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Optimal Nitrogen Rate Increases Water and Nitrogen Use Efficiencies of Maize under Fully Mulched Ridge–Furrow System on the Loess Plateau

Author

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  • Junhong Xie

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China)

  • Linlin Wang

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China)

  • Lingling Li

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China)

  • Sumera Anwar

    (Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54660, Pakistan)

  • Zhuzhu Luo

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Resources and Environment Science, Gansu Agricultural University, Lanzhou 730070, China)

  • Setor Kwami Fudjoe

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China)

  • Haofeng Meng

    (State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
    College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China)

Abstract

Increasing water and nitrogen use efficiencies (i.e., WUE and NUE ) in dryland agroecosystems to maintain high agricultural output with lower environmental costs, such as minimal soil water depletion and nitrate-N residue, are key responsibilities to assure food security for a growing global population. The impact of N rate on soil water balance, soil nitrate N residue, grain yield, WUE , crop N recovery efficiency ( RE N ), agronomic use efficiency of N fertilizer ( AE ), and net economic return were examined on maize production on the rainfed Loess Plateau during 2011–2018. Field treatments included four N application rates (N0, no N fertilizer applied; N100, 100 kg N ha −1 ; N200, 200 kg N ha −1 ; N300, 300 kg N ha −1 ). Results showed that compared with N0, grain yield increased by 56, 110, and 115% under N100, N200, and N300, respectively, with corresponding improvements in net economic return of 5497, 10,878, and 11,088 RMB ha −1 yr − 1 , respectively; no significant difference was detected between N200 and N300. Compared to N0, N fertilization significantly increased WUE through improving photosynthetic WUE (i.e., transpiration efficiency), but there was no significant difference between N200 and N300. Compared to N100, the RE N was gradually decreased as N rates increased, AE was not significantly changed under N200 and significantly decreased under N300 due to a decreased leaf photosynthetic NUE . Compared to original soil water storage at 0–300 cm soil depths, after seven years of continuous experiments, treatment of N0 enhanced soil water storage by 52 mm and treatment of N100 had no effect on soil water storage, but treatments of N200 and N300 depleted soil water storage by 73 and 109 mm, respectively. Our findings showed that 200 kg N ha −1 improves WUE and NUE with less environmental cost and should be regarded as the economically optimal N rate on the semiarid western Loess Plateau of China for sustainable maize production.

Suggested Citation

  • Junhong Xie & Linlin Wang & Lingling Li & Sumera Anwar & Zhuzhu Luo & Setor Kwami Fudjoe & Haofeng Meng, 2022. "Optimal Nitrogen Rate Increases Water and Nitrogen Use Efficiencies of Maize under Fully Mulched Ridge–Furrow System on the Loess Plateau," Agriculture, MDPI, vol. 12(11), pages 1-18, October.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:11:p:1799-:d:957213
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    References listed on IDEAS

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