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首页> 外文期刊>Scientific reports. >Optimized split nitrogen fertilizer increase photosynthesis, grain yield, nitrogen use efficiency and water use efficiency under water-saving irrigation
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Optimized split nitrogen fertilizer increase photosynthesis, grain yield, nitrogen use efficiency and water use efficiency under water-saving irrigation

机译：优化的分裂氮肥可以在节水灌溉下增加光合作用，籽粒产量，氮气利用效率和水利用效率

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This study aims to investigate optimization of the basal-top-dressing nitrogen ratio for improving winter wheat grain yield, nitrogen use efficiency, water use efficiency and physiological parameters under supplemental irrigation. A water-saving irrigation (SI) regime was established and sufficient irrigation (UI) was used as a control condition. The split-nitrogen regimes used were based on a identical total nitrogen application rate of 240?kg?ha?1 but were split in four different proportions between sowing and the jointing stage; i.e. 10:0 (N1), 7:3 (N2), 5:5 (N3) and 3:7 (N4). Compared with the N1, N2 and N4 treatments, N3 treatment increased grain yield, nitrogen and water use efficiencies by 5.27–17.75%, 5.68–18.78% and 5.65–31.02%, respectively, in both years. The yield advantage obtained with the optimized split-nitrogen fertilizer application may be attributable to greater flag leaf photosynthetic capacity and grain-filling capacity. Furthermore, the N3 treatment maintained the highest nitrogen and water use efficiencies. Moreover, we observed that water use efficiency of SI compared with UI increased by 9.75% in 2016 and 10.79% in 2017, respectively. It can be concluded that SI along with a 5:5 basal-top-dressing nitrogen ratio should be considered as an optimal fertigation strategy for both high grain yield and efficiency in winter wheat.
机译：本研究旨在探讨液体籽粒产量，氮气利用效率，水使用效率和生理参数的基础敷料氮比的优化。建立了节水灌溉（SI）制度，用充分的灌溉（UI）作为控制条件。所用的分裂氮制度基于相同的总氮施用率为240Ω·kg？1，但在播种和连接阶段之间的四种不同比例分裂;即10：0（n1），7：3（n2），5：5（n3）和3：7（n4）。与N1，N 2和N 4治疗相比，N3治疗在两年内分别增加了5.27-17.75％，5.27-17.75％，5.68-18.78％和5.65-31.02％。通过优化的分裂氮肥应用获得的产量优势可归因于更大的旗叶光合容量和颗粒填充能力。此外，N3处理保持最高的氮气和水使用效率。此外，我们观察到Si的水利用效率与UI相比，2016年增加了9.75％，分别于2017年增加了10.79％。可以得出结论，Si以及5：5的基础敷料氮比应被视为冬小麦高谷物产量和效率的最佳灌溉策略。

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