So, I went with the top dress application and when the lights came on today I decided to check things out and I thought of your post.
Wth is this "white fuzz" and how is it good?
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EDIT: My bad now I see your pics Lol #facepalm
The white fuzz is mycelium, which are fungal networks (couldn't tell you what species), which are part and parcel of the microbial life you
want in your soil.
How is it good? Basically it's like this--the fuzz, the microbes, the fungus, bacteria, protozoa, amoeba, actinomycetes, arthropods, all of these critters first must consume the nutrients that you've fed into the soil. When they do this, they are mineralizing the nutrients, they are fixing them in their bodies. Then, when they shit or die, those nutrients have been converted into a more bio-available, or plant available form. Sometimes it doesn't stop there, sometimes another microbe has to eat the first microbe, or a macrobe, like an earth worm (or other annelid) consumes then shits. Either way, the nutrients are first fixed, or mineralized, and then they are made available by death or shit.
So in essence, when you see a fungal network like that you know that the soil is alive and it's going to feed your plants.