Soil phosphorus sorption capacity dictates the effect of elevated CO ₂ on soil and plant critical phosphorus levels for wheat growth

Background Rising atmospheric CO2 concentrations can increase crop yields; however, it is poorly understood if plants require higher phosphorus (P) inputs to support increased production. In addition, soils with contrasting P-sorption capacities may alter plant response elevated CO2. Aims We examined the effect of on critical soil available P and shoot for growth in capacities. Methods Response curves applications were generated wheat (Triticum aestivum L.) grown a low Sodosol high Ferrosol. Plants 5 weeks under ambient (400 ppm) (800 at nine application rates. The extracted using Olsen, Bray Resin methods analysed. Results Elevated biomass production both soils. Ferrosol but not required achieve maximum Olsen-P decreased Bray-P concentration shoots Conclusions fertilisation depends type. also potentially alters acquisition mechanisms plants, which requires adjustment depending capacity analytical method used assess availability.