University of Wisconsin
Univ. Wisconsin Extension: Forage Resources: Alfalfa
A variety of articles on alfalfa management, variety selection, establishment and growth, fertilization, and pest control are offered here by the University of Wisconsin Extension.
Other
National Alfalfa Alliance: From Seed to Feed
The National Alfalfa Alliance offers information on varieties and performance, free online publications, and information related to the organizations efforts to promote alfalfa use and improvement.