OCCURRENCE OF BASIC PHENOLOGICAL PHASES FOR SEVERAL SPECIES OF WHEATGRASSES AT THE HIGH-MOUNTAIN CLEAN OF TREES AREA OF THE CENTRAL BALKAN NATIONAL PARK

Abstract: We specified the moments of occurrence of basic phases in growth of four species of wheatgrassses – Agrostis capillaries L., Festuca rubra L., Larchenfeldia flexuosa (L.) Schur. and Nardus stricta L. on territory of the “Central Balkans ” National Park. We drew a phonological spectrum of the plants depending on the particular climate. We fixed the optimum period for starting and ending grazing cy-cle on the studied territory