A field experiment was conducted to study the effect of irrigation at different growth stages and nitrogen fertilizer on spring maize growth , yield and water use efficiency . The experiment included eight irrigation treatments : irrigation at the whole growth period (CK ) , no irrigation at seedling stage (I1) , no irrigation at jointing stage (I2 ) , no irrigation at heading stage (I3) , no irrigation at filling stage (I4 ) , no irrigation at seedling stage and heading stage (I13 ) , no irrigation at seedling stage and filling stage (I14 ), no irrigation at jointing stage and heading stage (I24 ) and four nitrogen levels: non-nitrogen (ZN), low nitrogen (LN, 60 kg N/hm ) , medium nitrogen (HN ,120 kg N/hm ), high nitrogen (HN, 180 kg N /hm ) . The results showed that no irrigation in any of the growth stages reduced spring maize plant height, leaf area and grain yield . Irrigation treatment at seedling stage had significant effect on plant height . Nitrogen fertilizer treatment at the whole growth stage had significant effect on the plant height . But water and nitrogen interaction at seedling stage had no significant effect on the plant height . Compared with the treatment of irrigation at whole growth stages (CK) , the treatments I2 and I24 had the greatest impact on plant height, reduced it by 11.42% at most. Irrigation treatments , nitrogen fertilizer treatments and water and nitrogen interaction at the whole growth stage had significant effect on leaf area . However , the effect of no irrigation treatment of the two growth stages on leaf area is greater than no irriga- tion treatment of single growth stage . The effect of no irrigation treatment of single growth stage on leaf area was I4>I3> I1>I2 . The effect of no irrigation treatment of the two growth stages at the nitrogen level ZN , LN was I13>I14>I24 , but at the nitrogen level MN , HN was I24 = I14>Ii3 . Irrigation treatments and nitrogen fertilizer treatments both had signifi- cant effect on l000-grain weight, grain weight per spike and grain yield . Compared with the CK , I3 and I13 had the greatest impact on grain yield , and the largest drop was 28 .76% . I1 and I4 had high yield and water use efficiency at high level of nitrogen fertilizer treatment .%通过大田小区试验,设置8个不同生育期灌水处理:各生育期都灌水(CK)、苗期不灌水(I1)、拔节期不灌水(I2)、抽穗期不灌水(I3)、灌浆成熟期不灌水(I4)、苗期+抽穗期不灌水(I13)、苗期+灌浆期不灌水(I14)、拔节期+灌浆期不灌水(I24)和4个氮肥水平:不施氮(ZN)、低氮(LN,60 kg N/hm2)、中氮(MN,120 kg N/hm2)和高氮(HN,180 kg N/hm2),研究了不同生育期灌水和施氮对春玉米生长、产量及水分利用效率(WUE)的影响.结果表明,任何一个生育期不灌水都降低春玉米的株高、叶面积、籽粒产量;灌水对苗期株高影响不显著,肥对各生育期株高影响均显著,水氮互作效应对苗期株高影响不显著;与处理CK相比较,处理I2和处理I24对株高的影响最大,最高降低了11.42%;灌水,氮肥和水氮互作效应对各生育期叶面积均有显著影响,但两生育期不灌水处理大于单生育期不灌水处理对叶面积的影响;而单生育期不灌水处理对叶面积的影响平均来说为灌水处理I4>I3>I1>I2,两生育期不灌水处理在施氮水平ZN、LN下I13>I14>I24,而在施氮水平MN、HN下处理I14与处理I24差异不显著,却都大于处理I13;灌水和氮素效应对玉米的千粒重、穗粒重、籽粒产量都有显著的影响;与处理CK相比较,处理I3和处理I13对籽粒产量的影响最大,最大降幅为28.76 %;I1和I4高氮处理具有较高的产量和水分利用效率.
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