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Leaf Area-Leaf Weight Relationships in the Soybean Canopy¹

Leaf area (A) and leaf dry weight (LW) were determined throughout the growing season for lower, middle, and upper main stem segments and branches of a field soybean [Glycine max (L.) Merrill] community. The A/LW ratios were regressed on number of days after planting, using polynomial regression models. For the middle main-stem segment, A was also regressed on LW.

Mean seasonal A/LW decreased from the base to the top of the canopy. Mean A/LW of branches was higher than that of any main-stem segment.

The A/LW ralio of each main-stem segment continually declined until just prior to leaf senescence. The trend subsequently reversed and A/LW increased rapidly during leaf abscission. The trend in A/LW of the branches differed in that there was an initial increase in A/LW, followed by a decline and then a second increase during leaf abscission.

Due to time related changes in A/LW, models for the prediction of soybean leaf area from leaf weight should also include time as a variable if observations are made at different growth stages.

Key Words: Glycine max (L.) Merrill • Abscission of leaves

² Assistant Professor of Agronomy.

Received for publication February 21, 1971.