Keywords: peaty-gley soil, potash fertilizers, rates, perennial grasses, productivity, efficiency 

// Мелиорация.– 2020. – №1(91) – P 56–60

It was found that the highest productivity of perennial grasses on peaty-gley soil with optimal parameters of its availability of mobile forms of phosphorus and potassium is provided by the use of P₉₀K₁₈₀ (P₉₀K₁₂₀ – for the first mowing and K₆₀ – for the second mowing), which is 67.9 C/ha of hay or 34.6 C/ha of feed units. With the payback of rates of phosphorus and potash fertilizers P₉₀K₁₂₀ by adding hay on average 4.6 kg per 1 kg of RK, increasing the rate of potassium to 180 kg/ha increases the payback of fertilizers to 7.1 kg of hay.