Southern Ag Chelated Citrus Nutritional Spray is derived from Ferrous Sulfate, Zinc Sulfate, Magnesium Sulfate, and Manganese Sulfate. It is strategically and carefully combined to treat, prevent, and control minor element deficiencies and other deficiencies that may cause yellowing of foliage. This plant food provides the minor elements essential to the healthy growth of citrus, avocados, mangos and other tropical fruits. It can be used at the first signs of the deficiency symptoms. Highly recommended to be used in between the month of December and February up until the time flowering is complete. Contains 1.2% Iron, 1.7% Zinc, 1.2% Manganese, 1.0% Magnesium, and 4.1% Sulfur.