With most soybeans being around the R3-R4 stage, it is an important stage for water intake. If possible, make sure to irrigate and consider adding a fungicide such as 5 oz of Lucento for added protection.
Keep an eye out for early signs of southern rust. You want to take care of it and get it under control before it gets out of hand. An inexpensive contact fungicide some farmers will use is Tilt at 4 oz/acre.