significant increase compared with that in T0 (p < 0.05). The fertilizer nitrogen (FN) was highest at T1 and T2, reaching nearly 46%, whereas T9 presented the lowest FN, decreasing by 22% compared with that at T1. T1 also retained the most N in the soil, whereas T3 had the highest N residues after the first top dressing. Uneven N applications resulted in significantly lower biomass and NUE. Conclusions These results highlight the importance of balanced multi-split N applications (T2 and T3) in improving dry matter accumulation, NUE, and crop quality. Optimizing N application through drip irrigation offers a promising approach to improving both yield and N management efficiency in flue-cured tobacco cultivation.

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