Table 4 Correlations with the original variables of the PCA components.

From: Biochar addition influences C and N dynamics during biochar co-composting and the nutrient content of the biochar co-compost

Variables

Principal component 1

Principal component 2

pH

 − 0.07

0.36

EC

 − 0.27

0.08

N

 − 0.24

0.11

C

0.17

0.35

C/N

0.21

0.31

Al

0.17

 − 0.21

Ca

0.25

0.19

Fe

0.19

0.22

K

 − 0.30

0.03

Mg

 − 0.30

0.01

Na

 − 0.28

 − 0.04

P

 − 0.12

0.06

Mn

 − 0.20

 − 0.25

RSG_ama

 − 0.03

 − 0.38

RRE_ama

0.21

 − 0.17

GI_ama

0.09

 − 0.37

RSG_cow

 − 0.15

0.02

RRE_cow

0.21

 − 0.01

GI_cow

0.18

 − 0.01

RSG_tom

0.09

0.17

RRE_tom

0.24

 − 0.14

GI_tom

0.26

 − 0.11

RSG_cuc

 − 0.03

0.22

RRE_cuc

0.18

 − 0.13

GI_cuc

0.17

 − 0.05

  1. RSG relative seed germination, RRE relative root elongation, GI germination index, ama amaranth, cow cowpea, tom tomato, cuc cucumber, C/N carbon to nitrogen ratio, EC electrical conductivity.
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