TABLE 1.

The activity of soil extracellular enzymes involved in carbon (C), nitrogen (N), and phosphorus (P) cycling in the rhizosphere of tomato plants under furrow irrigation (FI) and subsurface drip irrigation (SDI).

Group	Target enzyme	Enzyme activity (nmol substrate g–1 soil h–1)		P-value
		SDI	FI
Carbon cycling enzymes	α-glucosidase	7.9 (1.1)	10.3 (0.7)	0.054
	β-glucosidase	78.3 (3.0)	82.7 (4.6)	0.546
	β-xylosidase	20.0 (3.0)	23.6 (2.5)	0.104
	β-D-cellobiosidase	16.7 (1.6)	19.9 (2.2)	0.369
Nitrogen cycling enzymes	N-acetyl-glucosaminidase	37.9 (0.8)	39.2 (3.1)	0.728
	Leucine-amino-peptidase	40.6 (4.8)	44.2 (6.7)	0.582
Phosphorus cycling enzymes	Acid phosphatase	332.6 (29.6)	323.9 (29.1)	0.599

Numbers in parentheses represent standard error of the mean (n = 3).