Effect of elevated CO₂ on growth and yield parameters of groundnut genotypes (Arachis hypozeae L.)

Elevated carbon dioxide is known to impact crop growth and productivity. Groundnut is a very important edible oilseed crop raised mostly under rainfed situations worldwide. in the present study, five cultivars of groundnut (Arachis hypogaea L.) viz., TG 86, TG 84, TG 82, Mallika and Gangapuri were raised in three circular open top chambers at different elevated CO₂ levels as ambient condition (450 & 500ppm) and open atmospheric condition during Kharif 2019 at the research farm, College of Agriculture, Gwalior. to investigate the effect of elevated CO₂ on growth and yield parameters of groundnut Arachis hypozeae L. Groundnut grown in eCO₂ (500 ppm) exhibited significantly higher plant height with maximum number of branches/plants, number of nodules, 50% flowering & 50% maturity. the yield parameters also increased with increasing CO₂ concentration. minimum was recorded in open atmospheric condition. The experiment revealed that among different groundnut genotypes, TG 86 performed best and recorded the maximum yield of kernel, pod and haulm/plant which was statistically at par with TG 84.