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Measurements of the radar backscatter coefficient gamma of single vegetation species, woods, and bare soils are reported. It is shown that in the measuring set-up used all samples investigated contained sufficient scatterers to give a Rayleigh distribution at the output and that the decorrelation time is sufficiently short to obtain an adequate number of uncorrelated samples in one measurement. In SLAR observations the r.b.c. gamma as a function of frequency and polarization is the only possible classifier for vegetation species. Its total variation, however, is small approximately and requires, as a consequence, a fairly high accuracy in the measurements when variations in r.b.c. gamma are also to be used as an indicator for variations in biomass, plant vigor, moisture content, etc. (Author)