In indoor crop production systems, water is vital for crop growth, handy for delivering nutrients and other inputs…and a major cost. As a result, managing every drop of water—and every ounce it carries, whether it’s a biodynamic compost tea or a conventional crop protection product—is critical to maintaining a healthy bottom line.
As closed-system farms become ever more precise, their owners are assessing their choices with an eye toward maximizing precision and efficiency. That has led many to struggle to choose between water-run pumps and venturi injectors for dosing and mixing inputs into their water.
Both water-run pumps and venturi injectors operate on long-established technologies. Water-run pumps use pressure from irrigation flow to lift an injector piston, drawing in a known dose of fertilizer or chemical before it is forced back down by a spring and delivers the dose into a sealed chamber. Injection rates are calculated as a ratio to the flow of irrigation water through the main line.
Venturi injectors use line pressure to constrict flowing water in a conical inlet chamber, then release it into a cone-shaped outlet port. As the flow expands in the outlet port, it creates a vacuum that draws in nutrients, chemicals or air and mixes it thoroughly. Injection in venturi systems is measured in percentages, parts per million, or gallons per acre.
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