High Performance Iron Chelate for Foliar, Hydroponic and Soil Applications 10% fully chelated DTPA iron helps prevent iron chlorosis by maintaining and protecting iron availability in slightly acidic to slightly alkaline soils with a pH of up to 7.5. It prevents iron from binding with other compounds in the soil, allowing it to stay in a form readily available for plant and turf use for improved quality. For easy measuring and mixing, 10% Iron DTPA chelate is available in a highly soluble, concentrated powder which offers excellent tank mix flexibility with NPK fertilizers and plant growth regulators for both foliar and soil applications.