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Maize-grain zinc and iron concentrations as influenced by agronomic management and biophysical factors: a meta-analysis

Author

Listed:
  • Job Kihara

    (International Center for Tropical Agriculture (CIAT), ICIPE Duduville Complex)

  • Gudeta W Sileshi

    (Addis Ababa University)

  • Peter Bolo

    (International Center for Tropical Agriculture (CIAT), ICIPE Duduville Complex)

  • Dominic Mutambu

    (International Center for Tropical Agriculture (CIAT), ICIPE Duduville Complex)

  • Kalimuthu Senthilkumar

    (Africa Rice Center (AfricaRice))

  • Andrew Sila

    (International Center for Tropical Agriculture (CIAT), ICIPE Duduville Complex)

  • Mina Devkota

    (International Center for Agricultural Research in the Dry Areas (ICARDA))

  • Kazuki Saito

    (International Rice Research Institute (IRRI))

Abstract

Human Zn and Fe deficiencies can be reduced through agronomic biofortification, but information on factors influencing maize grain-Zn and -Fe levels remain scanty. This analysis: (1) Establishes the global distribution of Zn and Fe concentrations in maize grain; (2) assess the contribution of different agronomic practices to the effectiveness of Zn fertilizers for increasing grain yields, and Zn and Fe levels in maize grain; and (3) identify key biophysical factors and metrics to more effectively guide agronomic biofortification of Zn. Using 5874 data points in 138 published papers from 34 countries, we estimated a 7.5% probability of grain-Zn concentrations exceeding the benchmark target of 38 mg kg−1. Using 3187 data points from 65 studies across 27 countries we estimated a 8.5% probability of grain-Fe concentrations exceeding the target of 60 mg kg−1. Our 70-paper meta-analysis revealed that applying Zn and/or Fe in combination with inorganic NPK fertilizer can increase maize-grain-Zn and-Fe concentrations by 31% (p

Suggested Citation

  • Job Kihara & Gudeta W Sileshi & Peter Bolo & Dominic Mutambu & Kalimuthu Senthilkumar & Andrew Sila & Mina Devkota & Kazuki Saito, 2024. "Maize-grain zinc and iron concentrations as influenced by agronomic management and biophysical factors: a meta-analysis," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 16(5), pages 1147-1173, October.
    • Handle: RePEc:spr:ssefpa:v:16:y:2024:i:5:d:10.1007_s12571-024-01478-5
    DOI: 10.1007/s12571-024-01478-5
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    References listed on IDEAS

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    1. Samuel S. Myers & Antonella Zanobetti & Itai Kloog & Peter Huybers & Andrew D. B. Leakey & Arnold J. Bloom & Eli Carlisle & Lee H. Dietterich & Glenn Fitzgerald & Toshihiro Hasegawa & N. Michele Holbr, 2014. "Increasing CO2 threatens human nutrition," Nature, Nature, vol. 510(7503), pages 139-142, June.
    2. Olaf Erenstein & Moti Jaleta & Kai Sonder & Khondoker Mottaleb & B.M. Prasanna, 2022. "Global maize production, consumption and trade: trends and R&D implications," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 14(5), pages 1295-1319, October.
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