The pollution of an environment with radionuclides in result of radiating accidents renders large influence to organization of plant and animal breeding on these territories. The main problem, arising especially in late period of development of a radiologic situation is a problem of obtaining the "clean" plant production. Its decision allows to minimize the radionuclides transfer to yield of agricultural plants and at the expense of it to limit transition of radioactive substances to organism of the person on agricultural chains. By traditional measures, directed on reduction of radiocesium accumulation in a useful part of plants, consider use of agrotechnical and agromeliorative methods (agricultural countermeasures) in technologies of plant breeding. The validity of these measures proves to be true by experience of overcoming the consequences of radiating accidents in the atmosphere. Whereas, reduction of the efficiency of these means is marked during their repeated application. Besides that, the negative aspect of countermeasures (the entering of raised dozes of mineral fertilizers, calcium and etc.) is reduction of soil fertility, and also destabilizing influence on components of cenoses. As a rule, the zones of radioactive pollution are zones of ecological stress, caused by heavy metals pollution, acting in soil as at the expense of agricultural activity of the person (with pesticides, mineral fertilizers and etc.), and at regulated or emergency ejections of the chemical, metallurgical and other industrial enterprises. The existence of agroecosystms in conditions of Technogenous "pressure" requires additional attention to the implemented technologies and introduction of new means and methods, including non-traditional, processes directed on regulation of the toxicant transport in system soil - plant. Determining, from this point of view, may be those methods that influence the physiological and biochemical processes in vegetative organisms, adjusting exchange processes, and at the same time are ecologically safe, and do not bring in additional Technogenous load on agricultural sphere. The available information and the own results testify the effectiveness of usage in these purposes of plant growth regulators - substances with biological activity. The mechanism of action of biologically active substances on plants is connected with their influence on protein-synthesizing system, biosynthesis of nucleoacids, biosynthesis of protein- enzymes. Thus, the development of effect depends on properties of the preparation (concentration, doze), biological object (agricultural plant), and, at last, conditions of cultivation (especially on the characteristics of levels of Technogenous contamination). We show various efficiency of preparations, differences in directions of their action depending on density of radioactive contamination of soil and concentration of preparations. On the basis of received data the conclusion about opportunities and restrictions in use of biologically active substances in technologies of cultivation of agricultural plants on Technogenous contaminated territories is made.
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