Effect of soil properties on time-dependent fixation (ageing) of selenate

Ramkissoon, Chandnee; Degryse, Fien; Young, Scott; Bailey, Elizabeth H.; McLaughlin, Michael J.

Abstract

© 2020 Elsevier B.V. Previous biofortification studies have established that the residual effect of added selenium (Se) fertilisers on second-season crops is minimal. To explore the fate of exogenous Se in soil, chemical and biological methods were employed to assess the change in Se bioavailability with time. Eight soils varying in physicochemical properties were spiked with sodium selenate (0.5 mg kg−1 Se) and incubated at 25 °C for different periods (1, 30, 60, 90 and 300 d). At the end of the incubation, soil Se was fractionated by a sequential extraction procedure into ‘soluble’, ‘adsorbed’ and ‘organically-bound’ Se fractions. Simultaneously, wheat was grown in the Se-aged soils, under controlled conditions for six weeks, and uptake was determined. A general decrease in Se solubility over time was observed, but the rate of decrease varied depending on soil type. A reversible first order model fitted the Se ageing kinetics well, except in an Oxisol. The most pronounced ageing was observed in calcareous soils. Concentrations of Se in the shoots of wheat grown in freshly spiked soils ranged from 71.8 ± 17.5 mg kg−1 in calcareous soils to 110 ± 31.6 mg kg−1 in non-calcareous, low-OM soils. With ageing, shoot Se concentrations decreased to

Citation

Ramkissoon, C., Degryse, F., Young, S., Bailey, E. H., & McLaughlin, M. J. (2021). Effect of soil properties on time-dependent fixation (ageing) of selenate. Geoderma, 383, Article 114741. https://doi.org/10.1016/j.geoderma.2020.114741

• Journal Article Type: Article
• Acceptance Date: Sep 14, 2020
• Online Publication Date: Sep 22, 2020
• Publication Date: Feb 1, 2021
• Deposit Date: Apr 25, 2021
• Publicly Available Date: Sep 23, 2021
• Journal: Geoderma
• Print ISSN: 0016-7061
• Electronic ISSN: 1872-6259
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 383
• Article Number: 114741
• DOI: https://doi.org/10.1016/j.geoderma.2020.114741
• Keywords: Soil Science
• Public URL: https://nottingham-repository.worktribe.com/output/5175412
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S001670612030923X?via%3Dihub