Meta-analysis shows below-ground crop yields increase significantly more than above-ground crops with CO2 enrichment, indicating a research gap.
• Global meta-analysis of 466 observations from 156 CO 2 -enriched greenhouse studies. • Below-ground crops gained 55.0% yield, versus 29.1% in above-ground crops. • Yield-response trends to ΔCO 2 were plotted for different crop groups. • More greenhouse studies are needed on below-ground crops under ΔCO 2 above 650 ppm.
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Sun et al. (2026) studied this question.
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