Weekly feed home mixture

If you can't find N, P, and K pre-mixed in fairly equal ratios -
between 10 and 20% each, then check a farm-supply store for bags of
each separately.

For example, you may be able to find 21-0-0 (ammonium sulfate), and 0-
45-0 (triple super phosphate), and 0-0-50 (potassium chloride). If
so, mix 12# 21-0-0 with 4# 0-45-0, and 4# 0-0-50.

That gives you 20# of a 2/1/2 mix, which is the ratio your plants use
the three Macro-Nutrients. Then get an 8 1/2 ounce packet of Micro-
Nutrients from the Foundation's website, and 3# Epsom Salt from your
pharmacy - mix it all together and you have the Weekly Feed mix.

There are numerous other mixes of the "Big Three" nutrients -
sometimes with two of them combines, such as 18-46-0 and 15-0-53. If
you find that, just find some nitrogen and mix enough to get the
2/1/2 ratio, and you're there.