以“郑单958”夏玉米为试材，通过田间小区试验，研究了抽雄期不同倒伏程度对夏玉米叶面积指数（LAI）、产量及其构成因素的影响。结果表明：随生育期推移，LAI逐渐减小，各处理差异显著，严重倒伏的A00处理后期LAI一直最小。随倒伏程度加重，穗长、穗粒数减少，百粒重下降，产量和生物产量降低；同时减产幅度增加，与未倒伏对照处理比较， A60、A45、A30和A00处理分别减产5.8%、24.3%、52.2%和89.9%。研究结果可为夏玉米高产栽培提供参考依据。

Based on a field experiment and “Zhengdan 958” genotype, the effect of different levels lodging on leaf area index (LAI), yield and its components of summer maize were studied. The results showed that LAI of summer maize gradually reduced, which there was significant different at each treatment, with the gowth period went on. LAI was the smallest under severe lodging (A00) conditions. when the degree of lodging increased, ear length, grains per spike and kernel weight decreased, yield and biological yield reduced; at the same time, yield cut rate increased, A60、A45、A30 and A00 treatment cut 5.8%, 24.3%, 52.2% and 89.9%, respectively, compared with the control treatment without lodging. The results would provide reference for high-yield cultivation of summer maize.