The results indicated that root-divided alternative irrigation could increase root activities, photosynthesis rate and water use efficiency of tobacco leaf, but decrease transpiration rate;
结果表明，分根交替灌溉可增强烟株的根系活力，保持较高的光合速率，降低蒸腾速率，提高叶片瞬时水分利用效率；
Leaf transpiration rate, above ground dry weight and water use efficiency were all decreased under the conditions of low water level.
水分低水位管理蒸腾速率、上部干物重和叶片水分利用效率下降。
Different water managements had an important effect on above ground dry weight, leaf area index, leaf photosynthetic rate, leaf transpiration rate and water use efficiency.
结果表明：不同水分管理方式影响水稻地上部干物重、叶面积指数、光合速率、蒸腾速率和水分利用效率。
Different water managements had an important effect on above ground dry weight, leaf area index, leaf photosynthetic rate, leaf transpiration rate and water use efficiency.
结果表明：不同水分管理方式影响水稻地上部干物重、叶面积指数、光合速率、蒸腾速率和水分利用效率。
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