  A method for numerically integrating transport equations, combining transfer
matrices, transmission-reflection matrices, and Green's matrices (TTRG), was
recently proposed. The present paper deals specifically with azymuthally
integrated radiances inside a horizontally homogeneous canopy of Lambertian
leaves. Its main purpose is to test the accuracy of TTRG by applying it to
non-trivial models possessing analytical solutions, that were given in another
paper. Comparison is made with the widely used iterative integration (or
'relaxation' method). Cases of extreme light trapping are given for which
iterative integration is hardly practical, while TTRG remains as accurate and
rapid.
