Fertilome Chelated Iron Fixes Plants With Yellow Leaves. Chelated makes it easier for the plants to take in the iron. You may also need to adjust the soil pH. Chelated Iron may be sprayed on the leaves or poured in the soil. For foliage application mix 1 Tablespoon per gallon of water. For soil application mix 1-16 oz. per gallon of water depending on the size of the tree or shrub. Flush the drive and sidewalk immediately after application as iron can stain. 1 Quart.