ASK The Experts
Q
I am relatively new to growing and want to know more
about the nutrients involved, particularly how they’re sold.
Why do some come in three parts, others come in two
parts, and there are some brands that are just one part?
—Cristobal S.
When growers are choosing a base nutrient, they will quickly discover there are
one-part, two-part or three-part options.
Although the number of parts vary, they
are all designed to provide plants with the
essential micronutrients, macronutrients
and trace elements needed for healthy plant growth.
The reason why base nutrients are separated into two or
three parts on the store shelves has to do with the chemical
compounds used in the formulation; more specifically, the
calcium source used in the formulation. One-part nutrients use a fully soluble suspension of calcium sulfate. This
form of calcium remains stable even when combined (in
concentrated form) with the other various elements in the
formula. Two- and three-part nutrients always separate the
calcium source from other chemical compounds that may
cause the nutrients (in concentrated form) to coagulate
or otherwise react poorly. This is why the calcium is always
found in part A of a two-part formula or in the first part of
a three-part formula. When using a two-part or three-part
formula, it is important for the grower to dilute part A or
the first part of a three-part formula before adding part B
or the second part of a three-part formula.
A
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Maximum Yield USA | April 2015
So which is best, a one-part, a two-part or a three-part base
nutrient? For many growers, a one-part base nutrient is a good
starting point. The ease of use makes this type of formula
popular with hobby growers. I have seen comparable results
come from one-part, two-part and three-part formulas. In other
words, it is possible to get good results when using any of the
base nutrient options. Two-part or three-part formulas are great
for hydroponic growers or for growers looking for ultimate
control over their feeding regimens. All in all, choosing a base
nutrient comes down to each grower’s personal preference and
what formulation fits best with each particular system.
Keep on Growing,
Eric Hopper
Eric Hopper’s past experience within the indoor
gardening industry includes being a hydroponic
retail store manager and owner. Currently, he
works as a writer, consultant and product tester
for various indoor horticulture companies.
His inquisitive nature keeps him busy seeking
new technologies and methods that could help
maximize a garden’s performance.