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Adaptedness and Heterosis in Corn and Mule Hybrids

Department of Crop Sciences, University of Illinois, Urbana, IL 61801

View larger version (22K): [in a new window]   Fig. 1. Average U.S. corn yields and kinds of corn, Civil War to 2004. "b" values (regressions kg bu–1) indicate production gain per unit area per year (USDA-NASS, 2005).

View larger version (17K): [in a new window]   Fig. 2. Yields of single-cross hybrids, their inbred parents, and heterosis per se over six decades in percentage of 1930s values. Percentage of heterosis is in actual values for each decade. From combined Experiments 2 and 3 in Table 3–2 (Duvick, 1999).