A2B2 showed an increasing trend from the 1940s to the 1960s varieties but did not appear again in the 1970s and subsequent varieties.
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Understanding the Effects of Growing Seasons, Genotypes, and Their Interactions on the Anthesis Date of Wheat Sown in North China.
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The sentences
A4B2 showed a decreasing trend from the 1940s to the 2000s varieties and did not appear in the 2010s varieties.