Phosphorus stress effects on growth and seed yield responses of nonnodulated soybean to elevated carbon dioxide

(...) Growth and seed yield were maximized at the 0.25 and 0.50 mM P concentrations at 350 and 700 μL L −1 CO 2 , respectively. Growth and yield were significantly increased by CO 2 enrichment at all except the lowest P concentration. The stimulation of growth at high CO 2 was consistently associated with increased leaf area, net assimilation rate, P uptake, and P utilization efficiency in the production of dry matter (...)