Fertilome Chelated Iron Corrects Yellowing Leaves Caused By Iron Deficiency. Because it is chelated it is more available to the plant. Chelated Iron may be sprayed on the plant for quick uptake or poured in the soil for longer lasting benefit. In many cases you will also have to adjust your pH value so your plants, especially Pin Oak, can take up the iron. May be used on potted plants, shrubs, lawns, citrus and shade trees, flowers and vegetables. For foliage spray 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. 1 pint.