Author(s):

BP Rosalin, Surendranath Pasupalak and Anupama Baliarsingh

Abstract: The present study was conducted in collaboration with Department of Agricultural Meteorology, OUAT and Central Research Farm, Bhubaneswar by undertaking a pot experiment in Open Top Chamber (OTC) to study yield and yield attributes of seven kharif rice cultivators to eCO₂ (476 ppm) during Kharif season, 2012. The experiment was explained by three yield components; panicle numbers/hill, filled grain numbers/panicle and 1000-grain weight under eCO₂ conditions. Yield in eCO₂ OTC was found to be more than open field by 2.08 ghill^-1 (14.5%) associated with increased number of filled grains/panicle (58.8%) and 3.1 ghill^-1 more dry matter production compared to open field. However, decreased panicle numbers/hill (40%) and increased grain chaffyness (147%) attributed towards smaller increase in yield undereCO₂thanopenfieldcondition.So,earlyandmediummaturitycultivarsproducedmoregrainyield than the late maturity cultivars and eCO₂ produced less grain yield than ambient CO₂ by 5.76 ghill^-1.

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