The make fertilidust quest never gets satisfied on my quest to-do list, no matter how many times I've made fertilidust. [Sorry, if this is a repeat report of a bug: I've a vague memory of a post addressing it earlier, but I couldn't find it in a search.]
Also I'm not sure if it is a bug, but I've made a lot of powders now and have yet to unlock any upper-level recipes. I don't remember it taking so many repetitions in previous test/reset incarnations.