Genetic improvement in winter wheat yields in the Great Plains of North America, 1959-2008.

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Yield Gap and Production Gap of Rainfed Winter Wheat in the Southern Great Plains (2014, background): “However, Graybosch and Peterson (2010) found no statistically significant genetic gains in experimental wheat yields from 1984 to 2008 in the SGP.”
Genetic Gains for Grain Yield in CIMMYT Spring Bread Wheat across International Environments (2012, background): “There are many factors responsible for wheat yield stagnation (Rajaram, 1999; Brisson et al., 2010; Petersen et al., 2010; Graybosch and Peterson, 2010); varieties could be one of them.”
The Physiological Basis of the Genetic Progress in Yield Potential of CIMMYT Spring Wheat Cultivars from 1966 to 2009 (2015, background): “However, there are also some cases in which the genetic progress appears to be showing a plateau, for example, winter wheat in the great plains of North America between 1984 and 2008 (Graybosch and Peterson, 2010) and spring wheat in Chile between 1990 and 2000 (Matus et al.”
Genetic Progress in Grain Yield and Physiological Traits in Chinese Wheat Cultivars of Southern Yellow and Huai Valley since 1950 (2017, background): “However, other studies showed no or very small genetic gains in yield potential over time (Graybosch and Peterson, 2010; Matus et al., 2012; Beche et al., 2014).”