Acta Agriculturae Boreali-Sinica ›› 2026, Vol. 41 ›› Issue (1): 122-133. doi: 10.7668/hbnxb.20195894

Special Issue: Tobacco Soil fertilizer

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Synergistic Regulation of Optimizing the Basal-to-Topdressing Ratio and Reducing Nitrogen Application on Key Nitrogen Metabolism Enzyme Activities and Nitrogen Use Efficiency in Flue-Cured Tobacco

YANG Ziyue1, ZHANG Songlin1, CHEN Chen2, XIE Hao2, ZHANG Haixia2, LIU Yanfeng2, GUO Hongyan3, LI Huaiyuan4, HUANG Yuepeng3, DENG Shiyuan1   

  1. 1 College of Agriculture,South China Agricultural University,Guangzhou 510642,China
    2 Ruyuan County Branch of Guangdong Tobacco Shaoguan Co.,Ltd.,Ruyuan 512700,China
    3 Guangdong Tobacco Shaoguan Co.,Ltd.,Shaoguan 512000,China
    4 Center for Basic Experiments and Practice Training,South China Agricultural University,Guangzhou 510642,China
  • Received:2025-06-03 Published:2026-03-10

Abstract:

To investigate the effects of optimizing basal-to-topdressing ratios combined with nitrogen application rates on nitrogen metabolism and nitrogen uptake/utilization in flue-cured tobacco,a field experiment was conducted using the cultivar Yueyan 97.Five treatments were designed:conventional basal-to-topdressing ratio (6∶4)+conventional nitrogen rate (CK),basal-to-topdressing ratio (4∶6)+conventional nitrogen rate (T1),basal-to-topdressing ratio (4∶6)+10% nitrogen reduction (T2),basal-to-topdressing ratio (4∶6)+20% nitrogen reduction (T3),and basal-to-topdressing ratio (4∶6)+30% nitrogen reduction (T4).It analyzed the impacts of these treatments on nitrogen metabolism,photosynthetic characteristics,dry matter accumulation,nitrogen uptake,nitrogen use efficiency,and nitrogen balance.The results showed that after optimizing the basal-to-topdressing ratio to 4∶6,the activities of key nitrogen metabolism enzymes,including glutamate dehydrogenase (GDH),aspartate transaminase (AST),and ferredoxin-glutamate synthase (Fd-GOGAT),were all higher than those under the traditional basal-to-topdressing ratio of 6∶4.When combined with nitrogen reduction treatments,the activities of nitrogen metabolism enzymes decreased.Specifically,T2 (10% nitrogen reduction) showed no significant difference from CK,while T3 and T4 (20%—30% nitrogen reduction) exhibited marked declines in enzyme activity.Optimizing the basal-to-topdressing ratio to 4∶6 also improved photosynthetic rate,SPAD values,dry matter accumulation,and nitrogen accumulation,with significant differences observed during the late growth stages.Furthermore,the optimizing 4∶6 ratio significantly enhanced nitrogen use efficiency.Compared to CK,nitrogen agronomic efficiency,partial factor productivity,recovery efficiency,and economic utilization efficiency increased by 20.68%,6.89%,4.06 percentage points,and 3.78 percentage points,respectively.Nitrogen reduction treatments reduced soil nitrogen surplus by 17.04—33.36 percentage points compared to CK.In conclusion,optimizing the basal-to-topdressing ratio from 6∶4 to 4∶6 in southern tobacco-growing regions enhances nitrogen metabolism during mid-to-late growth stages,improved photosynthetic performance,promotes dry matter and nitrogen accumulation,and increased nitrogen use efficiency.Coupled with 10% reduction in fertilizer can also reduce fertilizer input,mitigetes soil nitrogen surplus,and prevent environmental risks.

Key words: Flue-cured tobacco, Basal-to-topdressing ratio, Nitrogen reduction, Nitrogen metabolism, Nitrogen use efficiency, Nitrogen balance

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Cite this article

YANG Ziyue, ZHANG Songlin, CHEN Chen, XIE Hao, ZHANG Haixia, LIU Yanfeng, GUO Hongyan, LI Huaiyuan, HUANG Yuepeng, DENG Shiyuan. Synergistic Regulation of Optimizing the Basal-to-Topdressing Ratio and Reducing Nitrogen Application on Key Nitrogen Metabolism Enzyme Activities and Nitrogen Use Efficiency in Flue-Cured Tobacco[J]. Acta Agriculturae Boreali-Sinica, 2026, 41(1): 122-133. doi: 10.7668/hbnxb.20195894.

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