Variable

Model type

Nugget [Co]

Sill [Co +C]

Range Ao (m)

RSS

r²

RNE [Co/(Co +C)]

ρd (g・cm⁻³)

Gaussian

0.0209

0.1195

12110

1.14E−05

0.978

0.17

SOC (%)

Exponential

0.395

0.791

9530

2.01E−03

0.942

0.50

TN (%)

Exponential

0.234

0.736

12230

2.56E−03

0.935

0.32

AP (ppm)

Exponential

0.89

1.78

21100.00

0.0172

0.64

0.50

pH (H₂O 1/2.5)

Gaussian

0.113

0.553

16460

1.13E−03

0.892

0.20

Elevation (m)

Gaussian

0.0006

0.0636

12210

1.51E−06

0.993

0.01