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Figure S1. Spatial distribution of APSRU soil reference sites (APSoil).

Figure S2. The range and density of fertilization rate in Australian croplands. The dataset was obtained from Australian Agricultural and Grazing Industries Survey (AAGIS). The surveys were conducted by Australian Bureau of Agricultural and Resource Economics and Sciences (ABARES) based on the ABARES zones. The total records of this dataset were 849.

Figure S3. Semivariograms of annual mean temperature according to the centroid of the CS units.

Figure S4. Semivariograms of annual mean rainfall according to the centroid of the CS units.

Figure S5. Semivariograms of pH according to the centroid of the CS units.

Figure S6. Semivariograms of soil water-holding capacity according to the centroid of the CS units.

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