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Effect of drought stress at reproductive growth stage on the degeneration sterility ripening and nutrient uptake of rice plant



Effect of drought stress at reproductive growth stage on the degeneration sterility ripening and nutrient uptake of rice plant



Research Reports of the Rural Development Administration (Suweon) 31(1 RICE): 36-42



This experiment was conducted to investigate the effect of drought stress treated at the reproductive growth stage on degeneration, sterility, filling and nutrient uptake of rice. Drought shortened culm length, panicle length and degree of panicle exsertion where shortening response was greater at the meiosis stage than at the panicle formation stage when lower internodes was decreased, where as higher internodes at the meiosis stage. Number and degeneration ratio of spikelets and secondary branches were affected due to drought stress. The degeneration ratio of these was responsed higher drought stress of panicle formation stage than meiosis stage. Sterility ratio and impediment of grain filling were also increased. Sizes of unhulled and hulled rice were decreased by drought that remarkably decreased in thickness of grain. The decrease was less when the drought was applied at meiosis stage as compared when the drought was treated at the panicle formation stage. As the duration of drought stress was increased, the total nitrogen content in leaf blade, stem and panicle was increased, but the silicate content decreased. The highest content of nitrogen and silicate was obtained in leaf blade but phosphate and potassium contents were high in stem. There was correlation between ratios of sterility, grain filling and degeneration of spikelets and secondary branches and ratio of silicate to total nitrogen of leaf blade, stem and panicle. These had closer relationship with nutrient contents in panicle than those in leaf blade and stem.

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