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  1. Vol. 22 No. 5, p. 981-983
     
    Received: Sept 30, 1981
    Published: Sept, 1982


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doi:10.2135/cropsci1982.0011183X002200050020x

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

  1. W. A. Compton and
  2. J. H. Lonnquist2

Abstract

Abstract

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 ✕ proportion of upright plants ✕ 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.

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