Modifications of Optimum Adaptation Zones for Soybean Maturity Groups in the USA

By Lingxiao Zhang, S. Kyei-Boahen, J. Zhang, Minghua Zhang, T. Freeland, C. Watson, Xingmei Liu. 2007

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Weed management using crop competition in the United States: A review (2017, background): “Soybean cultivars grown in the US are divided into different maturity groups, from Group 0, best adapted to region north of 46 N, to Group IX, best adapted to southern regions like southern Florida and Texas (Zhang et al., 2007).”
Delineating Soybean Maturity Groups across the United States (2017, methodology): “Also, Zhang et al. (2007) used convex parallel lines to delineate optimum MG regions and they continued the lines to the western regions of the High Plains states (North and South Dakota) where there was a lack of trial data.”
Understanding Soybean Maturity Groups in Brazil: Environment, Cultivar Classification, and Stability (2009, background): “Zhang et al. (2007) determined changes in U.S. cultivated materials regarding their maturity groups, and the latest groups are now cultivated on a limited basis.”