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Carbon Dioxide Enhancement Effects in Container- versus Ground-Grown Soybean at Equal Planting Densities

^a USDA-ARS, Plant Science Research Unit and Dep. of Crop Sci., North Carolina State Univ., 3908 Inwood Rd., Raleigh, NC 27603
^b Dep. of Crop Sci., North Carolina State Univ., Raleigh, NC 27695
^c USDA-ARS, Soybean and Nitrogen Fixation Research Unit and Dep. Crop Sci. North Carolina State Univ., 3127 Ligon St., Raleigh, NC 27607. The use of trade names in this publication does not imply endorsement by the USDA or the North Carolina Agricultural Research Service, nor any criticism of similar ones not mentioned

View larger version (28K): [in this window] [in a new window]   Figure 1. (A) Net photosynthetic rates and (B) stomatal conductance values obtained during the reproductive period for both container- and ground-grown soybean in open-top chambers. Bars are ± SE, and the smooth lines are the quadratic fit of the data with the coefficients given in Table 2. Treatments were all charcoal-filtered air (CF) with plants grown in the ground (G) or in 21 L containers (C) at current ambient (370 µmol CO2 mol–1 air) or elevated (700 µmol CO2 mol–1 air) CO2 concentrations.

View larger version (29K): [in this window] [in a new window]   Figure 2. (A) Diurnal root zone maximum, (B) minimum, and (C) diurnal temperature range (DTR). Treatments were all charcoal-filtered air (CF) with plants grown in the ground (G) or in 21-L containers (C) at current ambient (370 µmol CO2 mol–1 air) or elevated (700 µmol CO2 mol–1 air) CO2 concentrations. All temperatures were measured at a depth of about 20 cm.