Abstract: A flow-through oxygen infuser which is an assemblage of one or more venturis, in a chamber, is disclosed. When a venturi(s) is placed in an airtight chamber and water is passed through the venturi(s) a negative pressure is formed in the airtight chamber; additionally a minimal amount of pure oxygen is injected into the chamber generating very small bubbles of oxygen in the water passing through the venturis. The very small oxygen bubbles remain in suspension forming a solution supersaturated in oxygen. A flow-through model for infusing water with oxygen is disclosed. The use of supersaturated water for enhancing the growth of plants is disclosed. Methods for applying supersaturated water to plants in hydroponic culture are described. The promotion of beneficial aerobic bacteria with supersaturated water is described.