期刊
SCIENTIFIC REPORTS
卷 1, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep00072
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资金
- Yara GmbH
- Malawi Government (Ministry of Agriculture Food Security)
- University of Nottingham
- UK Natural Environment Research Council (NERC) [NE/I003347/1]
- UK Department for International Development (DFID) [NE/I003347/1]
- Economic and Social Research Council (ESRC) under the Ecosystems Services for Poverty Alleviation (ESPA) [NE/I003347/1]
- Natural Environment Research Council [NE/I003347/1, bgs05008] Funding Source: researchfish
- NERC [bgs05008, NE/I003347/1] Funding Source: UKRI
Selenium is an essential element in human diets but the risk of suboptimal intake increases where food choices are narrow. Here we show that suboptimal dietary intake (i.e. 20-30 mu g Se person(-1) d(-1)) is widespread in Malawi, based on a spatial integration of Se concentrations of maize (Zea mays L.) grain and soil surveys for 88 field sites, representing 10 primary soil types and >75% of the national land area. The median maize grain Se concentration was 0.019 mu g kg(-1) (range 0.005-0.533), a mean intake of 6.7 mu g Se person(-1) d(-1) from maize flour based on national consumption patterns. Maize grain Se concentration was up to 10-fold higher in crops grown on soils with naturally high pH (>6.5) (Eutric Vertisols). Under these less acidic conditions, Se becomes considerably more available to plants due to the greater solubility of Se-(IV) species and oxidation to Se-(VI).
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