Single part fertilizers are grainy powders that growers can add directly to their system water in a certain ratio (for example, 1 Tbsp per gallon).
(Take the course here: https://university.upstartfarmers.com/courses/2040-hydroponic-nutrients-fertilizers)
While one-part fertilizers are easier and simpler to use, however, there are two major disadvantages: they are more expensive and growers lose the ability to adjust one nutrient at a time in the solution.
Expense: Because they are pre-mixed, the cost of the labor to mix the fertilizer is usually included in the price of a one-part fertilizer.
Adjustment: Being able to adjust nutrients one by one can be a real benefit. If a water source has a lot of phosphorus in it, for example, it’s good to be able to create a recipe that adds less phosphorus. If the fertilizer is pre-mixed, then the grower loses that ability.
Want to learn more about types of fertilizers, how to mix them, and how to maintain them? Take the Upstart U course, “Hydroponic Nutrients & Fertilizers” and learn all you need to know. https://university.upstartfarmers.com/courses/2040-hydroponic-nutrients-fertilizers
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