TABLE 5.

Effect of S32 on the root growth of plants in ES or RS.

Soil	Experimental soil			Reclaimed soil
Treatment	Root length	Root surface area	Root volume	Root length	Root surface area	Root volume
	(cm)	(cm2)	(cm3)	(cm)	(cm2)	(cm3)
S32	57.21 ± 3.56∗	56.63 ± 9.68∗∗	5.99 ± 0.25	33.31 ± 1.65	39.15 ± 5.14∗	3.65 ± 0.23∗∗
PC	34.52 ± 6.25	28.45 ± 5.59	4.50 ± 0.24	26.85 ± 3.26	24.69 ± 3.63	2.62 ± 0.21
NC	25.81 ± 5.65	25.14 ± 8.50	3.96 ± 0.85	22.32 ± 4.15	23.15 ± 3.00	2.45 ± 0.14

ES, experimental soil; RS, reclaimed soil; PC, positive control; B. megaterium As1.223; NC, negative control. ^∗P < 0.05; ^∗∗P < 0.01 compared to NC.