Bidirectional reflection and transmission distribution functions are measured for healthy green soybean and corn leaves in vivo, for nineteen narrow wavelength bands from 375 nm to 1000 nm. Off-normal incidence reflection distribution functions show considerable specular contributions at wavelengths of strong absorption, while transmission distribution functions show a near-lambertian shape for all wavelengths employed. An empirical m-layer leaf model affords a reasonable qualitative understanding of these scattering distributions.
H. T. Breece III and R. A. Holmes, "Bidirectional Scattering Characteristics of Healthy Green Soybean and Corn Leaves in Vivo," Appl. Opt. 10, 119-127 (1971)