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Enhanced maize yield and nitrogen efficiency with low molecular weight fulvic acid: insights into chlorophyll a/b ratio and nitrogen metabolising enzyme activity

Author

Listed:
  • Fugui Li

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

  • Shujie Zhang

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

  • Longhang Chai

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China
    Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing, P.R. China)

  • Zhiqiang Guo

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

  • Peipei Li

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

  • Yanlai Han

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China
    Co-Construction State Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

  • Yi Wang

    (College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, P.R. China
    Co-Construction State Key Laboratory of Wheat and Maize Crop Science, Henan Agricultural University, Zhengzhou, Henan, P.R. China)

Abstract

This study investigates the impact of various molecular weights (MWs) of fulvic acid (FA) on maize growth, grain yield, and nutrient uptake under different nitrogen levels (NLs). A 2 × 3 balanced design was employed, with high (0.2 g N/kg) and low (0.05 g N/kg) NLs, and three FA MW ranges (W1 ≤ 3 000 D, 3 000 < W2 ≤ 10 000 D, W3 > 10 000 D) were applied at 25 mg/kg in soil. Significant interactions between NLs and FA MWs were observed in chlorophyll a/b ratio, nitrate reductase and glutamate dehydrogenase activities, nitrogen content, and nitrogen uptake efficiency. Overall, under different NLs, FA application reduced chlorophyll a/b ratio, increased nitrogen metabolism enzyme activities, promoted maize growth, and thereby improved grain yield and nitrogen fertiliser uptake efficiency. Additionally, the promotion effect of low MW FA on these indicators outweighed that of high MW FA, yet the latter exhibited a more pronounced effect on increasing grain nitrogen concentration. Structural equation model analysis revealed direct effects of chlorophyll content, nitrogen accumulation, nitrogen uptake efficiency, NLs and FA MWs on maize grain yield, with FA MWs negatively impacting yield.

Suggested Citation

  • Fugui Li & Shujie Zhang & Longhang Chai & Zhiqiang Guo & Peipei Li & Yanlai Han & Yi Wang, 2024. "Enhanced maize yield and nitrogen efficiency with low molecular weight fulvic acid: insights into chlorophyll a/b ratio and nitrogen metabolising enzyme activity," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(10), pages 632-643.
    • Handle: RePEc:caa:jnlpse:v:70:y:2024:i:10:id:320-2024-pse
    DOI: 10.17221/320/2024-PSE
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    References listed on IDEAS

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    1. Yuanyuan Liang & Zeping Wang & Qiuzhe Shi & Fang Li & Zunkang Zhao & Yanlai Han & Yi Wang, 2023. "The varying promotion effects of fulvic acid with different molecular weights on the enhancement of grain yield and quality of winter wheat," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 69(4), pages 141-151.
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