If I remember correctly methx aka methylene urea does not depend a lot on microbial action for N release. I've used it before, straight and in complete fert and love the color and growth. Will release and feed even is cooler temps. Heavy moisture does not affect it. Of course bio N relies on microbes and warm temps and moisture. I'll be getting a blend made consisting of both bio & methx plus urea for this year but want to vary % of each. I was thinking 35% bio and 25% methx in the first half of the year and reversing that in the 2nd half. But I don't actually know if there would be a meaningful turf culture difference or what it would be.