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Limitations in the Use of Leaf Dry Weight and Leaf Number for Predicting Leaf Area of Soybeans¹

Equations relating leaf area to leaf dry weight and to leaf number were developed for soybeans [Glycine max (L.) Merr.] grown in windbreak-sheltered and unsheltered plots during the 1978 and 1979 growing seasons. For each growing season, equations developed for a particular treatment were found to be accurate in predicting leaf area of independent samples taken from that treatment only. In a different treatment or growing season, the equations gave inaccurate estimates. This inaccuracy in predicting leaf area of plants grown in a different treatment or season was attributable to the differences in specific leaf area and leaf size. Our data indicate that prediction equations for soybean leaf area which utilize leaf dry weight and leaf number should not be used for soybeans grown in a different environment because of inaccuracy of estimates.

Key Words: Windbreak-shelter • Prediction equations • Leaf area • Glycine max. (L.) Merr.

² Graduate assistant and assistant professor, Dep. of Forestry, Fisheries and Wildlife, Univ. of Nebraska-Lincoln, NE 68583.

Received for publication May 12, 1980.