Covariance Structures in Conventional and Organic Cropping Systems

Table 5

Basic statistics of principal components analyses using three main variables (TY, TYV, and CV%) and six supplementary variables representing Cycle 1 and Cycle 2 of each variable in a long-term field experiment and in each of the conventional and organic cropping systems.

Variable	Long-term experiment			Conventional system			Organic system
	Factor 1	Factor 2		Factor 1	Factor 2		Factor 1	Factor 2
	62.9%	36.3%	Comm.	60.1	39.4	Comm.	52.2	47.1	Comm.
	Loadings			Loadings			Loadings
TY (Mg ha^−1)	−0.99	−0.02	0.98	0.99	0.11	0.99	0.69	0.71	0.99
TYV (Mg ha^−1)^2	−0.76	0.64	0.99	0.82	−0.56	0.99	−0.35	0.93	0.99
CV%	0.57	0.81	0.99	−0.39	−0.92	0.99	−0.98	0.18	0.99
TY-Cycle 1	−0.91	−0.04	0.83	0.88	0.19	0.81	0.57	0.58	0.65
TY-Cycle 2	−0.90	0.002	0.82	0.87	0.003	0.75	0.57	0.60	0.69
TYV-Cycle 1	−0.55	0.70	0.80	0.61	−0.71	0.88	−0.42	0.71	0.68
TYV-Cycle 2	−0.76	0.21	0.62	0.86	−0.04	0.74	0.12	0.60	0.37
CV%-Cycle 1	0.42	0.79	0.79	−0.23	−0.88	0.83	−0.85	0.22	0.77
CV%-Cycle 2	0.15	0.37	0.16	0.15	−0.14	0.04	−0.41	0.17	0.20

Comm.: communality.