Table 4 Evaluation metrics.

Variable	UKF			CKF			ANN			FL
Variable	R²	MAE	RMSE	R²	MAE	RMSE	R²	MAE	RMSE	R²	MAE	RMSE
T	0.78	0.05	0.10	0.99	0.01	0.01	0.95	0.03	0.05	0.79	0.09	0.09
M	0.88	0.12	0.15	0.99	0.01	0.02	0.96	0.07	0.09	0.95	0.09	0.10
EC	0.83	0.19	0.32	0.99	0.01	0.05	0.95	0.10	0.18	0.97	0.15	0.12
pH	0.89	0.06	0.07	0.99	0.02	0.01	0.99	0.02	0.03	0.83	0.09	0.09
N	0.48	0.08	0.15	0.95	0.01	0.05	0.98	0.04	0.03	0.80	0.09	0.09
P	0.49	0.22	0.31	0.90	0.05	0.14	0.98	0.04	0.12	0.92	0.10	0.12
K	0.71	0.09	0.21	0.94	0.02	0.09	0.91	0.03	0.12	0.92	0.10	0.12
CM (MB)	2.18			0.86			4.77			2.29
CT (s)	1.27			0.50			11.13			1.28

T – soil temperature (^oC); M – soil moisture (%); EC – soil electrical conductivity (mS/cm); pH – potential of hydrogen; N – soil nitrogen (mg/kg); P – phosphorus (mg/kg); K – potassium (mg/kg); CM – computation memory (MB); CT – computation time (s).
Significant values are in bold.

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