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Rice (Oryza sativa L.) is the second most important crop in the world after wheat and also the most important crop in Nepal. The production of rice is influenced by various biotic and abiotic factors. Temperature is the major constraint for the crop yield. The present experiment was conducted to study the impact of temperature on straw and crop productivity from June to October 2014. The experiment was conducted under temperature control chamber, in which temperature was elevated from the ambient level by 2oC and 3oC for the entire crop growth period. Grain and straw yield was measured using electronic weighing machine. Maturity of grain was 10 and 7 days earlier at elevated temperature by 3oC and 2oC respectively. Under similar condition of water depth, plant spacing, rice variety and soil nutrient, rise in temperature up to 2oC is favorable for rice straw yield and crop productivity. Yield loss under elevated temperature by 3oC is due to floret sterility. Further research on temperature resistance rice variety is necessary.

Impact of elevated temperature on rice productivity: A case of Lalitpur, Nepal