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Effects of low water temperature (T w ) on the rate of light-saturated leaf photosynthesis (P max ), plant water content and sap bleeding rate of rice (Oryza sativa L.) were examined from field trials for 4 years. Cool irrigation water was applied at three temperature levels (16-25 o C in daily average and 20-30 o C in daily maximum) for 20-34 days firstly...
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