Imbitional Chilling & Cold Stress in Corn & Soybeans
The first “drink” for corn is critical. It is very important in soybeans as well. The rule of thumb is you need 2 good days of warm and warming soil for corn and at least 1 for soybeans.
Temperatures need to be around 50 degrees, warming, and dry. A soaking cold rain is the worst case scenario for germinating seedlings.
Cold temperatures can rupture cells in seeds. This will result in chilling injury. Cold temperatures that do not cause chilling injury, at a minimum, will disrupt growth rate and this is where hybrid selection and emergence scores are critical.
Early-Planted Corn & Cold Weather – Purdue University
Corn, Soybean Planting Considerations for this Week’s Cold Snap – University of Nebraska