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. 2022 Mar 4;8(3):e09050. doi: 10.1016/j.heliyon.2022.e09050

Table 2.

Calibration and validation results to predict some soil properties.

Soil properties	Calibration set (n = 776)			Validation set (n = 3106)
Soil properties	R²	RMSE	RPD	R²	RMSE	RPD
pH	0.86	0.3	2.7	0.83	0.40	2.4
Available P (mg kg^-1)	0.31	28.2	1.2	0.25	36.1	1.2
Exchangeable K (cmol_c kg^-1)	0.46	151	1.4	0.32	159	1.2
Exchangeable Ca (cmol_c kg^-1)	0.95	650	4.4	0.95	738	3.9
Exchangeable Mg (cmol_ckg^-1)	0.85	235	2.6	0.84	256	2.6
Exchangeable Na (cmol_c kg^-1)	0.25	38.2	1.2	0.52	17.8	1.5
SO4–S (mg kg^-1)	0.43	3.2	1.3	0.37	4	1.3
OC (%)	0.92	0.3	3.6	0.91	0.4	3.4
TN (%)	0.96	0.03	4.8	0.92	0.04	3.4
Extractable Fe (mg kg^-1)	0.76	38.3	2.1	0.65	39.3	1.7
Extractable Zn (mg kg^-1)	0.66	1.8	1.7	0.50	2.7	1.4
Extractable B (mg kg^-1)	0.59	0.2	1.6	0.6	0.2	1.6
Extractable Mn (mg kg^-1)	0.48	36.17	1.4	0.42	48.3	1.3
Extractable Cu (mg kg^-1)	0.65	1.1	1.7	0.55	1.2	1.5
Extractable Mo (mg kg^-1)	0.27	0.6	1.1	0.35	0.55	1.2
CEC (cmol_c kg^-1)	0.94	4.6	4.0	0.92	5.4	3.5