文档介绍：MicronutrientelementsChapter14GeneralCharacteristicsNutrientSoilContent(kg/ha)CornRemoval(kg/ha)Boron(B)22-(Cu)2-(Fe)11,200–224,(Mn)112-11,(Mo)1-(Zn)22-.  “LawoftheMinimum”.,. Cations:Fe2+,Fe3+,Mn2+,Zn2+,Cu2+2. Anions:MoO42-,Cl-3. Neutral:H3BO3GeneralCharacteristicsMicronutrientfunctioninplants1. Enzymesandcoenzymesa)   ponentofenzymesb)  Involvedintheactivationandregulationofenzymes2. OxidationandreductionreactionsMicronutrientsareinvolvedinelectrontransportMicronutrienttransformationsinthesoil1. Thetransformationsthatmicronutrientsundergointhesoilvarydependingonthenutrient,butoverall,)  Mineralizationandimmobilizationb)  anicmattersurfacesc))  Thewordchelatemeans“claw”.)  )     )     )   :Naturalchelates(1)  anism,suchasSiderophores高铁载体andphytosiderophores植物高铁载体(2)  anicmatter,suchasfulvicacids(3)Man-madechelates:EDTA,DTPAEDDHAetcThechelationprocessinthesoil