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Forage Nutritive Value in an Emulated Silvopasture

^a Oregon State Univ., Corvallis, OR 97331
^b Virginia Tech, Blacksburg, VA 24061
^c USDA-ARS ASFRC, Beaver, WV 25813
^d Virginia Tech, Southern Piedmont Agric. Res. and Ext. Center, Blackstone, VA 23824

View larger version (48K): [in a new window]   Fig. 1. Total nonstructural carbohydrate concentrations in response to tree species (HL = honey locust, BW = black walnut) and toe-, mid-, or shoulder- (Sho) slope position in Appalachian silvopastures harvested in May, June, and July in 2002 and 2003. Species effects (P < 0.05) were observed in May and July of 2002 and May and June of 2003. Slope tended (P < 0.10) to affect TNC in June of each year, and species x slope interaction (P < 0.05) was observed in June 2003.

View larger version (20K): [in a new window]   Fig. 2. Forage mineral concentrations (K = mg kg–1 ÷ 10) in response to toe-, mid-, or shoulder-slope position in Appalachian silvopastures harvested in May, June, and July in 2002 and 2003. Calcium, P, and K concentrations were greater (P < 0.05) at toe slopes in 2002.

View larger version (20K): [in a new window]   Fig. 3. Forage mineral concentrations (K = mg kg–1 ÷ 10) in response to low, medium, or high tree density in Appalachian silvopastures harvested in May, June, and July in 2002 and 2003. Calcium and P concentrations increased (P < 0.05) with density in 2002. Concentrations of all minerals increased (P < 0.05) with density over the 2003 season.