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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
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