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Soil type influences crop mineral composition in Malawi
Edward J M Joy1, Martin R Broadley2, Scott D Young2
1School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK; Centre for Environmental Geochemistry, Inorganic Chemistry, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
The Science of the Total Environment
|December 3, 2014
Summary
Soil type significantly impacts Malawi
Area of Science:
- Agricultural Science
- Nutritional Science
- Environmental Science
Background:
- Micronutrient intake estimation relies on food composition data.
- Local crop data is crucial for accuracy, accounting for environmental factors like soil type.
- Malawi lacks detailed, spatially resolved crop composition data.
Purpose of the Study:
- To generate spatially resolved crop composition data for Malawi.
- To assess the impact of soil type on essential mineral content in crops.
- To estimate micronutrient deficiency risks based on soil-specific data.
Main Methods:
- Collected 652 plant samples from over 150 sites in Malawi (2011-2013).
- Analyzed samples for up to 58 elements using ICP-MS, focusing on essential minerals.
- Differentiated analysis based on soil types: calcareous and non-calcareous (low-pH).
Main Results:
- Maize and leafy vegetables showed higher concentrations of several minerals (Ca, Cu, Fe, Se) on calcareous soils.
- Leafy vegetables had lower zinc on calcareous soils.
- Moringa leaves were identified as a high selenium accumulator, a novel finding for East Africa.
- Dietary deficiency risks for Ca, Se, and Zn are high on non-calcareous soils, and for Ca on calcareous soils.
Conclusions:
- Soil type is a critical determinant of crop mineral content in Malawi.
- Spatially resolved data reveals significant differences in dietary mineral supply and deficiency risks.
- Findings highlight the need for soil-specific nutritional strategies to address micronutrient deficiencies.
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