Sequestrene Iron Chelate Sequestrene 330 Fe, 5 lb Equestrene 330 10% fully chelated DTPA iron chelate helps prevent iron chlorosis. High Performance Iron Chelate for Foliar and Soil Applications. Widely used for the correction of iron deficiency in certain crops in slightly acid to slightly alkaline soils. For easy measuring and mixing. Recommended by rosarians for use on roses, especially for show. 5 lb bag.