Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region

Table 2

Correlation matrix between sweet potato performance and soil attributes.

Root yield

Biomass

pH

Na

NH4^+

NO3^−

K

AlkP

AcdP

FDA

MBP

Root yield

−0.54

−0.52

0.08^NS

0.36

0.27^NS

0.00^NS

−0.12^NS

−0.03^NS

−0.05^NS

−0.20^NS

0.05^NS

Biomass

0.07^NS

0.01^NS

−0.17^NS

−0.13^NS

−0.09^NS

0.06^NS

0.11^NS

0.03^NS

−0.01^NS

0.01^NS

pH

−0.18^NS

−0.33

−0.34

−0.21^NS

0.22^NS

−0.12^NS

0.02^NS

0.00^NS

−0.31

Na

0.06^NS

0.48

−0.03^NS

−0.04^NS

0.61

0.56

0.08^NS

0.29

NH4^+

0.69

0.51

0.02^NS

0.14^NS

0.00^NS

0.03^NS

0.4

NO3^−

0.46

0.02^NS

0.42

0.25^NS

0.1^NS

0.38

P

0.27^NS

0.16^NS

−0.01^NS

0.61

0.17^NS

K

−0.03^NS

−0.26^NS

0.24^NS

−0.01^NS

AlkP

0.81

0.17^NS

0.37

AcdP

0.12^NS

0.27^NS

FDA

0.20^NS

MBP

Significance of correlations indicated by , , and is equivalent to  < 0.05,  < 0.01, and  < 0.001, respectively. NS, nonsignificant.