if you look at the articles on Ray's website about fertilizers/plant nutrition, they suggest 125 ppm. They're pretty long, technical articles, and deal with a lot of chemistry stuff, but that's the conclusion. apparently a few years ago they did a big controlled study with a number of plants and different fertilizer concentrations, and that gave by far the best results. anyway, I'm trusting the articles for now, and we'll see how it goes!
oscarman, I'm interested in seeing how your side-by-side comparison works out. I was thinking about doing that with the catt I divided, so that I had a control group, but I decided not to for various reasons (among them not having any "standard" potting supplies right now).
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