Эффективность азотных и калийных удобрений на антропогенно-преобразованной торфяной почве при возделывании многолетних бобово-злаковых трав

Abstract

On the anthropogenically transformed peat soil when the content in it moving phosphorus 700–790 and potassium 620–800 mg/kg of soil optimal doses of phosphate and potash fertilizers for perennial legume–cereal grasses are P90K180. Increasing the dose of potassium to 240 kg/ha is not significantly increases productivity, but reduces the return on fertilizer yield increase. When the content of soil organic matter at the level of 50–55 % and mineral nitrogen 145–155 mg/kg of soil the most effective dose of nitrogen fertilizer is N60, providing on background P90K180 hay yield of 141.0 t/ha or 71.9 feed units, payback nitrogen and 27.5 und total (NPK) mineral fertilizer 10.9 fodder units. With increasing doses of nitrogen to 90 kg/ha of fertilizer efficiency decreases.