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Figure 1

From: Improved soil biological health increases corn grain yield in N fertilized systems across the Corn Belt

Figure 1

Baseline structural models for multilevel structural equation models. The N responsiveness model only included unfertilized check plots and therefore did not include the relative fertilization rate variable in that model. The N fertilizer rate model included all plots (including unfertilized plots). Both relative yield and relative fertilization rate were considered the yield and fertilization rate, respectively, relative to the calculated agronomic optimum. MAP = mean annual precipitation; MAT = mean annual temperature; POXC = permanganate oxidizable carbon; SOC = soil organic carbon.

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