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

Job Kihara (), Gudeta W Sileshi, Peter Bolo, Dominic Mutambu, Kalimuthu Senthilkumar, Andrew Sila, Mina Devkota and Kazuki Saito
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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)

Food Security: The Science, Sociology and Economics of Food Production and Access to Food, 2024, vol. 16, issue 5, No 6, 1147-1173

Abstract: 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

Keywords: Agronomic biofortification; Dilution effect; Meta-analysis; Nutrition deficiency; Zinc; Iron (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s12571-024-01478-5

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