Interaction between selenium and soil organic matter and its impact on soil selenium bioavailability: A review

Middle to Late Holocene mobilization of DOC-bound Pb and Y in the Magellanic moorlands (53° S) as a function of sea spray fertilization, climate variations and volcanic fallout? A preliminary report

“…The significant top-to-bottom difference of Se enrichment in soils and its decoupling from lithogenic Se budgets suggests that the deposition by sea-salt aerosols to the ombrotrophic peat of the H horizon represent an important Se source (Wen and Carignan, 2009;Broder et al, 2015), especially during frequent storm events with strong westerly winds (Lamy et al, 2010;Schimpf et al, 2011). However, the fixation of Se to organic materials and its uptake by peat vegetation seem to be an important process here, which also controls the Se retention in comparable soil types (Li et al, 2017, Fig. 2a, b and d).…”

“…The high Se contents (20 ppm) detected in tephra are most likely to be explained by illuviation of Se complexed to soil organic matter (Li et al, 2017) due to prevailing podsolization processes (Vermeire et al, 2016). The vesicular structure of pumice particles promotes the accumulation of plant residuals (e.g., Hughes et al, 2013), in particular as Se in bulk samples of tephra-containing subsoils is reduced (Fig.…”

“…For that reason, Se concentrations in a stalagmite from the southernmost Andes have been previously used as a valuable paleoenvironmental proxy for sea spray deposition to the Magellanic moorlands (Kilian et al, 2013), especially since Se pollution by regional anthropogenic sources (e.g., industry, Wen and Carignan, 2009) is limited in such a remote study area. In soils characterized by high OC contents and acidic pore water, e.g., in peat soils, Se mobilization/immobilization is rather controlled by plant uptake and the adsorption onto organic substances than by adsorption onto Fe/Al (hydr)oxides (Li et al, 2017). Nevertheless, a certain amount of Se remains dissolved in soil solutions of acid environments (Li et al, 2017).…”

“…In soils characterized by high OC contents and acidic pore water, e.g., in peat soils, Se mobilization/immobilization is rather controlled by plant uptake and the adsorption onto organic substances than by adsorption onto Fe/Al (hydr)oxides (Li et al, 2017). Nevertheless, a certain amount of Se remains dissolved in soil solutions of acid environments (Li et al, 2017).…”

Foliar application: from plant nutrition to biofortification

“…Additionally, these studies included roles of nutrients in plant nutrition and then changed to the plant biofortification towards crop production (Singh et al 2016;Bouis and Saltzman 2017;Díaz-Gómez et al 2017). The biofortified crops include mainly zinc (Barrameda-Medina et al 2017), iron (Vasconcelos et al 2017), iodine (Gonzali et al 2017), selenium (Bañuelos et al 2015;Ros et al 2016;El-Ramady et al 2016a, b;Bañuelos et al 2017;Li et al 2017;Sharma et al 2017), manganese (Ullah et al 2016), folate (Strobbe Several ways could be used in delivering nutrients for plants including soil and foliar or spraying methods. Foliar application could be considered one of the most common methods, which used to deliver the needed nutrients to plants in adequate concentrations and improve plant nutritional status as well as increase the crop yield and its quality (Smoleń 2012).…”