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The object of the experiment was to determine the effect of burning and mowing treatments on the composition of Pineland threeawn (Aristida stricta Michx) over a 5-year period. Treatments were control; burning annually; burning in alternate years; and mowing annually and in alternate years both with clippings removed or left on. Annual treatment dates varied from February 20 to March 6. Threeawn samples were analyzed for protein, ether extract, fiber, ash, calcium, magnesium, and phosphorus (P). The grass from all treatments improved in nutritional quality from March to June and decreased from July to the following March. There was a highly significant difference among collection dates in level of all seven nutritional factors, indicating strong seasonal trends. Effect on new growth was greater for protein than for the other factors. Samples collected from all plots 35 days after treatment averaged 5.9% protein, while grass collected 289 days after treatment had 3.8% protein, a reduction of 36%. Forage from threeawn plots either mowed or burned was higher in protein and lower in fiber and P than the control with no differences between the burned or mowed plots. Grass growth after burning approached the recommended minimum protein level for a nursing cow in only a few instances. Ash was lower in grass from the control than from the treated plots. Burning increased P compared to mowing. Threeawn from all treatments lacked sufficient P for good cattle production. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020