Research Reports

Challenge of increasing rice productivity in flood prone areas of Xebangfai flood plain

Growing rice in the villages located along the Xebangfai rever is usually facing to production losses, due to flooding. Flooding is the mean cause of the production losses and cause fluctuation of the rice production in this area up to 50%. However, farmers living in these areas continue growing rice, because it is a deeply ingrained tradition and is part of their life style even with the high risk of production losses. The same practices have been passed on from generation to generation. Up to 
date, the situation remains the same and is rather difficult to change. Therefore, promoting farmers to use submergence tolerant rice varity to grow in flood prone area will help farmers to increase rice productivity and help them live with flooding condition.Two years of the study about flooding in Xebangfai flood plain found that, two kinds of flooding were observed. Flash flood cause the death of rice plants up to 50%, while stagnant flood cause the death of rice plants up to 100%. Interestingly, regular (modern and traditional) rice varieties can survive under flash flood condition up to 2 weeks with water depth of 2 maters, but it can survive under stagnant flood less than 1 week. Futheremore, under stagnant flood of 17 days 
with water depth of 3.3 maters, TDK1-Sub1 showed survival percentage of 80% and gave grain yield of 1.7 t/h, while regular varieties had survival percentage of 20% and gave gain yield of 0.5 t/h. Interestingly, TDK1-Sub1 survived two episodes of submergence for 9 days and 7 days for one month interval in the water depth of 2 maters, and it had survival percentage of 97% with grain yield of 1.4 t/h, while regular rice varieties did not give any production.In dry season 2010-2011, under supporting of NTPC, DSP, 34 farmers were trained to be seed producers and produced about 42.317 kg seed of TDK1-Sub1. Of which, about 40.597 kg was disseminated to 1,791 households who live in 86 villages of 5 districts in order to grow in wet season 2011 to reduce production loss in this coming wet season

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Phetmanyseng Xangsayasane, Phuomi Inthapanya and Nilandon Thavonsouk