The excessive amount of rainfall that we have received in Iowa over the last 2 months, and particularly the last week, has caused excessive flooding in many areas. River bottoms are completely flooded and will probably not be able to be planted now for the next 2 to 3 weeks or at all this year. For the majority of the fields the water should drain and dry quickly, barring no more excessive rainfall.
Iowa State University
Pedersen, Palle, "Effect of Flooding on Emerged Soybeans" (2008). Integrated Crop Management News. 894.