Table 3.
Semivariogram model type, parameters for best fitted model (C 0: nugget; C 1: structural variance; a: range), and cross-validation indicators (r 2: determination coefficient; ME: mean error, NMSE: no dimensional mean square error) of the studied NH4-N, P, and K data sets.
| Lime | Code | Model | C 0 | C 1 | C 0/(C 0 + C 1) | a (m) | r 2 | ME | NMSE |
|---|---|---|---|---|---|---|---|---|---|
| Ammonium nitrogen, NH4 +-N | |||||||||
|
| |||||||||
| First sampling | |||||||||
| 0 | NH4-10 | Spherical | 1.09 | 14.20 | 7.1 | 47.0 | 0.923 | 0.003 | 1.004 |
| 625 | NH4-11 | Spherical | 6.37 | 10.41 | 38.0 | 45.1 | 0.663 | −0.011 | 0.994 |
| 1250 | NH4-12 | Spherical | 13.58 | 19.05 | 41.6 | 68.9 | 0.932 | −0.016 | 0.926 |
|
| |||||||||
| Second sampling | |||||||||
| 0 | NH4-20 | Spherical | 0.00 | 15.57 | 0.0 | 40.9 | 0.876 | −0.003 | 1.147 |
| 625 | NH4-21 | Exponential | 0.00 | 12.25 | 0.0 | 59.5 | 0.912 | −0.005 | 0.992 |
| 1250 | NH4-22 | Exponential | 0.00 | 13.08 | 0.0 | 49.8 | 0.869 | −0.019 | 1.000 |
|
| |||||||||
| Third sampling | |||||||||
| 0 | NH4-30 | Spherical | 1.95 | 24.15 | 7.5 | 53.2 | 0.639 | −0.001 | 0.813 |
| 625 | NH4-31 | Spherical | 0.00 | 33.96 | 0.0 | 71.9 | 0.907 | 0.002 | 0.922 |
| 1250 | NH4-32 | Spherical | 2.60 | 13.92 | 15.7 | 84.6 | 0.972 | −0.008 | 0.937 |
|
| |||||||||
| Phosphorus, P | |||||||||
|
| |||||||||
| First sampling | |||||||||
| 0 | P-10 | Spherical | 0.23 | 1.59 | 12.6 | 51.7 | 0.835 | −0.052 | 1.060 |
| 625 | P-11 | Spherical | 0.61 | 1.54 | 28.4 | 64.0 | 0.836 | −0.003 | 1.020 |
| 1250 | P-12 | Spherical | 0.44 | 2.29 | 16.1 | 53.0 | 0.850 | 0.002 | 0.903 |
|
| |||||||||
| Second sampling | |||||||||
| 0 | P-20 | Spherical | 0.42 | 4.86 | 8.0 | 65.2 | 0.951 | −0.000 | 1.097 |
| 625 | P-21 | Spherical | 0.43 | 6.24 | 6.4 | 47.7 | 0.944 | −0.019 | 0.996 |
| 1250 | P-22 | Spherical | 1.53 | 1.97 | 43.7 | 76.3 | 0.908 | −0.014 | 1.029 |
|
| |||||||||
| Third sampling | |||||||||
| 0 | P-30 | Spherical | 1.41 | 2.30 | 38.0 | 73.9 | 0.976 | 0.002 | 0.848 |
| 625 | P-31 | Spherical | 0.74 | 2.11 | 26.0 | 57.7 | 0.843 | 0.027 | 0.855 |
| 1250 | P-32 | Spherical | 0.89 | 2.25 | 28.3 | 60.0 | 0.912 | 0.001 | 0.941 |
|
| |||||||||
| Potassium, K | |||||||||
|
| |||||||||
| First sampling | |||||||||
| 0 | K-10 | Spherical | 4.97 | 46.74 | 9.6 | 59.7 | 0.861 | 0.011 | 1.184 |
| 625 | K-11 | Spherical | 6.55 | 33.12 | 16.5 | 54.2 | 0.903 | −0.005 | 0.948 |
| 1250 | K-12 | Spherical | 15.96 | 21.35 | 42.8 | 51.4 | 0.925 | 0.013 | 0.901 |
|
| |||||||||
| Second sampling | |||||||||
| 0 | K-20 | Spherical | 6.73 | 18.65 | 26.5 | 65.5 | 0.891 | 0.006 | 0.954 |
| 625 | K-21 | Spherical | 14.61 | 75.20 | 16.3 | 52.3 | 0.887 | 0.049 | 0.863 |
| 1250 | K-22 | Spherical | 16.56 | 43.79 | 27.4 | 58.9 | 0.783 | 0.004 | 0.782 |
|
| |||||||||
| Third sampling | |||||||||
| 0 | K-30 | Spherical | 1.46 | 6.66 | 18.0 | 63.1 | 0.899 | −0.024 | 0.882 |
| 625 | K-31 | Spherical | 2.46 | 3.71 | 39.9 | 68.2 | 0.921 | 0.003 | 1.075 |
| 1250 | K-32 | Spherical | 3.52 | 6.84 | 34.0 | 76.8 | 0.960 | −0.008 | 0.690 |