期刊
CHEMOSPHERE
卷 281, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130767
关键词
Biofortification; Green beans; Resource recovery; Se-enriched biomaterials; Selenium bioavailability
资金
- Special Research Fund (BOF) from Ghent University [BOFCHN2017000801]
- Chinese Scholarship Council (CSC) [201606300023]
- FWO [12Q7718 N]
- Government of Catalonia (Consolidated Research Group) [2017 SGR 1029]
Selenium plays a vital role in plant growth, with selenium-enriched sludge identified as a potential slow-release selenium biofertilizer to increase selenium content in bean plants. The study showed that selenium released from selenium-enriched sludge could be efficiently transformed into health-beneficial selenoamino acids when taken up by bean plants.
Selenium (Se) is an essential trace element for humans and animals with a narrow window between deficiency and toxicity levels. Application of conventional chemical Se fertilizers to increase the Se content of crops in Se deficient areas could result in environmental contamination due to the fast leaching of inorganic Se. Slow-release Se-enriched biofertilizers produced from wastewater treatment may therefore be beneficial. In this study, the potential of Se-enriched biomaterials (sludge and duckweed) as slow-release Se biofertilizers was evaluated through pot experiments with and without planted green beans (Phaseolus vulgaris). The Se concentration in the bean tissues was 1.1-3.1 times higher when soils were amended with Se-enriched sludge as compared to Seenriched duckweed. The results proved that the Se released from Se-enriched biomaterials was efficiently transformed to health-beneficial selenoamino acids (e.g., Se-methionine, 76-89%) after being taken up by beans. The Se-enriched sludge, containing mainly elemental Se, is considered as the preferred slow-release Se biofertilizer and an effective Se source to produce Se-enriched crops for Se-deficient populations, as shown by the higher Se bioavailability and lower organic carbon content. This study could offer a theoretical reference to choose an environmental-friendly and sustainable alternative to conventional mineral Se fertilizers for biofortification, avoiding the problem of Se losses by leaching from chemical Se fertilizers while recovering resources from wastewater. This could contribute to the driver for a future circular economy.
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