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Influence of Plant Population, Hybrid, and "Productivity Level" on Irrigated Corn Production¹

Synopsis: Highest grain yields were obtained from adapted full season corn hybrids grown at 16,000 to 20,000 plants per acre. Portions of the yield losses associated with planting early as compared to full season hybrids can be recovered by planting at higher populations per acre. "Productivity level" of the experimental areas and hybrid markedly influenced the slope, direction, and shape of grain yield curves.

² Associate Professors, Professor, Assistant Professor, University of Nebraska, and Superintendent, Box Butte Exp. Station, respectively.

Received for publication November 18, 1963.

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