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

IF 5.6 1区农林科学 Q1 FOOD SCIENCE & TECHNOLOGY Food Security Pub Date : 2024-08-05 DOI:10.1007/s12571-024-01478-5

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

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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 < 0.01) relative to the control (NPK only). In 52% and 37.5% of the studies respectively, grain-Zn and -Fe levels showed significant and concomitant increase with grain-yield increases. Soil organic matter, pH, soil-available Zn, organic input applications, and N, Zn and Fe application rates and methods were among the key factors influencing grain Zn and Fe. We conclude there is substantial room for increasing maize-grain Zn and Fe concentrations, and applying Zn, especially in combined soil and foliar applications, gives substantial increases in grain-Zn and -Fe concentrations. This global review reveals large data gaps on maize-grain nutrient levels, and we call for routine collection of such information in future research.

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受农艺管理和生物物理因素影响的玉米籽粒锌和铁浓度：一项荟萃分析

人类的锌和铁缺乏症可通过农艺生物强化来缓解，但有关影响玉米籽粒中锌和铁含量的因素的信息仍然很少。这项分析：(1) 确定玉米籽粒中锌和铁浓度的全球分布；(2) 评估不同农艺措施对锌肥提高籽粒产量的效果以及玉米籽粒中锌和铁含量的贡献；(3) 确定关键的生物物理因素和衡量标准，以便更有效地指导锌的农艺生物强化。利用 34 个国家 138 篇已发表论文中的 5874 个数据点，我们估计谷物中锌浓度超过 38 毫克/千克基准目标的概率为 7.5%。利用来自 27 个国家 65 项研究的 3187 个数据点，我们估计谷物中铁的浓度超过 60 毫克/千克目标值的概率为 8.5%。我们对 70 篇论文进行的荟萃分析表明，锌和/或铁与无机氮磷钾肥料结合施用可使玉米籽粒中的锌和铁浓度比对照组（仅施用氮磷钾肥料）提高 31% (p < 0.01)。分别有 52% 和 37.5% 的研究表明，谷物锌和铁的含量随着谷物产量的增加而显著增加。土壤有机质、pH 值、土壤中可利用的锌、有机投入的施用以及氮、锌和铁的施用率和施用方法是影响谷物锌和铁的关键因素。我们得出的结论是，玉米籽粒中的锌和铁浓度还有很大的提高空间，施用锌，尤其是土壤和叶面联合施用锌，可大幅提高籽粒中的锌和铁浓度。这次全球综述揭示了有关玉米籽粒养分水平的巨大数据缺口，我们呼吁在今后的研究中例行收集此类信息。

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来源期刊

Food Security FOOD SCIENCE & TECHNOLOGY-

CiteScore

14.00

自引率

6.00%

发文量

审稿时长

>12 weeks

期刊介绍： Food Security is a wide audience, interdisciplinary, international journal dedicated to the procurement, access (economic and physical), and quality of food, in all its dimensions. Scales range from the individual to communities, and to the world food system. We strive to publish high-quality scientific articles, where quality includes, but is not limited to, the quality and clarity of text, and the validity of methods and approaches. Food Security is the initiative of a distinguished international group of scientists from different disciplines who hold a deep concern for the challenge of global food security, together with a vision of the power of shared knowledge as a means of meeting that challenge. To address the challenge of global food security, the journal seeks to address the constraints - physical, biological and socio-economic - which not only limit food production but also the ability of people to access a healthy diet. From this perspective, the journal covers the following areas: Global food needs: the mismatch between population and the ability to provide adequate nutrition Global food potential and global food production Natural constraints to satisfying global food needs: § Climate, climate variability, and climate change § Desertification and flooding § Natural disasters § Soils, soil quality and threats to soils, edaphic and other abiotic constraints to production § Biotic constraints to production, pathogens, pests, and weeds in their effects on sustainable production The sociological contexts of food production, access, quality, and consumption. Nutrition, food quality and food safety. Socio-political factors that impinge on the ability to satisfy global food needs: § Land, agricultural and food policy § International relations and trade § Access to food § Financial policy § Wars and ethnic unrest Research policies and priorities to ensure food security in its various dimensions.