History and Present Situation and Developing Tendency of Rare Earth Applied in Agriculture

摘要

History of rare earth applied in agricultureConcept of rare earth Rare earth(RE for short)is a general designation of 17 elements, including15 elements of lanthanum system, they are lan-thanum (La), cerium (Ce), praseodymium (Pr),neodymium (Nd), promethium (Pm), samarium (Sm),europium(Eu), gadolinium(Gd), terbium(Tb), dyspro-sium(Dy), holmium(Ho), erbium(Er), thulium(Tm),ytterbium(Yb), lutetium(Lu)), and 2 elements of