Figure 2 | Scientific Reports

Figure 2

From: Determining effects of water and nitrogen input on maize (Zea mays) yield, water- and nitrogen-use efficiency: A global synthesis

Figure 2

An overview of the response ratio of maize (a) yield (RRY), (b) water productivity (RRWP), and (c) nitrogen use efficiency (RRNUE) over the main maize producing countries in the world. Response ratio stands for effect size between the treatment and control and is calculated using Eqs. 2–4. The horizontal line and the red dot (with standard deviation) indicate the median and average values; the limits of the boxes represent the 25 and 75 percentile (lower and upper limit, respectively); and vertical bars represent the 5 and 95 percentile. Note the different scales among the graphs.

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