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Testcrosses of One‐ and Two‐Ear Types of Corn Belt Maize Inbreds. I. Performance at Four Plant Stand Densities 1
Author(s) -
Russell W. A.
Publication year - 1968
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1968.0011183x000800020032x
Subject(s) - biology , zea mays , grain yield , yield (engineering) , agronomy , poaceae , plant density , zoology , sowing , physics , thermodynamics
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 × 1, and a two‐ear single cross, 2 × 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 × 2) × 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 × 2) × 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 × 1) × 1 group than for the (2 × 2) × 2 group. The (2 × 2) × 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.