Assessment of Climate Change Impact on Rice Using Controlled Environment Chamber in Tamil Nadu, India

Impacts of elevated temperature and carbon dioxide (CO₂) enrichment on rice were assessed by carrying out an experiment with four dates of planting (1 June and 15 June, 1 and 15 July) during 2014 under two different environmental conditions, viz. ambient and modified (climate control chamber) with +4°C compared to the ambient temperature and CO₂ enrichment of 650 ppm. Crops grown under modified environment recorded reduced growth characters (leaf area index, dry matter production, number of tillers m^-2), lesser dry matter partitioning towards grain, yield attributes (number of productive tillers m^-2, number of filled grains panicle^-1) and lower grain yields compared to those grown under ambient condition. Crops subjected to elevated temperature and enriched CO₂ attained panicle initiation, flowering and maturity earlier than those under open ambient condition.