Selenium in Soils and the Need for Biofortification of Crops
Introduction Selenium (Se) is thought to exist in many soils mainly in the inorganic species selenite (SelV) or selenate (SeVI), and as various organic reduced Se compounds. The latter are not well characterized, but may include organic molecules chat contain the selenium-substituted amino acids and selenomethionine, selenocysteine and selenocystine. At soil pHs ranging from 3-10 selenate is the predominant form when the soils are highly oxic and the redox potential (Eh) is high, but selenite can also predominate in soils of only slightly lower Eh, because reduction of selenate to selenite occurs at Eh values above 0 to +200 mV (Neal et al., 1987). Also, soils may also have microsites with slightly less oxic conditions, which may help reduction to occur.
McGrath S P Zhao F J
Rothamsted Research, Harpenden, Herts, AL5 2JQ, UK
国际会议
苏州
英文
3-4
2011-10-23（万方平台首次上网日期，不代表论文的发表时间）