The effect of elevated CO2 on shoot biomass, harvest index (HI), shoot N concentration, shoot N content, N harvest index (NHI) of soybean.

Two soybean cultivars, Suinong 14 and Dongsheng 7, were grown Mollisols. Plants were exposed to ambient (aCO2) (380 ppm) or elevated CO2 (eCO2) (580 ppm). Values are means ± standard error of variables across the four replicates, and the statistical significance level P values for the effects of CO2, cultivar, soil and their interaction are shown. SOC, soil organic C.