Growers who observe these symptoms should confirm the manganese deficiency with a tissue sample to rule out similar problems that may cause similar symptoms (such as nematodes). If the manganese deficiency is confirmed, growers can apply manganese as a foliar spray and monitor the field to confirm if any additional applications are needed. Please check nutrient management guidelines in your state for more information. You can find more information about manganese deficiency in soybeans in Virginia
in this article from Virginia Cooperative Extension.