Table 4.

Phosphatase, β-glucosidase and dehydrogenase activities in rhizosphere soil and bulk soil

	Phosphatase	β-Glucosidase	Dehydrogenase
Rhizosphere	325 ± 40	320 ± 50	8 ± 1
Bulk soil	130 ± 15	30 ± 2	1.5 ± 0.3

Enzymatic activities measurements and units are described in Experimental procedures. The results are the average of three independent assays performed by duplicate. Data were analysed using STATGRAPHICS Plus Statistical Software (Statistical Graphics, Princeton, NJ, USA) and Student's t-test was used to compare mean values.