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Regrowth Interval Influences Productivity, Botanical Composition, and Nutritive Value of Old World Bluestem and Perennial Ryegrass Swards

USDA-ARS, Appalachian Farming Systems Research Center, 1224 Airport Road, Beaver, West Virginia 25813

View larger version (42K): [in a new window]   Fig. 1. Mean monthly maximum and minimum air temperatures, monthly precipitation, and 30-yr mean values for each parameter at Beckley, WV.

View larger version (35K): [in a new window]   Fig. 2. Cumulative yield of all herbage in plots sown to old world bluestem (OWB) and perennial ryegrass (PRG) as a function of regrowth interval (RI) during the 2000, 2001, and 2002 growing seasons. Analysis of variance includes RI, species (S), harvest date (H), and the interactions. Each point is the mean of three replicates.

View larger version (35K): [in a new window]   Fig. 3. Cumulative yield of seeded species (old world bluestem [CB] and perennial ryegrass [PRG]) as a function of 2- and 4-wk regrowth intervals (RI) during the 2000, 2001, and 2002 growing seasons. Analysis of variance includes RI, species (S), harvest date (H), and the interactions. Each point is the mean of three replicates.

View larger version (64K): [in a new window]   Fig. 4. Distribution of estimated dry matter (DM) based on sward botanical components as a function of regrowth interval (RI) and time (day-of-year) during the 2000, 2001, and 2002 growing seasons. Analysis of variance includes RI, species (S), harvest date (H), and the interactions.

View larger version (62K): [in a new window]   Fig. 5. Dry matter distribution of sward residual mass (soil surface to 5-cm defoliation height) of old world bluestem (OWB) and perennial ryegrass (PRG) as a function of regrowth interval (RI) during the 2000, 2001, and 2002 growing seasons. Analysis of variance includes RI, species (S), and the interaction.

View larger version (39K): [in a new window]   Fig. 6. Seasonal distribution of available herbage total digestible nutrient (TDN): crude protein (CP) of old world bluestem (OWB) and perennial ryegrass (PRG) as a function of regrowth interval (RI) during the 2000, 2001, and 2002 growing seasons. Analysis of variance includes RI, species (S), harvest date (H), and the interactions.