PERSITENCY OD ARTIFICIAL SWARDS WITH PARTICIPATION OF RED FESCUE LOCATED ON THE SLOPES OF THE CENTRAL BALKAN MOUNTAINS. V. STATE OF MIXED SWARDS OF RED FESCUE AND BIRDSFOOT TREFOIL

摘要

State of mixed swards of red fescue and birdsfoot trefoil located on the slopes of the fore/mountain was studied for a 13-year period (1994-2006). At a low degree of soil gleying, upper slope part, the average yield was highest, 793 kg/da, at southeasterly exposure. The yield was lowest, 543 kg/da, at westerly exposure. At a high degree of soil gleying, lower slope part, the highest average yield of 772 kg/da was obtained at northeasterly exposure. The lowest average yield of 525 kg/da was obtained at southeasterly exposure. The swards had high sustainability of development, the presence of the sown species in the total forage mass in some variants being up to 97% (northeasterly exposure, greatly gleyed soils, year 1996, 2000; northerly exposure, slightly gleyed soils, 1998).