Elevated CO2 increases biomass and tuber yield in potato even at high ozone concentrations
2001
Donnelly, Alison | Craigon, Jim | Black, Colin R. | Colls, Jeremy J. | Landon, Geoff
• Changes in the growth and yield of field‐grown potato (Solanum tuberosum cv. Bintje) induced by season‐long elevated CO₂ and/or ozone concentrations are reported. • Open‐top chambers and unchambered field plots were used to examine crop responses to three CO₂ (ambient, 550 and 680 µmol mol⁻¹) and two ozone (ambient and 65 nmol mol⁻¹, 8 h d⁻¹ seasonal mean) treatments applied throughout the 105 d growing season. • Elevated CO₂ increased both above‐ and below‐ground biomass at intermediate and final harvests. Tuber yield at final harvest was increased by c. 40% due to an increase in mean tuber weight rather than tuber number; tuber yield did not differ significantly between the 550 and 680 µmol mol⁻¹ CO₂ treatments. Elevated ozone had no significant effect on growth or yield except for the largest size category of tubers, despite extensive visible foliar injury. Significant CO₂ × ozone interactions were detected only for senescent leaf number and green leaf ratio. • Elevated CO₂ increases biomass and tuber yield in S. tuberosum cv. Bintje even at high ozone concentrations; these findings are discussed in relation to predicted future atmospheric changes.
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