Аннотация:To solve the problems of optimization of remediation of agricultural lands affected by nuclear accidents, it is necessary to study the parameters of accumulation of radionuclides by agricultural crops and to determine the factors influencing this process. The results of the following studies are presented: assessment of the influence of the mineralogy of the clay fraction of soils on the behavior of 137Cs in soils; parameters of migration of isotopes 137Cs and 40K from the soil to the vegetative mass of pasture grasses; the effect of agromeliorants (natural sorbents and potash fertilizers) on the biological mobility of 137Cs in soil based on radiocaesium interception potential (RIP).