Revunova L. Dependence of potato productivity on combined application of growth regulators and fertilizers in the conditions of Polesye Ukraine.

The results of the research of modern questions are presented: dependence of efficiency growth regulators Emistim C and Fumar depending on the type of fertilizers (nitroamophoska and zeolitil) and feeding level (nitroamophoska N60P60K60 and N120P120K120 and zeolitil 1,5 and 3 t/ha) on the varieties of different groups of ripeness (early Dnipryanka, mеdium-early Polyana), and the possibility of radionuclides' control in potato tubers and dependence of efficiency of growth regulator Emistim C on the way, timing and number of treatment. It is proved that application of growth regulators in combination with mineral fertilizers nitroamophoska and zeolitil equivalent to key elements of NPK significantly increases the leaf area, net productivity of photosynthesis and efficiency of application with higher potato yield. It is set that the growth regulators Emistim C and Fumar substantially influence on the productivity of potato. More effective was application of growth regulator Emistim C. Efficiency of growthregulators grew at the increase of norms of feed. The maximal productivity is got on both sorts at application of growth regulators Emistim C and Fumar with fertilizers nitroamophoska norm of N120Р120К120 and zeolitil in the norm of 3 t/ha. At the sort of Dnipryanka the productivity made accordingly - 25,6 and 24,9 t/ha and 26,9 and 26,3 t/ha. On a sort Polyana made accordingly - 32,7 and 32,3 t/ha and 33,7 and 32,0 t/ha. The application of growth regulators increases the efficiency of fertilizers used in case of single ratio as well as double ratio application. The single application of the growth regulator Emistim C to potato tops upon complete germination proved to be more effective than application to the seed tubers. It is well-proven that on content to radionuclide Cs137 in potato tubers depends on difference of feeding level and specifics of potato varieties.