< soil scientist enquired if my pot's top dressing was granite gravel. It is (grower and developer grades of chicken grit) and he mentioned the fact that there was no wonder I didn't need to feed micronutrients because all 15 the plants need are made available in the right quantities from the top dressing.> At the risk of sounding like a complete moron, I really have to question the above written by John Lonsdale, last evening. And my apologies before hand when someone proves to me why this can be so. How can micronutrients be derived from granite grit? Especially in a growing season, or even 10 growing seasons for that matter. I can maybe see it if using a sandstone grit, if there is such a thing. All the granite I've ever come across has been an extremely hard rock and not inclined to erosion or break down in which micronutrients would be released, at least not in my life time. Scientifically I am a moron as defined in any dictionary, however this really stuck in my mind and I would like to learn how it is possible, especially in the case of granite. The bag of granite grit #2 that I just picked up has been well washed and there is very little granite dust which could be the source of micronutrients, but even then what would it take to break down the granite dust to release those micronutrients? I had to ask, I've been wrong before and can only stand to learn something when proven wrong! Linda Okotoks, AB Canada BRRRR! Snow is here to stay for a bit, the cold frame is almost packed up for winter, lets hope a deer doesn't walk through it!