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A Multiplicative Selection Index Applied to Four Cycles of Full-Sib Recurrent Selection in Maize¹

A condensed form of full-sib family recurrent selection in maize (Zea mays L.) is described that requires two growing seasons per cycle. Results of four cycles of selection in the open-pollinated variety Krug in Nebraskare reported. The selection criterion was a multiplicative selection index composed of grain yield adjusted by proportion of dry matter x proportion of upright plants x proportion of plants without dropped ears. Yield increased 2.9 quintals/ha/cycle (4.7%) whereas the index increased 2.8 quintals/ha/cycle (5.8%). Proportions of dry matter, upright plants, and plants without dropped ears showed non-significant but positive changes.

Key Words: Zea mays L. • Grain yield • Dry matter • Upright plants • Dropped ears

² Professor of agronomy, Univ. of Nebraska, and professor of agronomy, Univ. of Wisconsin, Madison, WI 53706.

Received for publication September 30, 1981.

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