Reducing N2O emissions with enhanced efficiency nitrogen fertilizers (EENFs) in a high-yielding spring maize system

文献类型： 外文期刊

第一作者： Lyu, Xiaodong

作者： Lyu, Xiaodong;Lyu, Xiaodong;Wang, Ting;Song, Xiaotong;Xiaotang, Ju;Zhao, Chuanyan;Rees, Robert M.;Liu, Zhan;Siddique, Kadambot H. M.;Siddique, Kadambot H. M.

作者机构：

关键词： N2O emission; Enhanced efficiency nitrogen fertilizers (EENFs); Nitrification inhibitors (NIs); Slow-release fertilizer (SRF); Spring maize; China

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 273 卷

页码：

收录情况： SCI

摘要： Enhanced efficiency nitrogen fertilizers (EENFs), including nitrification inhibitors (NIs) and slow-release fertilizer (SRF), are considered promising approaches for mitigating nitrous oxide (N2O) emissions while improving crop yield. This study investigated the combined application of EENFs with improved water and fertilizer management in an intensively irrigated spring maize rotation over five years in North-western China. High-frequency measurements of N2O fluxes were made throughout each year (both during crop growth and the fallow season) in five treatments: no N fertilizer as a control (CK), conventional N fertilization and irrigation (Con), optimum N fertilization and irrigation (Opt, 33% reduction in N fertilizer and 25% reduction of irrigation water), optimum N fertilization and irrigation with nitrification inhibitor (Opt + NI), and optimum N fertilization and irrigation with slow-release fertilizer (Opt-SRF). Annual mean cumulative N2O emissions reached 0.31 +/- 0.07, 3.66 +/- 0.19, 1.87 +/- 0.16, 1.23 +/- 0.13, and 1.61 +/- 0.16 kg N2O-N ha(-1) for CK, Con, Opt, Opt thorn NI, and Opt-SRF, respectively, with annual mean nitrogen use efficiency (NUE) of 36, 54, 61 and 59% for Con, Opt, Opt thorn NI, and Opt-SRF, respectively. The Opt, Opt thorn NI and Opt-SRF treatments significantly reduced cumulative N2O emissions by 49%, 66%, and 56% (P < 0.05), respectively, and increased NUE by 51%, 70%, and 66% (P < 0.05), respectively, relative to Con. However, mean above-ground N uptake (288-309 kg N ha(-1)) and mean grain yields (12.7-12.8 Mg ha(-1)) did not differ significantly between the Con, Opt, Opt thorn NI, and Opt-SRF treatments during the five-year study. High N2O emissions mainly occurred within a few days of fertilization with irrigation, which could have been produced by microbially-mediated nitrifier or nitrifier denitrification processes. The fallow seasons had significantly lower cumulative N2O emissions, which were mainly attributed to the low temperature, low N inputs of crop residues, and low soil moisture conditions. Our study clearly indicated that the combined application of EENFs with optimum N fertilization and irrigation management can reduce environmental impacts while maintaining high crop yields in dryland regions such as Northwest China. (C) 2020 Elsevier Ltd. All rights reserved.

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