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Diurnal Effects on Nutritive Value of Alley-Cropped Orchardgrass Herbage

^a USDA-ARS, Dale Bumpers Small Farms Research Center, 6883 S. State Hwy 23, Booneville, AR 72927
^b USDA-ARS, Appalachian Farming Systems Research Center, 1224 Airport Road, Beaver, WV

View larger version (21K): [in a new window]   Fig. 1. Diurnal change in mean solar irradiance ( 0.35–2.5 µm) in control (unshaded), and loblolly and shortleaf pine microsites. Data were collected from 0500 to 1930 h (CST) on 1 to 15 June 2000 and 2001. Prediction equations for solar reception were Y = –0.045T – 0.013T2 + 6.60 x 10–3T3 – 5.57 x 10–4T4 + 1.33 x 10–5T5, R2 = 0.99; Y = 0.024T – 0.028T2 + 6.38 x 10–3T3 – 4.58 x 10–4T4 + 1.03 x 10–5T5, R2 = 0.96; Y = 0.018T – 0.034T2 + 8.61 x 10–3T3 – 6.47 x 10–4T4 + 1.50 x 10–5T5, R2 = 0.97 for control, loblolly pine, and shortleaf pine, respectively. T = time (h), CST. Vertical bar indicates LSD (P = 0.05).

View larger version (16K): [in a new window]   Fig. 2. Diurnal change in total nonstructural carbohydrate (TNC) in orchardgrass herbage from control (unshaded), and loblolly and shortleaf pine microsites sampled on 1 through 15 June 2001 and 2002. T = time (h), CST. The error bar at data points indicates standard error of the mean (n = 30).

View larger version (10K): [in a new window]   Fig. 3. Diurnal change in water-soluble carbohydrate (WSC) in orchardgrass herbage sampled on 1 through 15 June 2001 and 2002. T = time (h), CST. The error bar at data points indicates standard error of the mean (n = 90).

View larger version (11K): [in a new window]   Fig. 4. Diurnal change in starch concentration in orchardgrass herbage sampled on 1 through 15 June 2001 and 2002. T = time (h), CST. The error bar at data points indicates standard error of the mean (n = 90).