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Comparison of the Efficiencies of Selection Indices for Three Traits in Two Variety Crosses of Corn¹

The gains expected from selection based on five selection indices of three types, i.e., simple multiplicative and additive indices, and indices constructed by formal statistical procedures (Smith's index) involving three traits (grain yield, stalk lodging, and dropped ears) and also based on single traits were calculated in two variety crosses of corn (Zea mays L.). Economic importance was assigned to stalk lodging and dropped ears by assuming that a 1% increase hi either trait results in a 1% decrease in grain yield. The gain in machine-harvestable yield expected from selection based on It (multiplicative index) was 54 and 29% above that based on yield alone in the B x SS and B x K populations, respectively, while the increases from the use of I₅ (Smith's index) were 56 and 32%. The possible utility of I₁ is discussed.

Key Words: Selection index • Economic importance • Correlations • Total gain from selection • Maize

² Graduate Student (now at Research Institute for Agriculture, Bogor, Indonesia), Associate Professor, and Post-doctoral Fellow (now Assistant Professor, Division of Plant Breeding, Department of Agronomy, University of the Philippines, College, Laguna, Philippines), Department of Agronomy, University of Nebraska, Lincoln, NB 68503.

Received for publication May 26, 1972.