Figure 3 | Scientific Reports

Figure 3

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

Figure 3

Increase in mean square error (IncMSE%) of variables on impacting the response ratio of (a) yield (RRY), (b) water productivity (RRWP) and (c) nitrogen use efficiency (RRNUE). Response ratio stands for effect size between the treatment and control and is calculated using Eqs. 2–4. Higher IncMSE% means more important. Random forest analysis was used. Variables include initial soil organic carbon (SOC) concentration, mean annual temperature (MAT), total nitrogen input (Nitrogen), total water input (Water), soil texture, and maize planting density (number of plants per hectare, PPH). The out-of-bag error of a, b, and c were 24.1, 23.7 and 32.8%, respectively. Note the different scales among the graphs.

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