Background:
Iron deficiency chlorosis (IDC) is a physiological disorder in soybeans caused by iron deficiency in the plant. This can cause substantial yield loss within affected areas. IDC is not caused by a lack of iron in the soil, but more so an inability of the plant to take the iron in. Soybeans obtain iron from the soil by releasing acids from their roots into the soil that help solubilize the iron into a form more readily taken up by the roots. Soybeans are susceptible to IDC and are caused when the acids are not released.
Scouting:
When looking for IDC, be sure to look at the newest leaves. They will appear yellow with green veins. When IDC is severe, the leaves will turn white and plant growth may be stunted. IDC can also cause root rot.
Management:
- Plant non-susceptible hybrids.
- Minimize nitrate carryover from the previous crop.
- Apply EDDHA iron chelate as your iron input.
- Plant oat cover crop. (Soybean Research & Information Network)
