Iowa State University Extension

Web Pages
Check out for these sources of information for growing soybeans in Iowa.
Integated Pest Management
Ag Weather
Value-Added Agriculture
Iowa Grain Quality Initiative
Agricultural  Marketing Resource Center
Iowa Manure Management Group
Asian Soybean Rust

Publications
Soybean Growth and Development (PM 1945) offers detailed information on soybean growth stages. 

There are additional soybean production publications available from the ISU Extension Online Store.

Other Resources
There are several resources available from Iowa State University to help soybean producers.
     Plant Disease Clinic
     Weed Clinic
     Insect Clinic
     Seed Science Center
     Integrated Crop Management Newsletter