INTRODUCTION An important objective of the Nevada Applied Ecology Group (NAEG) program is to estimate the total amount (inventory) and geographical distribution of radionuclides in vegetation of fallout areas resulting from "safety tests" in which a chemical explosive was detonated in close proximity to assemblies of plutonium and/or uranium. Estimates of the total amounts of plutonium and uranium for vegetation at each site are given here. These were obtained using stratified random sampling wherein vegetation samples were collected adjacent to random soil locations within strata (subregions) at each site. The inventory estimates for vegetation reported here for plutonium represent data from about 60 percent of the samples collected and analyzed from the fallout areas. Inventory estimates for uranium. are preliminary in the sense that only about 20 percent of the total number of vegetation samples collected for estimating inventory have been analyzed for uranium. Updated estimates for plutonium and uranium will be given in future progress reports when these data become avail- able. METHODS Attention is directed to earlier progress reports for details of methods concerning the collection and processing of soil and vegetation samples (Gilbert and Eberhardt, 1974; Gilbert et al., 1975a; Romney et al., 1974, 1975) for determining 239°249py and 241Am contents (Major et al., 1974) in order to derive inventory estimates for the aged fallout areas. Estimates of inventory were obtained using the corrected stratum area estimates (Gilbert, 1977). Estimates of the standing biomass of perennial vegetation were made for each test area using nondestructive, dimensional measurements. Procedural details and calculations involving this method have been previously reported (Romney et al., 1974; Wallace and Romney, 1972). Some data for uranium radionuclides in soil and vegetation samples collected from Area 11, Site A, were reported previously (Gilbert and Eberhardt, 1976; Gilbert et al., 1975b). Results reported herein include data from analyses of additional vegetation samples from other study sites by the contract analytical laboratories. RESULTS AND DISCUSSION Estimated Inventory of Plutonium for Vegetation of Fallout Areas Estimates for the vegetational biomass of the different study areas are given in Table 1. Highest estimates were obtained from the study sites located on 36