Iron DP is a water soluble chelated iron (10%) for use on soils above pH 7.5. It is derived from iron (Fe) DTPA (Diethylenenetriaminepentaacetic acid).   Is a source of iron in a form which is readily available to plants. It performs best on highly alkaline and calcareous soils but will still perform on neutral to slightly acidic soils. This product provides increased iron availability in soil pH ranges from 8-12 due to its unique DTPA chelating agent.