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Morphological and Physiological Traits in Maize Associated with Tolerance to High Plant Density¹

Maize (Zea mays L.) hybrids were grown at a high plant density (98,800 plants/ha) to determine the influence of several morphological and physiological traits on barrenness, the major factor limiting grain yields at high stand densities. Correlation and multiple regression analyses indicated density-tolerant maize genotypes would be characterized by rapid completion of silk extrusion, coincidence of pollen-shed and silk extrusion, rapid growth of the fust ear and first-ear silk, prolificacy, reduced tassel size, and efficient production of grain per unit leaf area. Breeding populations composed of these "plant types" should allow isolation and development of high-yielding and density-tolerant maize genotypes.

Key Words: Barrenness • Ideotype

² Former Graduate Research Associate, Assistant Professor, and Professor of Agronomy, Iowa State University, Ames, IA 50010. (Present address of senior author: Hawaiian Sugar Planters' Association, Honolulu, HI 96822.)

Received for publication November 9, 1973.

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