A pot experiment was carried out to compare the biological characteristics of four winter wheat varieties that were released at different times over the past four decades: Yuanfeng 998 (recently released), Xiaoyan6 (released in the 1990s), Xiannong39 (released in the 1970s and 1980s) and Baimangmai (released in the 1960s). Wheat seeds from each variety were divided into two size classes (small or large) and then sown with one of three methods: small seeds sown alone (SA-S), large seeds sown alone (SA-B) and...
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