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Simulations of the Photosynthetic Rates of Three Selections of Grain Sorghum with Extreme Leaf Angles

Simulations were based on leaf angle distribution data taken by U. D. Havelka, during an experiment in which two "erect-leaved" strains of grain sorghum (Sorghum bicolor (L.) Moench.) and one ‘normal-leaved" variety, ‘Caprock,’ were grown in equidistant patterns at high and low densities (13 x 10⁵ and 5.2 x 10⁵ plants/ha). Data on leaf photosynthetic rate and solar irradiance were taken from the literature. At a leaf area index of 9, the calculated canopy photosynthetic rate of the most erect strain (P 407) was 10% greater than that of Caprock. At a leaf area index of 3, the rate for Caprock was slightly greater. The dry matter yields measured by Havelka at the end of his experiment differed by almost the same amounts. These differences, between "erect" and 'normal" genotypes, are much less than the maximum possible difference calculated by W. G. Duncan, using the same model of canopy photosynthesis but hypothetical leaf angle distributions.

Key Words: Canopy models

Received for publication January 14, 1974.