• Response of Drought Tolerant Rainfed Rice Cultivars to Transplanting Dates Under Changing Climatic Condition in Nawalparasi, Nepal

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  • 01/10/2014

In this MSc. thesis, conducted within SAF-BIN project, Dinesh Bahadur Karki analysed the effects of different transplanting dates on rice cultivars in the SAF-BIN project site Nawalparasi distric, Nepal. His broad objective was to determine the productivity of various drought tolerant rice cultivars and appropriate transplanting dates under changing climatic scenarios. His research focused on the specific objectives to evaluate the growth, phenology and yield of appropriate transplanting dates and drought tolerant rice cultivars and to find out the interaction effect of transplanting dates and drought tolerant rice cultivars on growth, phenology and yield.

In his thesis Mr. Karki comes to the following conclusions:

The grain yield of July 15 and July 25 transplanted rice were recorded statistically superior over August 4 and August 14 transplanted rice under rainfed condition. So under such condition, we can transplant rice up to July 25 by taking any drought tolerant rice cultivar which are tested in the experiment, as the grain yield among cultivars were observed statistically at par. The significant difference in grain yield under different transplanting dates might be due to changing climatic parameters (temperature, rainfall, R.H etc) during the crop growing period. Monsoon rainfall trend of past 15 years of experimental site revealed that the amount of rainfall is in decreasing trend. Due to the less amount of rainfall, the rice crop might face severe water stress during critical growth stages under rainfed condition. For reducing the effect of changing climate on rice production, selection of appropriate transplanting dates might be the farmer's level technology which helps to achieve optimum rice yield by providing favourable growing condition. However, at least two years of multi-location research is needed to validate this research further.