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The experiment with natural meadow of Agrostis capillaris - Festuca fallax type in Rhodope Mountains (Smolyan region, Southern Bulgaria) shows that according to fertilization variants there is a clear tendency towards earlier start of active vegetation and its next phenophases. Most and almost equal amounts of dry biomass (4.38 and 4.31 t.ha -1 ) were reported in fertilization with N160P80K80 and N160P80, which exceeded the unfertilized control by 128.12 and 124.48%, respectively. Compared with unfertilized variant, the crude protein content increased in all fertilizing variants, as in complete mineral fertilization with N80-160 accumulates the crudest protein - respectively 314 g.kg -1 and 318 g.kg -1 . As regards to other studying chemical indicators of the forage (crude fiber, crude fat, crude ash and nitrogen-free extract substances) the mineral fertilization also had an expressed positive effect.

biotechnology in animal husbandry/biotechnology in animal husbandry

Influence of mineral fertilization on some biological and productive indicators of natural meadow of Agrostis capillaris-Festuca fallax type in the Rhodope Mountains (Southern Bulgaria)