Productivity of grass species in the dark brown soil zone of Saskatchewan.
In field trials in 1974-83 productivity of 6 Eurasian temperate zone grasses was compared with that of 3 native species. When cut once for hay yields were 3.82. 2.91, 2.84, 2.31, 2.22, 2.08, 2.01, 1.92 and 1.68 t/ha with Thinopyrum intermedium [Elymus hispidus], Agropyron desertorum, Bromus inermis, Psathyrostachys juncea, A. cristatum, B. riparius, Elymus trachycaulus, Pascopyrum [Elymus] smithii and E. lanceolatus, resp. B. riparius and P. smithii gave higher yields when cut 2-3 times per season. In vitro digestibilities of the native grass species were lower than those of the introduced species and it is suggested that this may be due to the more rapid senescence of the native species. Stands of all species were maintained for 10 years except E. trachycaulus which deteriorated after 5 years. Weed infestation was lowest for B. riparius and B. inermis and highest for E. trachycaulus, E. lanceolatus and A. cristatum. Introduced species gave a higher response to N fertilizer application than native species.