 you'll start seeing on the new foliage, that foliage is starting to turn yellow, typically between the veins of the leaves, so they call it intravenal chlorosis. As that gets worse, you'll notice those leaves will tend to almost bleach out, and then you'll get leaf dieback that can lead into branch dieback. Eventually, that whole tree can die if it's not corrected. So the product soy green has an iron chelate that is E-sodium.