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Direct Measurement of Irradiance upon Phototropic Soybean Leaves throughout the Day

Small solar cells attached to soybean [Glycine max. (L.) Merr. ‘Corsoy’] leaflets were used to measure the irradiance upon the leaflets throughout the day. Irradiance upon five fixed plane surfaces was also measured and compared with the leaf irradiance. Under some conditions the upper leaves received more radiant energy than did any fixed plane. Phototropism increased the total radiant energy interception by leaves at the top of the crop canopy. The midday inward movement of leaflets reduced the energy interception by the top leaves and allowed more light to reach the lower leaves.

Key Words: Glycine max (L.)

Received for publication May 9, 1983.