Fig. 2From: Soil properties changes earthworm diversity indices in different agro-ecosystemBiplot of PCA of 13 different physico-chemical properties of soil, a PC1 vs PC2; b PC1 vs PC3; c PC1 vs PC4. The PC1, PC2, PC3 and PC4 explain 22.96%, 19.37%, 14.23% and 10.10% of variance respectively in datasets. The components with variance less than 10% were excluded. The Varimax rotation with Kaiser Normalization method was used for the extraction of principal componentsBack to article page