Abstract
The effect of sward structure of the mixtures and nitrogen fertilization on grass-legume silage quality was investigated over two years. The study included Lucerne ( Medicago sativa ) in monoculture and in mixtures with cocksfoot ( Dactylis glomerata ), tall fescue ( Festuca arundinacea ) and sainfoin ( Onobrychis sativa ). Nitrogen fertilizer was applied to the field plots at four different rates: 0, 70, 140 and 210 kg ha -1 . The quality of lucerne silage was inferior to lucerne silage mixed with grasses due to the greater content of ammonia nitrogen (NH 3 -N), acetic (AA) and butyric acids (BA), and reduced content of the lactic acid (LA). Gradual increase of N fertilization significantly has increased the content of NH 3 -N, AA and BA and decreased the content of LA.
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