Waterlogging was one of the main abiotic stresses affecting maize yield and growth in the North China Plain, while ridge tillage effectually improved soil environment, enhanced crop stress resistance to waterlogging, and increased grain yield of waterlogged maize. In order to explore the responses of nitrogen (N) efficiency and antioxidant system of summer maize to waterlogging stress under different tillage, a field experiment was conducted to explore N use efficiency, leaf activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), and malondialdehyde (MDA) content of waterlogged maize Denghai 605 (DH605) and Zhengdan 958 (ZD958) under different tillage system (ridge planting and flat planting). Our results showed that ridge tillage was beneficial to ameliorate waterlogging damages on antioxidant system by increasing SOD, POD, and CAT activities, and decreasing MDA content. Moreover, ridge tillage significantly increased N efficiency of waterlogged maize. N translocation amount (NTA), N translocation efficiency (NTE), N contribution proportion (NCP), N harvest index (NHI), and N use efficiency (NUE) of waterlogging treatment under ridge planting system (W-V3+R) for DH605 was increased by 108%, 69%, 60%, 8% and 16%, while ZD958 increased by 248%, 132%, 146%, 13% and 16%, respectively, compared to those of waterlogging treatment under flat planting system (W-V3). Ultimately, ridge tillage led to a significant yield improvement by 39% and 50% for DH605 and ZD958, respectively, compared to that of W-V3. In conclusion, ridge tillage was conducive to retard leaf aging, and enhance nitrogen efficiency, thereby resulting in a yield improvement of waterlogged summer maize.

中文翻译：

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不同耕作条件下夏玉米氮素效率和抗氧化系统对涝渍胁迫的响应

涝渍是影响华北平原玉米产量和生长的主要非生物胁迫之一，而垄作有效改善了土壤环境，增强了作物对涝渍的抗逆性，提高了涝渍玉米的籽粒产量。【摘要】：为了探讨不同耕作条件下夏玉米氮(N)效率和抗氧化系统对涝渍胁迫的响应,通过田间试验研究氮的利用效率、叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)、不同耕作制度（垄作和平作）淹水玉米登海605（DH605）和郑单958（ZD958）的过氧化氢酶（CAT）和丙二醛（MDA）含量。我们的研究结果表明，垄作通过增加 SOD、POD、和 CAT 活动，并减少 MDA 含量。此外，垄作显着提高了淹水玉米的氮效率。垄作制度（W-V3+R）下涝渍治理的氮素易位量（NTA）、氮素易位效率（NTE）、氮素贡献比例（NCP）、氮素收获指数（NHI）和氮素利用效率（NUE） DH605较平栽制涝渍处理分别提高108%、69%、60%、8%和16%，而ZD958分别提高248%、132%、146%、13%和16% (W-V3)。最终，与 W-V3 相比，DH605 和 ZD958 的垄作分别显着提高了 39% 和 50% 的产量。综上所述，垄作有利于延缓叶片衰老，提高氮肥利用率，从而提高淹水夏玉米的产量。