Journal
FOOD CHEMISTRY
Volume 282, Issue -, Pages 1-8Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.12.101
Keywords
Spent coffee grounds; Organic amendment; Lettuce; Essential elements; Toxic elements; Biofortification
Funding
- Spanish Ministry of Economy and Competitiveness [AGL2014-53895-R]
- European Regional Development Fund (FEDER)
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The element concentration in lettuces grouped in 5 categories (baby variety, cultivated in agricultural soils with low or high percentages of spent coffee grounds-SCG, without SCG and with NPK) were measured. Lettuces cultivated in agricultural soils amended with SCG had significantly higher levels of several essential (V, Fe, Co, V, and probably Mn and Zn) and toxic elements (Al and probably As), without reaching their toxicological limits. Additionally, blocking of N uptake and therefore plant biomass, and probably Cd absorption from agricultural soil was observed. Organic farming with SCG ameliorates element concentrations in lettuces vs. NPK fertilization. The linear correlations among element uptake and the amendment of SCG could be related with their chelation by some SCG components, such as melanoidins and with the decrease in the soil pH. In conclusion, the addition of SCG produces lettuces with higher element content.
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