Grower's Solution Iron Chelate 10% DTPA - Water Soluble Fertilizer -Gardens/Landscape/Nurseries - 5 lb. Bag 10% Iron Chelate DTPA water soluble fertilizer in a 5 pound bag. New green packaging for Chelated Iron. Same product different packaging. Chelated Iron is a great source of iron for your garden, plants, trees and flowers. Add Iron Chelate 10% DTPA to correct iron deficiency in slightly acid or alkaline soil. This is also used on golf greens and turf grass. Iron Chelate 10% DTPA can be added into the root zone or by rainfall and irrigation.