Interaction Mechanism of Fe, Mg and Mn in Karst Soil-Mango System

Manganese (Mn), an essential trace element for plants in which it is involved redox reactions as a cofactor many enzymes, represents important factor environmental contamination. Excess Mn can lead to toxicity conditions natural and agricultural sites. one of the most severe growth limiting factors acid soil, accounts 21% total arable lands China. The more significant part Mn-toxicity its interactions with other mineral elements, particular phosphorus (P), calcium (Ca) iron (Fe). application P or Ca be beneficial detoxification manganese, whereas seems interfere Fe metabolism. varies plant species, nutrients, soil environment. Mango main economic fruit karst area subtropical region mango orchard characterized by high Fe, Mg. In order explore interaction among Mg, systems under conditions, typical depression landform Baise southern China was selected study effects Mg on toxic expression mechanism Fe-Mn-Mg plants. results show that: (1) status closely correlated Fe2+ (active iron) same concentration; (2) black spots leaves were mainly caused Mn. There lot Fe3+ Mn3+ spots, than 90% total; (3) addition, studies also showed that inhibited mango. Conclusively, effect Mn, affects growth, indicate