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Net and Spectral Radiation in Soybean Canopies¹

Net and spectral radiation profiles were measured for two soybean varieties of different leaf shapes. Net radiation attenuation differences were found for varieties but not for row spacings. The attenuation coefficient for both spectral and net radiation was very high, indicating the principal use of radiation is in the outer periphery of the soybean canopy. Net radiation was found to deviate from a Beer's Law absorption in the lower region of the soybean canopy.

Key Words: Beer's Law • photosynthesis • row spacing • Leaf Area Index

² Former graduate student, University of Illinois, (now Assoc. Prof, of Agronomy, U.P. Agricultural University, India); Research Soil Scientist, USDA, and Professor of Soil Physics, Agronomy Dept., Univ. of Illinois; and Professor of Agronomy, Univ. of Illinois, Urbana 61801, respectively.

Received for publication March 21, 1968.

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