VARIATION IN SOME MEADOW SWARDS WITH PARTICIPATION OF RED FESCUE ON THE SLOPES OF THE CENTRAL BALKAN MOUNTAINS: VI. BEHAVIOUR OF A MIXED SWARD OF RED FESCUE, TALL FESCUE AND BIRSDFOOT TREFOIL

摘要

Behaviour of mixed swards of red fescue, tall fescue and birdsfoot trefoil located on the slopes of the Central Balkan Mountains was studied from the 10th to 12th year after their establishment. At a low degree of soil gleying, characteristic of the upper slope part, green mass from 1290 kg/da at westerly exposure, greatly eroded soils (var. B4, 2003) to 2620 kg/da at easterly exposure (var. B1, 2004) was obtained. Dry matter was from 338 kg/da to 961 kg/da, respectively. At a high degree of soil gleying, characteristic of the lower slope part, the green mass was from 850 kg/da at easterly exposure (var. A1, 2003) to 2380 kg/da at southeasterly exposure (var. A2, 2004). The dry matter was from 245 kg/da to 824 kg/da, respectively Ratio between red fescue and tall fescue in the swards was in inverse proportional relation. Red fescue participation in some variants was up to 62% (A1, 2005) and that of tall fescue up to 70% (B2, 2003). Birdsfoot trefoil had insignificant participation. Weeds varied from 5% (B2, 2003) to 38% (B3, 2004) in the different variants.