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Effect of Varying Leaf Area by Partial Defoliation and Plant Density on Dry Matter Production in Corn¹

Synopsis: The net assimilation rate of corn was linear to leaf area index when this was less than 2.7 but declined rapidly when it was above that value. In a stand with a leaf area index of 3.3, dry matter produced per square meter of leaf area from grain initiation to maturity by the top, middle, and bottom leaves was of the ratio 4:2.2:1.

² Formerly Graduate Assistant (now Agronomist, Canada Experimental Farm, Beaverslodge, Alberta, Canada), and Professor of Soil Technology, Cornell University.

Received for publication February 13, 1962.

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