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Pakistan Journal of Biological Sciences
Year: 2002  |  Volume: 5  |  Issue: 2  |  Page No.: 169 - 172

Effect of Water Stress at Different Growth Stages on Yield and Yield Contributing Characters of Transplanted Aman Rice

M.T. Rahman, M.T. Islam and M.O. Islam    

Abstract: A pot experiment with four transplanted aman rice varieties was carried out at the Bangladesh Institute of Nuclear Agriculture, Mymensingh during aman season, 2000 to find rice cultivar, which can be used as developing suitable variety for drought affected areas of Bangladesh. Moisture stress (30% FC) was maintained during booting, flowering and grain filling stage and 100% FC in the control plants. Plant height, tiller number, panicle number, panicle length, number of filled grains per panicle, 1000-grain weight, harvest index (HI), total dry matter (TDM) and yield were decreased with stress. However, varieties response was different for most of the characters and they had different degree of reduction. Among the four varieties, Binadhan4 produced highest yield, more tillers and panicles per plant, highest 1000-grain weight and medium TDM and HI under water stress condition. Shorna showed better yield but the highest TDM and medium HI. Brridhan33 showed medium yield and TDM but the highest 1000-grain weight and HI. Binashail showed the highest TDM and plant height. But it produced lower grain yield under stress condition. Binadhan4 and Binashail may be used as developing suitable varieties for drought -affected areas of Bangladesh.

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