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

Abstract

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 Climate Change on Rice Production and Local Adaptation Practices Adopted by Farmers in Surkhet, Nepal

“…The study on rice in NARC Tarahara, Nepal also showed that increase in maximum temperature up to 2°C and minimum temperature up to 1°C have positive impact on rice yield but beyond that temperature it has negative impact in rice production (Rai et al, 2014). Similar case was found by a research conducted at Hilly area of Nepal (Lalitpur) that increase in temperature favors rice production till 2°C (Ghimire et al, 2016).…”