The Scientific World Journal

Research Article

Performance Evaluation of Four-Parameter Models of the Soil-Water Characteristic Curve

Table 4

Statistical measures of the models for various soil textural classes.


Soil type	Model	Soil sample 1			Soil sample 2
Soil type	Model		RMSE	Wt.*		RMSE	Wt.*

Sand	BC	0.9878	0.0147	(4)	0.9765	0.0216	(4)
	VG	0.9958	0.0086	(3)	0.9890	0.0147	(3)
	LN	0.9964	0.0080	(2)	0.9909	0.0134	(2)
	MG	0.9972	0.0071	(1)	0.9923	0.0124	(1)

Loamy sand	BC	0.9961	0.0074	(4)	0.9784	0.0125	(4)
	VG	0.9973	0.0061	(1)	0.9898	0.0092	(3)
	LN	0.9962	0.0073	(3)	0.9911	0.0086	(2)
	MG	0.9971	0.0064	(2)	0.9923	0.0080	(1)

Sandy loam	BC	0.9764	0.0113	(4)	0.9838	0.0192	(4)
	VG	0.9931	0.0066	(3)	0.9935	0.0122	(3)
	LN	0.9980	0.0035	(2)	0.9966	0.0088	(2)
	MG	0.9982	0.0034	(1)	0.9974	0.0078	(1)

Silty loam	BC	0.9779	0.0120	(4)	0.9813	0.0220	(4)
	VG	0.9901	0.0080	(3)	0.9939	0.0126	(3)
	LN	0.9938	0.0064	(2)	0.9965	0.0096	(2)
	MG	0.9940	0.0062	(1)	0.9973	0.0083	(1)

Silt	BC	0.9591	0.0294	(4)	0.9529	0.0288	(4)
	VG	0.9797	0.0207	(3)	0.9624	0.0257	(1)
	LN	0.9840	0.0188	(2)	0.9575	0.0273	(3)
	MG	0.9857	0.0178	(1)	0.9608	0.0263	(2)

Loam	BC	0.9909	0.0063	(4)	0.9287	0.0191	(4)
	VG	0.9990	0.0021	(3)	0.9705	0.0131	(3)
	LN	0.9993	0.0018	(2)	0.9826	0.0094	(2)
	MG	0.9995	0.0015	(1)	0.9864	0.0083	(1)

Sandy clay loam	BC	0.9793	0.0120	(4)	0.9906	0.0049	(4)
	VG	0.9810	0.0109	(3)	0.9991	0.0015	(3)
	LN	0.9954	0.0057	(2)	0.9996	0.0010	(2)
	MG	0.9956	0.0053	(1)	0.9999	0.0005	(1)

Silty clay loam	BC	0.9613	0.0105	(4)	0.9959	0.0104	(4)
	VG	0.9795	0.0077	(3)	0.9994	0.0038	(3)
	LN	0.9980	0.0027	(2)	0.9997	0.0028	(2)
	MG	0.9986	0.0022	(1)	0.9998	0.0024	(1)

Clay loam	BC	0.9631	0.0064	(4)	0.9837	0.0039	(4)
	VG	0.9869	0.0038	(3)	0.9932	0.0025	(3)
	LN	0.9942	0.0025	(2)	0.9934	0.0025	(2)
	MG	0.9953	0.0023	(1)	0.9942	0.0024	(1)

Sandy clay	BC	0.9712	0.0096	(4)	0.9794	0.0049	(4)
	VG	0.9928	0.0048	(3)	0.9939	0.0027	(3)
	LN	0.9931	0.0047	(2)	0.9953	0.0023	(2)
	MG	0.9942	0.0043	(1)	0.9965	0.0020	(1)

Silty clay	BC	0.8920	0.0129	(4)	0.9850	0.0094	(4)
	VG	0.9382	0.0105	(3)	0.9924	0.0067	(3)
	LN	0.9564	0.0088	(2)	0.9932	0.0063	(2)
	MG	0.9585	0.0086	(1)	0.9936	0.0061	(1)

Clay	BC	0.9806	0.0077	(4)	0.9859	0.0096	(4)
	VG	0.9968	0.0031	(2)	0.9982	0.0035	(3)
	LN	0.9966	0.0032	(3)	0.9989	0.0028	(2)
	MG	0.9971	0.0030	(1)	0.9989	0.0027	(1)

Values in parentheses are the weightage (Wt.) where a value of one indicates least RMSE value and a value of four indicates largest RMSE value for the data set.