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• W3040374097 abstract "Greenhouse vegetable cultivation is a substantial source of nitrous oxide (N2O) emissions in China due to intensive managements with nitrogen (N) fertilizers and irrigation water. We hypothesize that reducing input rates of N fertilizers or irrigation water to optimal levels would mitigate N2O emissions without significant loss of vegetable yields. The primary aims of this study are to (i) quantify the variations in vegetable yields, N2O emissions, nitrogen use efficiency (NUE) and crop water productivity (CWP) under greenhouse cultivation conditions; (ii) determine the major regulating factors of vegetable yields, N2O emissions, emission factors (EFs), yield-scaled N2O emissions, NUEs and CWPs; and (iii) evaluate the effectiveness of fertilization and irrigation strategies for N2O mitigation. We compiled a comprehensive dataset from 44 peer-reviewed publications, which includes 408 determinations of seasonal N2O emissions from greenhouse vegetable systems across China between 2006 and 2019. An emission coefficient of 0.95% was obtained as the slope of the linear regression between N2O emissions against N input rates (r2 = 0.480, n = 322, p < 0.001) for treatments that were unfertilized and fertilized with conventional fertilizers. For fruit vegetables, N2O emissions responded to NUEs following a linear-plateau model (r2 = 0.539, n = 115, p < 0.001), which suggests that management practices aiming to increase NUEs are effective for decreasing N2O emissions at NUEs below 0.15 t kg-1. The results of meta-analyses revealed that applications of biochar or enhanced efficiency fertilizers (EEFs) decreased EFs and yield-scaled N2O emissions (ranging from -42% to -34%) but did not significantly increase NUEs. Reducing the input rates of N fertilizers (approximately 50% of the total N input) or irrigation water (approximately 20% of the full irrigation water) provided advantages for maintaining vegetable yields (ranging from -7% to 3%), decreasing N2O emissions (ranging from -68% to -59%), increasing NUEs (ranging from 76% to 157%), and subsequently reducing the reactive N released into the environment." @default.
• W3040374097 created "2020-07-10" @default.
• W3040374097 creator A5020943999 @default.
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• W3040374097 date "2020-11-01" @default.
• W3040374097 modified "2023-10-06" @default.
• W3040374097 title "Nitrogen use efficiency, crop water productivity and nitrous oxide emissions from Chinese greenhouse vegetables: A meta-analysis" @default.
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• W3040374097 doi "https://doi.org/10.1016/j.scitotenv.2020.140696" @default.
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