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在山西省洪洞县霍泉灌区通过大田试验、研究了苗期调亏灌溉对玉米需水规律和水分生产效率的影响。结果表明：调亏处理玉米在苗期、拔节期及抽雄期需水量减少，叶面积、蒸腾速率和光合速率下降，在灌浆期则相对增加，作物的总需水量减少。叶面积、蒸腾速率和棵间蒸发减少是调亏灌溉需水量降低的主要原因。调亏灌溉能够延缓灌浆期叶片衰老，提高光合速率，使光合同化物向籽粒分配的比例增加。调亏灌溉处理产量有所下降，但水分生产效率提高。
Field experiments were conducted in Huoquan Irrigation District, Hongdong County, Shanxi Province to study the effects of regulated deficit irrigation on water requirement and water use efficiency of maize. The results showed that the water requirement of maize reduced, the leaf area, transpiration rate and photosynthetic rate decreased at the seedling stage, jointing stage and tasseling stage, but increased at filling stage, and the total water requirement of crops decreased. Leaf area, transpiration rate and decrease of inter-subsurface evaporation are the main reasons for the decrease of water requirement of regulated deficit irrigation. Regulated deficit irrigation can delay leaf senescence during grain filling, increase photosynthetic rate, and increase photosynthate assimilation rate to grains. Regulated deficit irrigation decreased production, but increased water production efficiency.