The research investigated Lolium perenne, ‘Argona’, cultivated over 1997-2000 in pure stand, exposed to various fertilisation. The first cut was fertilised with 450 kg·ha^-1 of Polifoska 15, while the second and third cuts were exposed to foliar fertilisation with urea solutions (20, 25, 30%), twice 300 dm³ of spray liquid per hectare or as top dressing with solid ammonium nitrate. To compare the effects of nitrogen fertilisers depending on their physical properties, the quantity of nitrogen in ammonium nitrate with the quantity applied in urea solutions were balanced. There were estimated perennial ryegrass dry-matter yield and the content of soluble carbohydrates as well as some nitrogen forms in plant dry matter. The research showed a positive effect of foliar fertilisation with urea solutions on the yield and and content of total nitrogen, protein nitrogen, non-protein nitrogen and nitrate nitrogen in plants. Foliar fertilisation decreased the content of carbohydrates in dry matter of plants. The content of carbohydrates and nitrogen compounds significantly decreased after the first cut, while the lowest content of carbohydrates was recorded in the third cut and nitrogen compounds in the second one.

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