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. 2020 Oct 13;4:100063. doi: 10.1016/j.ese.2020.100063

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© 2020 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 9 — The effect size of greenhouse gas emission among different nitrogen compounds and the nitrogen input rate. d-CO₂ is the effect size of carbon dioxide, d-CH₄ is the effect size of methane, and d-N₂O is the effect size of nitrous oxide. NH₄⁺-N represents ammonium, NO_3⁻-N represents nitrate, NH₄NO₃ represents ammonium nitrate, ONF represents organic nitrogen fertilizer. The red point represents the mean effect size of greenhouse gas emission under different nitrogen inputs and nitrogen input rates.