Table 2.

Phenolic acid contents in FC and CC rhizosphere soil

Rhizosphere soil sample	p-hydroxybenzoic acid (μg/g)	Vanillic acid (μg/g)	Syringic acid (μg/g)	Cumaric acid (μg/g)	Ferulic acid (μg/g)
FC	0.0554	0.2806	0.0337	0.0204	0.0187
CC	0.1372a	0.3003	0.0590a	0.0385a	0.0303a

Note: ^a was marked for the significant difference within the same column with the T-Student’s method (P < 0.05, n = 3). FC stands for first cropping, and CC stands for continuous cropping