Departmento de Edafología y Química Agrícola, Universidad de Granada, Granada, Spain.
Departamento de Nutrición y Bromatología, Instituto de Nutrición y Tecnología de los Alimentos, Centro de Investigación Biomédica, Universidad de Granada, Granada, Spain.
Food Chem. 2019 Jun 1;282:1-8. doi: 10.1016/j.foodchem.2018.12.101. Epub 2019 Jan 3.
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.
对分为 5 组的生菜（婴儿品种、在农业土壤中用低或高比例的咖啡渣培养-SCG、无 SCG 和用 NPK 培养）中的元素浓度进行了测量。在农业土壤中添加 SCG 培养的生菜中，几种必需元素（V、Fe、Co、V，可能还有 Mn 和 Zn）和有毒元素（Al 和可能的 As）的含量明显更高，但未达到其毒理学限度。此外，还观察到了对 N 吸收的抑制作用，因此植物生物量以及可能从农业土壤中吸收 Cd。与 NPK 施肥相比，用 SCG 进行有机农业可以改善生菜中的元素浓度。元素吸收与 SCG 施肥之间的线性相关性可能与其被某些 SCG 成分（如类黑素和土壤 pH 值降低）螯合有关。总之，添加 SCG 会使生菜的元素含量更高。
