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. Author manuscript; available in PMC: 2012 Jan 30.
Published in final edited form as: Environ Pollut. 2010 Nov 27;159(2):401–407. doi: 10.1016/j.envpol.2010.10.033

Fig. 1.

Fig. 1

Concentrations of ammonium (NH4+) in the rhizosphere (a) and bulk soil (b) and concentrations of nitrate (NO3−) in the rhizosphere (c) and bulk soil (d) under elevated CO2 and O3 treatments (V4 = Fourth trifoliate leaf; R4 = Full pod; R8 = Full maturity).