Abstract
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 I1 (multiplicative index) was 54 and 29% above that based on yield alone in the B ✕ SS and B ✕ 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.
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