Selenium Species and Fractions in the Rock-Soil-Plant Interface of Maize ( L.) Grown in a Natural Ultra-Rich Se Environment.

Selenium (Se) enrichments or deficiency in maize ( L.), one of the world's most important staple foods and livestock feeds, can significantly affect many people's diets, as Se is essential though harmful in excess. In particular, Se-rich maize seems to have been one of the factors that led to an outbreak of selenosis in the 1980s in Naore Valley in Ziyang County, China.