During the period 2005-2008 at the Experimental Station of Agriculture in the town of Sredetz, based on field experiment with organo-mineral fertilization of grass mixture comprising: alfalfa (Medicago sativa L.)-60%, tall fescue (Festuca arundinaceae, Schreb)-20%, and cocksfoot (Dactylis glomerata L.) – 20%. The following variants were included in the trial: 1. Background P80K80 -kg/ha – control, 2. N40P80K80 kg/ha; 3. N80P80K80 kg/ha; 4. N120P80K80 kg/ha; 5. Bovine manure of 20 t/ha; 6. Bovine manure of 40 t/ha; 7. Sheep manure of 20 t/ha; 8. Sheep manure of 40 t/ha; 9. Treatment was before sowing of seeds and three times as leaf fertilization with humustim. The purpose of this study was to test the influence of organo-mineral fertilization on the development
of perennial grass mixture, cultivated in Strandzha region, Bulgaria. It was found that the fertilization with mineral fertilizer reduces the participation of pulses, increasing that of wheat and various types of grass. Fertilization with manure reinforces the presence of leguminous grasses, increases density, reduces participation of weeds and weed composition. Leaf treatment with humustim increases the participation of legumes and decreases weed components, but reduces the density of grass mixture.
K. Stoeva, V.Vateva