New to some of this but i have some friends that swear that the soil be a certain temp (summer temps) for microbial based fertilizers to be effective. How warm does it need to be? I would assume that most ferts with mychorrizal fungi attached would be good for actively growing turf or ornamentals. So soil temps in the 55-65 range, right? I'm talking about manufactured organic fert not horse manure. So no horses*%$ answers.