On the Behavior of Certain Artificial Grasslands on the Slopes of the Central Balkan Mountain in Bulgaria

The research includes several studies on the behavior of some meadow grasses of local origin, which are the result of our selection. They are grown either as a monoculture or in a mixture on the slopes of the Central Balkan Mountain in Bulgaria with different exposure to the main directions of the world and a variety of soil gleying. The duration of the study is different. During the study period in the 10th-13th experimental years, a relative equality of productivity by habitat was established, with solid and weak soil gleying, respectively, on the low or high part of the slope, especially with eastern and southeastern exposure of the mountain slope. The principle of rhythmicity in Nature (increase or decrease in productivity in even or odd years), fixed in the ancient Bulgarian calendar, finds expression in the manifestations of cultivated grasslands.