Existing methods of predicting of radiocaesium transfer from soil to plants was critcally reviewed. The analysis of radiocaesium behavior in the system "soil solid phase/pore solution/plant" was carried out. Equations for calculation of radiocaesium uptake by plants as a function of soil properties were obtained and tested using the reported experimental data. Key soil parameters which natural variability and estimation difficulty are the main sources of prediction uncertainty were identified.