​​​Soybean Maturity Groups

January 2015 | 13 min., 35 sec.
by Jim Orf
University of Minnesota

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Summary

​This presentation will help consultants, growers, and other practitioners in the soybean growing regions of the U.S. and Canada understand maturity group designations of soybean varieties developed by public and private institutions or companies. Flowering and maturity of soybeans are determined by the day length of the location where they are grown. Soybean breeders have developed thirteen maturity group designations (using roman numerals) ranging from 000 to X. Maturity group 000 (triple zero) would designate soybean varieties adapted to tropical regions. In the U.S. producers grow maturity groups 00 to VIII. Many companies or institutions now use Arabic numbers for maturity groups and divide each maturity group into tenths (for example 2.9 or 5.8). If planted in mid-May, a full season variety (for a given location) will mature before the first frost (late September to early November). Maximum yield is usually obtained by using a full season variety.

About the Presenter

Jim OrfJim Orf earned his MS and PhD from the University of Illinois. He is a Professor in the Department of Agronomy and Plant Genetics at the University of Minnesota where he oversees a soybean variety development program which includes food type soybeans. He conducts research on soybean genetics, soybean breeding methodology and soybean variety evaluations. He collaborates with other researchers (departmental, university, national and international) in both the private and public sectors, in conducting soybean research. Dr. Orf teaches a class entitled "Plant Genetics and Breeding," and assists in training graduate students working on soybean breeding projects as well as those focusing on a variety of other projects. Dr. Orf has published over 135 refereed journal articles and 290 proceedings and abstracts. He has released nearly 100 soybean varieties. He has received several awards which include Fellow of American Society of Agronomy, Crop Science Society of America, and American Association for the Advancement of Science. Dr. Orf has also served as a volunteer with the Peace Corps in Kenya.​

Contact Information:
Email: orfxx001@umn.edu

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