Dr. S. SRIDHARASHILPA CHERIANDr. NARAYANA S MAVARAKAR2021-12-142021-12-142019-07-18https://krishikosh.egranth.ac.in/handle/1/5810179179Monsoon fluctuations due to El Niño Southern Oscillation (ENSO) have a reflective influence on rice productivity, which is the major foodgrain in India. The impact of ENSO on spatial variability of summer monsoon rainfall was analyzed for the period of 1950-2018 and that on Kharif rice production for the period of 19982016. It was clear from the analysis that El Niño Southern Oscillation had varied influences on rainfall as well as rice productivity over different rice growing districts of Karnataka. It was found that during El Niño (strong, moderate and weak) years, S-W monsoon rainfall was below normal in all the districts of Karnataka wherein, the highest negative deviation from the normal was recorded in Mysuru district (-22.76 %). During the La Niña (strong, moderate and weak) years, S-W monsoon rainfall was above normal in 13 districts in which Bengaluru rural district recorded highest per cent positive deviation (23.46 %). Kharif rice yield was less than normal in 15 major rice growing districts of Karnataka and highest negative deviation from normal was observed in Bidar district (-25.09 %) during El Niño (strong, moderate and weak) years. Kharif rice yield was more than normal in 18 major rice growing districts of Karnataka and highest per cent change from normal was observed in Belagavi district (41.31 %) during La Niña (strong, moderate and weak) years. The correlation between southwest monsoon rainfall and Kharif rice productivity during the El Niño years indicated that August rainfall contributed major share in variations in rice productivity. Analysis of ENSO impact on spatial rice productivity could be useful for formulating farm-level site specific management planning and policy decisions.EnglishThesis