Elemental Concentrations in Native Range Grasses from the Northern Great Plains of Montana

Abstract

A study of elemental concentrations in five range grasses from the Northern Great Plains of Montana indicated levels of calcium, magnesium, iron, and manganese adequate for optimum performance of range cattle. Concentrations of copper and zinc were below established nutrient requirement levels. Concentrations of these two elements were usually highest in spring samples and decreased throughout the summer and fall. Year-to-year variation was small in spring grass collections for both elements, but summer and fall collections revealed wide fluctuations in elemental levels. For maximum performance of range cattle in the study area, copper and zinc supplements appear to be necessary during summer, fall, and winter grazing seasons.