Soybeans in the area are beginning to turn yellow as the later crop is nearing maturity. The most common question that I have received recently has been about soybean harvest aid timing. The proper timing of the these products vary based on what product you are using, but with every product the soybeans must be fully mature and the pods must have turned a tan to brown color.
Here is the section from the Georgia Pest Management Handbook that has specific recommendations for each harvest aid product available in soybeans:
This can also be found on pages 516-517 of the 2014 Georgia Pest Management Handbook or at the following link:
If you have any questions, contact your local extension agent for more information.