Table 3. Correlation coefficients between soil soluble salt content, pH or Jerusalem artichoke (NY-1) root length density with urease, invertase or catalase activity in soil.

	Urease	Invertase	Catalase
Soil soluble salt content	−0.18	−0.39**	−0.43**
Soil pH	−0.29*	−0.32*	−0.29*
Root length density	0.41**	0.28	0.42**

Note: *significant at 5% level, **significant at 1% level.