Yeah, doesn't say whether it's slow release or not. But, in reality, it actually says 59-4546-0 as the NPK's ratio on the bag, but people on here and another grow forum I go to tell me to disregard it as a misprint, and its really 59-45-46. So I don't know, confuses me heavily. But so far Seedling A is going good, no nute burns or anything. But, on on my Seedling A, there is a slight purpleness on the 2nd set of true leaves after the cotyldons. Now I don't know whether this is due to the 0 ratio for the Potassium causing the purple or an environmental factor, but like I said the whole 59-4546-0/59-45-46 ration thing has got me confused.