HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Russell, W. A. Search for Related Content PubMed Articles by Russell, W. A. Agricola Articles by Russell, W. A.

Testcrosses of One- and Two-Ear Types of Corn Belt Maize Inbreds. I. Performance at Four Plant Stand Densities¹

Ten single-ear and 10 two-ear inbred lines of maize, Zea mays L., were crossed with two testers (a one-ear single cross, 1 x 1, and a two-ear single cross, 2 x 2) and compared for grain yield at four plant densities at two locations for 3 years. The plant densities were 29,000, 38,700, 48,400, and 58,100 plants/ha. The (2 x 2) x 1 group had the lowest yield when averaged over all stand densities and environments; the other three groups had nearly equal mean yields. The (2 x 2) x 2 group had its highest yield at 58,100 plants/ha, whereas the highest yields of the other three groups were obtained at 38,700 plants/ha. The incidence of barren stalks at 58,100 plants/ha was fourfold greater for the (1 x 1) x 1 group than for the (2 x 2) x 2 group. The (2 x 2) x 2 group had 27.0% stalks with second ears at the 29,000 plant density, but these second ears accounted for only 9.8% of the total yield.

Key Words: genotype x stand level interactions • heritability values

² Professor, Iowa State University, Ames, Iowa 50010

Received for publication October 12, 1967.