Some aspects of the rehabilitation of agricultural lands contaminated with radionuclides and heavy metals

In increasing anthropogenous impacts on the environment, the problem of obtaining plant products with minimal content of toxicants becomes more and more challenging. This problem is particularly relevant in the farming regions of Russia subjected to the effects of the accidents in the south Urals and Chernobyl, since reduction of radionuclide content in agricultural products is still among the main ways of decreasing the dose burdens for population. The situation is aggravated by the fact that to date, implementation of traditional methods connected first of all with the introduction as special agrotechnical methods and justified in the early post-accidental period is not as efficient as it was before. At the same time, it is just now that particular attention is given to the problems of plant production ecologization, which is especially important for lands subjected to technogenous contamination. From this point of view, biologically active substances (BAS) are of interest beyond any doubt. These substances are applied as regulators of plant growth, for increase of crop productivity and resistance to abiotic or biotic factors, and having potential ability of regulating the transfer of mineral substances into plants. The data available on the BAS application on radioactively contaminated lands confirm their effect on the processes of radionuclide transport in the chain: soil-plant-harvest. All these considerations give grounds for using this approach to minimize chemical toxicants in plant products, and to rehabilitate lands under conditions of their technogenous contamination