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Ten years were carried out experiments which started in 1987 on the six-years permanent meadows in locality Łukowe (400 m/a.s.l.). The doses of nitrogen fertilizers were 0, 80, 160, 240 and 320 kg N/ha. Whereas phosphorus and potassium doses were 100 kg P₂O₅ and 120 kg K₂O/ha. The yield of total protein systematically increased with the increase of nitrogen doses, and the differences between yields...
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