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dc:title "HTML Summary of #11547 \n\nSpatial prediction of the concentration of selenium (Se) in grain across part of Amhara Region, Ethiopia\n\n";
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bibo:abstract "Grain and soilwere sampled across a large part of Amhara, Ethiopia in a study motivated by prior evidence of selenium\r\n(Se) deficiency in the Region's population. The grain samples (teff, Eragrostis tef, and wheat, Triticum\r\naestivum) were analysed for concentration of Se and the soils were analysed for various properties, including\r\nSe concentration measured in different extractants. Predictive models for concentration of Se in the respective\r\ngrainswere developed, and the predicted values, alongwith observed concentrations in the two grainswere represented\r\nby a multivariate linear mixed model in which selected covariates, derived from remote sensor observations\r\nand a digital elevation model, were included as fixed effects. In all modelling steps the selection of predictors was done using false discovery rate control, to avoid over-fitting, and using an α-investment procedure\r\nto maximize the statistical power to detect significant relationships by ordering the tests in a sequence\r\nbased on scientific understanding of the underlying processes likely to control Se concentration in grain. Crossvalidation\r\nindicated that uncertainties in the empirical best linear unbiased predictions of the Se concentration\r\nin both grains were well-characterized by the prediction error variances obtained from the model. The predictions\r\nwere displayed as maps, and their uncertainty was characterized by computing the probability that the\r\ntrue concentration of Se in grain would be such that a standard serving would not provide the recommended\r\ndaily allowance of Se. The spatial variation of grain Se was substantial, concentrations in wheat and teff differed\r\nbut showed the same broad spatial pattern. Such information could be used to target effective interventions to\r\naddress Se deficiency, and the general procedure used for mapping could be applied to other micronutrients\r\nand crops in similar settings."^^xsd:string;
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dct:date "2020-05";
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