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Nitrogen and CO₂ Affect Regrowth and Biomass Partitioning Differently in Forages of Three Functional Groups

^a USDA, ARS Rangeland Resources Research Unit, 1701 Centre Ave., Fort Collins, CO 80526
^b USDA, ARS, Pasture Systems and Watershed Management Research Laboratory, Bldg. 3702 Curtin Road, University Park, PA 16802
^c USDA, ARS, Northern Great Plains Research Laboratory, PO Box 459, Mandan, ND 58554

View larger version (20K): [in a new window]   Fig. 1. Changes in shoot dry weight of M. sativa, P. smithii, and B. gracilis when grown under high/low (H/L) CO2 and N regimes during the 20 d following defoliation. The vertical bars represent ± standard error of the mean

View larger version (23K): [in a new window]   Fig. 2. Changes in whole plant dry weights of M. sativa, P. smithii, and B. gracilis when grown under high/low (H/L) CO2 and N regimes during the 20 d following defoliation. The vertical bars represent ± standard error of the mean

View larger version (24K): [in a new window]   Fig. 3. Changes in crown dry weight of M. sativa, P. smithii, and B. gracilis when grown under high/low (H/L) CO2 and N regimes during the 20 d following defoliation. The vertical bars represent ± standard error of the mean

View larger version (23K): [in a new window]   Fig. 4. Changes in root dry weight of M. sativa, P. smithii, and B. gracilis when grown under high/low (H/L) CO2 and N regimes during the 20 d following defoliation. The vertical bars represent ± standard error of the mean

View larger version (23K): [in a new window]   Fig. 5. Root:shoot ratio of M. sativa, P. smithii, and B. gracilis when grown under high/low (H/L) CO2 and N regimes during the 20 d following defoliation. The vertical bars represent ± standard error of the mean