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How Does Plant Population Density Affect the Yield, Quality, and Canopy of Native Bluestem (Andropogon spp.) Forage?

USDA-ARS, Southern Plains Range Research Station, 2000 18th St., Woodward, OK 73801

View larger version (16K): [in this window] [in a new window]   Fig. 1. Average forage dry matter (DM) yield of Andropogon spp. grown at six plant densities. A line was added to the plot to aid in data interpretation. Each data point is the mean ± SE of 24 experimental units averaged across years and species.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Average crude protein (CP) concentration of Andropogon spp. grown at six plant densities. A line was added to the plot to aid in data interpretation. Each data point is the mean ± SE of 24 experimental units averaged across years and species.

View larger version (16K): [in this window] [in a new window]   Fig. 3. Average plant canopy height of Andropogon spp. grown at six plant densities. A line was added to plot to aid in data interpretation. Each data point is the mean ± SE of 24 experimental units averaged across years and species.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Average culm density of big bluestem and sand bluestem plants grown at six plant densities. A line was added to plot to aid in data interpretation. Each data point is the mean ± SE of 24 experimental units averaged across years and species.

View larger version (21K): [in this window] [in a new window]   Fig. 5. Average leaf density of big bluestem and sand bluestem grown at six plant densities. Data points were slightly offset to eliminate hidden information and lines were added to plot to aid in data interpretation. Each data point is the mean ± SE of 12 experimental units averaged across years.

View larger version (20K): [in this window] [in a new window]   Fig. 6. Average leaf area index of big bluestem and sand bluestem grown at six plant densities. Data points were slightly offset to eliminate hidden information and lines were added to plot to aid in data interpretation. Each data point is the mean ± SE of 12 experimental units averaged across years.