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We study random sequential adsorption of polydisperse mixtures of extended objects both on a triangular and on a square lattice. The depositing objects are formed by self-avoiding random walks on two-dimensional lattices. Numerical simulations were performed to determine the influence of the number of mixture components and length of the shapes making the mixture on the kinetics of the deposition process. We find that the late stage deposition kinetics follows an exponential law θ (t) ∼ θjam -A exp (-t/σ) not only for the whole mixture, but also for the individual components. We discuss in detail how the quantities such as jamming coverage θjam and the relaxation time σ depend on the mixture composition. Our results suggest that the order of symmetry axis of the shape may exert a decisive influence on adsorption kinetics of each mixture component. © 2008 The American Physical Society.