Chemical and Biological Technologies in Agriculture

Table 5 Principal components (PCs) or factors and their loading factor values, eigenvalues, and variabilities (%)

From: The impact of the long-term application of mineral nitrogen and sewage sludge fertilizers on the quality of soil organic matter

Parameters	PC1	PC2	PC3	PC4
EE	0.55	0.82	0.17	0.00
TG	0.82	− 0.29	0.48	− 0.06
C_SOM	0.86	0.07	0.40	− 0.31
C_SOM/Nt	− 0.03	− 0.59	0.60	0.54
N_t	0.59	0.34	0.59	− 0.43
PWI	0.90	− 0.31	− 0.25	0.17
C_HWE	0.90	− 0.31	− 0.25	0.17
C_DOC	0.94	− 0.18	0.18	0.22
C_HS	0.36	0.83	0.14	0.41
C_FA	0.04	0.97	− 0.09	0.23
C_HA	0.78	0.42	− 0.45	0.08
C_HA/FA	0.90	− 0.31	− 0.25	0.17
WSA	0.78	− 0.19	− 0.45	− 0.40
Eigenvalue	6.7	3.4	1.8	1.1
Variability (%)	52	26	14	8

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