INFLUENCE OF NITROGEN FERTILIZERS ON ACCUMULATION OF137Сs PERENNIAL CEREAL GRASSES ON PEARLY-GLAY SOIL

Abstract

The application of N_60-80 herbs under the first cut rates not significantly increase the intake of¹³⁷Cs in plants. The second nitrogen fertilization of herbs in rates of 40-60 kg/ha increases the accumulation of the radionuclide in the hay of second-cut grass with respect to the phosphorus-potassium backgrounds. Nitrogen fertilizers on the background of P₉₀K₁₅₀ lead to a slight increase in the transfer factor of¹³⁷Cs to perennial grass when they are applied in doses of 120-140 kg/ha. At the same time, on a higher background of the use of potash fertilizers (P₉₀K₁₈₀), the radionuclide transfer factor into hay and with higher rates of nitrogen fertilizers (N_120-140) rates not exceed 0,30-0,31. On peaty-gley soil, when phosphorus and potash fertilizers are applied in rates of Р₉₀К_150-180 and nitrogen fertilizers in rates of N_100-140, perennial grass grasses can be cultivated without restrictions on the contamination density of¹³⁷Cs (up to 40 Ci/km²) for hay production when using it for fodder for receiving whole milk and meat meeting the republican regulatory requirements for the radionuclide content. For the production of meat with¹³⁷Cs content up to 200 Bq/kg, regulatory clean hay of the first mowing can be obtained using nitrogen fertilizers at a rate of 100 kg/ha with a soil contamination density of 38,0-40,0 Ci/km², and at doses of 120-140 kg/ha against Р₉₀К₁₅₀ with a density of up to 33.5 Ci/km², against a background of Р₉₀К₁₈₀ with a density of up to 38 Ci/km².