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.
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Colville et al. (1964) studied this question.