It was verified the impact of irrigation treatments (wet, optimal, dry and very dry) and three potato cultivars on soil microbial community.

The water management was classified into four soil water matric potential mean: -15 kPa (Wet), -25 kPa (Optimal), -30 kPa (Dry) and -45 kPa (Very Dry). The three potato cultivars used were Goldrush (most cultivated mid-season variety in Quebec), Envol (popular early variety), and Red Maria (mid-late to late variety).