Effect Study of Continuous Monoculture on the Quality of Salvia miltiorrhiza Bge Roots

Table 5

Eigenvalue and variance contribution rate of principal components.

Principal component	Eigenvalue	Variance contribution rate (%)	Cumulative variance contribution rate (%)
F1	4.138	37.617	37.617
F2	2.552	23.202	60.819
F3	2.105	19.132	79.951
F4	1.093	9.935	89.886