Fertilizer Mixing Calculators
> Fertilizer Mixing
If you have referred to our
Fertilizer PPM Calculators, you are aware
of the significance of using those values to control your feeding regimen.
Don't forget however, that while such calculations give you information
about the solution you use, they tell you nothing about just how much nutrition
you are giving your plants overall.
As was discussed in our article on
Feeding by Mass, it is necessary to
think about feeding your plants just as you think about yourself. For
example, you know that as an adult you may need to take in an average of 2000
calories a day to maintain good health and weight. Eat too much at one
meal, and you might back-it-off at the next. You certainly wouldn't
want to eat three, 2000-calorie meals a day, would you? If you think about
a fertilizing as providing "a meal" to your plants, you can apply a similar,
logical approach to your feeding regimen - keeping in mind, of course, that a
watering with plain water - a "flush" - is a "zero-calorie meal.
We believe smaller, more frequent feedings are better, as
they provide an adequate supply of nutrients without the risk of "burning" the
root system. Not only that, but a frequent, dilute solution is pretty
effective at flushing wastes and precipitated minerals from the medium, as well.
Our experience agrees with that of the orchid grower at Michigan State
University that feeding with a 125 ppm N solution two- or three times a week is
a good regimen for a varied collection of actively growing plants. If we
maintained that watering frequency, but occasionally "flushed" the pots with
plain water, that concentration would have to be adjusted to maintain the sail
The calculator below will help you figure out what your
concentration should be, when using your particular supply of fertilizer.
If you use a proportioner, you can use the calculator below to determine
how much fertilizer to mix in your concentrate tank.
One last thing: in all cases, when you see that you are
to mix "X" amount per gallon, the proper mixing is to add the fertilizer, then
fill the container to the gallon mark, not to add the amount to a gallon.