Infrared Reflectances of Plant Leaves

Abstract

The total spectral reflectances ofleaves have been measured over the wavelength range 2-12 p.m or 2-14 p'm for 15 plant species, and at the wavelengths 8, 10, and 12 p.m for a further 32 species, the radiation being incident at 10° to the normal. At wavelengths greater than 3 p.m the reflectances are less than 0·05 for the majority of the leaves, and values greater than O· I have been obtained for leaves from only one species. In the 2-3 p'm region higher values of reflectance are common.