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An autumn crop of cv. Delphin was subjected to 6 CO2 treatments viz. continuous CO2 levels near 200, 340 (ambient) and 500 p.p.m., intermittent dosing for 8 minutes/40 or in every 104 minutes, and a control (without dosing or filtering). The number of fruits harvested per msuperscript 2 was 60% higher in the 500 p.p.m. than in the 200 p.p.m. treatment, but the average fruit weight was not significantly affected. The dry matter content of the leaves increased, and the SLA and LAR were smaller at higher CO2 concentrations. Vegetative growth tended to decrease at higher CO2 levels, probably because of competition between vegetative and generative organs. The effects of CO2 on setting and yield were less favourable with intermittent than with continuous CO2 enrichment for the same average concentration. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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