Abstract
The state of mixed swards of red fescue, Kentucky bluegrass and bird?s foot trefoil was studied. The experiment was situated along the slopes of the Central Balkan Mountain, during the period of the 1st to the 13th year of their creation. At a high degree of soil gleying, the low part of the slope, the dry matter yields were within the limits of 2.8 t/ha (1997, south-eastern exposure) up to 10.66 t/ha (1999, north-eastern exposure). At a low degree of soil gleying, high part of the slope, the dry matter yields were within the limits of 2.34 t/ha (1994, western exposure) up to 14.34 t/ha (1995, east exposure). The most prominent in productive terms for the period of the study are the variants at the east and south-eastern exposure, slightly gleyed soil. The participation of the sown species in the total forage yield is variable quantity. They reach (at their most) up to 96% in 1998, north exposure, slightly gleyed soils and up to 97% in 2000, north-east exposure, highly gleyed soils. Their share was small in 2004 (44%) and in 2006 (42%) on a western slope, highly eroded soils.
Highlights
In the previous study (Mitev et al, 1992) a number of positive results have been determined in the growing of mixed sward of red fescue, Kentucky bluegrass and bird’s foot trefoil of local origin, which are a subject of patent work
At a high degree of soil gleying, low part of the slope, the dry matter yields were within the limits from 2.8 t/ha (1997, south-eastern exposure) to 10.66 t/ha (1999, north-eastern exposure) (Table 1)
The opportunity for prolonged use of artificial meadow wards has been found in the slopes of the Central Balkan Mountain
Summary
In the previous study (Mitev et al, 1992) a number of positive results have been determined in the growing of mixed sward of red fescue, Kentucky bluegrass and bird’s foot trefoil of local origin, which are a subject of patent work. We share the view of some authors that the combination of certain species could ensure priority of the mixed swards through better use of the resources of the environment (Sanderson et al, 2001). The combination of components in the swards, as well as the determining of their number should be a result from their behaviour in the conditions of the habitat. The aim of the study was to estimate the permanence of a mixed sward consisting of red fescue, Kentucky bluegrass and bird’s foot trefoil with a local origin during the thirteen years period, along the slopes of the Central Balkan Mountain
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