A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat, and rice

Maintaining or even increasing crop yields while reducing nitrous oxide (N2O) emissions is necessary to reconcile food security and climate change, while the metric of yield-scaled N2O emission (i.e., N2O emissions per unit of crop yield) is at present poorly understood. Here we conducted a global meta-analysis with more than 6000 observations to explore the variation patterns and controlling factors of yield-scaled N2O emissions for maize, wheat, and rice and associated potential mitigation options. Our results showed that the average yield-scaled N2O emissions across all available data followed the order wheat (322 g N Mg-1, with the 95% confidence interval (CI): 301-346) > maize (211 g N Mg-1, CI: 198-225) > rice (153 g N Mg-1, CI: 144-163). Yield-scaled N2O emissions for individual crops were generally higher in tropical or subtropical zones than in temperate zones, and also showed a trend towards lower intensities from low to high latitudes. This global variation was better e..., , , # A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat and rice

Author: Zhisheng Yao, Haojie Guo, Yan Wang, Yang Zhan, Tianli Zhang, Rui Wang, Xunhua Zheng, Klaus Butterbach-Bahl
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## Description of the Data and file structure

Note: There are six sheets in the dataset. The variable name, unit, and description for each column of each sheet are shown below. The empty cells in this Excel file mean that data are not available.

Variable List:

#### Sheet1: Overview

| Column | Name | Unit | Description |
| :----- | :----------- | :--- | :----------------------------------- |
| A | Full Name | None | Full name of collected parameters. |
| B | Abbreviation | None | Abbreviation of collected parameter. |

#### Sheet2: Maize

| Column | Name | Unit | Description |
| :----- | :---------------------...