Chelate – Several of the minor nutrients such as iron may be prevalent in the soil but unavailable to the plant because they are locked in, fixed-held so tightly to the soil particles that they are unavailable to the plant. When a chelating agent is added to soil, the iron in the soil (or other minor elements) are made available to plants. Because iron is usually present in soils, a chelating agent has the same effect as adding chelated iron.
