[en] Deposition of polydispersed aerosols of plutonium oxide, hydrated (aged) oxide, nitrate and citrate onto plant foliage has been studied in a low-speed wind tunnel designed for quantitative experimental studies of the interaction of airborne plutonium compounds with plant surfaces. Using concentrations of 1 to 4 nCi ²³⁸Pu/cm³ and a wind velocity of 1 cm/sec, mean deposition velocities onto both single leaves and canopies have been measured. For log normally-distributed aerosols having activity median aerodynamic diameters (AMAD) in the range 0.5 to 1.8 μm and geometric standard deviations (GSD) from 1.6 to 2.4, values of 3 x 10^-3 to 2 x 10^-2 cm/sec were obtained for single 10-day-old Phaseolus vulgaris L. seedling leaves. The corresponding values for 5- to 6-week-old canopies were 4 x 10^-3 to 1 x 10^-2 cm/sec. Aerosol size distributions were obtained, using an 8-stage impaction device calibrated in terms of the effective cutoff diameters (ECD) of unit density spheres. The above mean deposition velocities were compared with the ''expected'' value based upon the quantity of material in each impactor size range and the corresponding theoretical deposition velocity for each ECD