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The objective of this study was to determine tbe variability of Ca, Mg, K, Cu, Zn, and K/(Ca+Mg) ratio in ‘Jose’ tail wheatgrass [TMnopyrum ponticunr (Podp.) Barkw. & D.R. Dewey& ‘Luna’ pubescent wheatgrass [T. intermedium subsp. burbulcltum (Scbur.) Barkw. & D.R. Dewey], and ‘Hycrest’ crested wheatgrass [Agropyron c&&m (L.) Gaertn. X A. desertorum (Fiscb. ex Link.)]. Each grass was grown alone and in paired rows with ‘Renumex’ sainfoin (Onobrychis wicvoliu Stop.) on a Pulbnan clay loam soil (a fine, mixed tbermic Torrertic Paleustoii). Each species or mixture was evaluated under 3 cutting schedules In 1985 and 1986 and their mineral concentrations were compared to the recommended daily requirements of beef cattle. Tbe concentration of minerals was similar in grasses grown as monocultures and in binary mixtures. The concentrations of all minerals and the ratio varied with harvest time, pbenological stage, and year. Therefore, seasonal dynamics of mineral concentrations should be kept in mind when evaluating the mineral status of different forages. Among grasses, Hycrest bad a better mineral profile for beef cattle than Luna or Jose. Sainfoin bad higher concentrations of Ca, Mg, Cu, and Zn and much lower K/(Ca+Mg) ratio than the grasses. Hence, sainfoin-Hycrest mixtures may provide mineral concentrations more in balance with beef cattle requirements and help alleviate the problem of bypomagnesemia.

Variability for Ca, Mg, K, Cu, Zn, and K/(Ca + Mg) Ratio among 3 Wheatgrasses and Sainfoin on the Southern High Plains