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Table 2 Model performance and semivariogram characteristics of exchangeable K, Mg and K–Mg ratio

From: Potassium (K)-to-magnesium (Mg) ratio, its spatial variability and implications to potential Mg-induced K deficiency in Nitisols of Southern Ethiopia

Semivariogram characteristics

K

Mg

K–Mg

Model

Gaussian

Exponential

Exponential

Data transformation

Log

Log

No

Nugget (m) (C0)

0.37

0.11

0.004

Partial sill (m) (C)

0.04

0.07

0.06

Sill (m) (C0 + C)

0.41

0.18

0.064

Lag size

372.16

266.17

124.19

Range (m)

4465.9

1833.8

843.4

Spatial dependence C0/(C + C0) (%)

90

61

6.0

Spatial dependence status

Weak

Moderate

Strong

RMSE

0.86

0.81

0.25

RMSSE

1.03

0.95

1.01

MSE

0.95

0.91

0.25

G (%)

99.0

23.0

100

  1. RMSE root-mean-square error, RMSSE root-mean-square standardize error, MSE mean standard error, G goodness of prediction