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Variability in spatial and temporal patterns of herbage production is common in grasslands and can affect land uses, such as grazing.
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Total herbage biomass in northern mixed grass prairie was similar on loamy and sand dune ecologic sites but varied in composition.
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Cool-season grasses were uniformly produced throughout the grazing season, whereas warm-season grasses grew rapidly during August.
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Litter conservation was important for increasing cool-season grass biomass, whereas warm-season grasses remained independent of litter.
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Biomass and composition of herbage in the northern mixed grass varies spatially and intra-annually, affecting seasonal grazing opportunities for livestock.
Professor and Mattheis Chair of Rangeland Ecology and Management, and Director of the Rangeland Research Institute at the University of Alberta, Edmonton, Alberta, Canada, T6G 2P5