Making My Own Weekly Feed Mix Using Micro-Nutrients Purchased from the Foundation Website

Q. I need some help on NPK ratios used with the Micro Mix. The Micro Mix sheet suggested using a 16-16-16 ratio (I can get 17-17-17, will it work?), but the “how to mix your own fertilizer” file and spreadsheet talks about a target 110-60-110
ratio. Which one is best? What is the necessary degree of
exactness/accuracy needed to “feed” successfully (how far can I
diverge from the “ideal’ and still have success?).

A. 17-17-17 will work fine for mixing with the Micro-Nutrient mix you purchased from the Foundation, as will 15-15-15.

Ideally your garden only needs the 110-60-110 ratio of N, P, & K, but the extra phosphate will not hurt your plants. And the pre-mixed Weekly Feed sold throughout Utah and Southern Idaho is 13-8-13, so even 13-13-13 works fine.

We don’t get excited about 10-10-10, because it’s a bit low in N & K, but people use it successfully. It just might require an extra feeding or two during the season.

The 20-20-20 that’s sold in some places is usually quite expensive. This is because the fertilizer is 100% water-soluble, so it can be used in hydroponic operations. That mix can also be used, if you can’t find anything less costly.

I can’t recommend other changes. Certainly the micro-nutrients have proven to be very valuable in growing greatly increased quantities of healthy vegetables.

Look in the Photos section at for pictures of an experiment conducted at the University Del Cauca that shows dramatic differences in crops grown with and without micro-nutrients.