Keywords: shallow peat soil, peaty-gley soil, ¹³⁷Cs, activity, transfer coefficient, nitrogen and potassium fertilizers, rates, perennial legume-cereal and cereal grasses

// Мелиорация.– 2021. – №4(98) – P 35–46

It has been established that on peat shallow soil, the use of P₆₀K₂₄₀(K₁₈₀ for the first grass cutting and K₆₀ for the second grass cutting) under perennial legume-cereal grasses reduces the ¹³⁷Cs content in hay by 2.2–3.0 times. The use of nitrogen fertilizers in total rates from 30 to 90 kg/ha against the background of P90K180reduces the concentration of ¹³⁷Cs in the hay of the first cut by an average of 1.7–2.0 times, in the hay of the second cut by 1.5–1.9 times. On peaty-gley soil, phosphorus and potash fertilizers in rates of P₉₀K₉₀ reduce the transfer of ¹³⁷Cs into perennial grasses of the first cut by 27–28 %. When K120is introduced for the first cut, a decrease in ¹³⁷Cs input from the soil into plants is observed. Top dressing of grasses of the second cut with potassium at a dose of 30 kg/ha against the background of P₉₀K₉₀ provides a 50 % decrease in the coefficient of radionuclide conversion into hay. The introduction of cereal grasses N₆₀ and N₈₀ for the first cut does not significantly increase the ¹³⁷Cs intake into plants. The second nitrogen fertilization of grasses leads to a slight increase in the accumulation of ¹³⁷Cs in the hay of the grasses of the second cut. The intake of ¹³⁷Cs in hay at increased doses of nitrogen fertilizers (N120‒140) decreases against a high background of potassium use.