EN
The content of Ca, P, K, Na, Mg, and Beta-Carotene in Rescue Grass, Cocks-foot-grass, and in Italian Ryegrass at three growth stages: before heading /height of plants - 30-40 cm/, at the beginning of heading, and at the beginning of flowering was given. It was found out that the content of phosphorus and potassium decreased in all grasses in the course of the vegetation. There were no such regularities in the content of Ca, Na, and Mg. In regrowths /the second and the third one/ grasses of later haymaking contained more sodium and magnesium, and the content of Ca in grasses in the course of the vegetation increased /II haymaking/ or decreased /III haymaking/. Among grasses Cocksfoot-grass contained the greatest amount of P, K and Mg, Rescue Grass had the smallest amount of Na and Mg, and Italian Ryegrass was characterized by the highest level of Ca and Na. The first swathes of grasses, gathered at the beginning of flowering contained 29% less of Beta-Carotene than before heading /the height of plants - 30-40 cm/. Rescue Grass and Cocksfoot-grass were richer in Beta- -Carotene than Italian Ryegrass.