I've not only tried it, I do it every day. My routine goes as follows:
Clean out the roost area of the
chicken tractor, put the scrapings in a 1 gallon
bucket. Fill the bucket with
water, cover it, let it sit in the sun all day. Next day, empty stinky manure water into a 5 gallon bucket, add a couple more gallons and drop the aquarium bubbler into it. (In a couple hours, the anaerobes are killed off and the stink becomes a sweet, earthy smell) Next step is to inoculate this brewing bucket: I take recently collected
mushrooms and whiz them up in a big plastic cup of water with the immersion blender and into the brewer it goes. If I'm fresh out of mushrooms, well then I have to settle for a couple good scoopfuls of leaf litter.
Day 3 is when the biochar gets added. For my 5 gallon brewing bucket, I use about a cup of biochar. I whiz it up with water using the immersion blender, making sure the resulting liquid is ink black with no floating bits. Then into the brew bucket it goes. I usually let this sit a couple hours before applying it, and I apply it anywhere and everywhere -- as a
root drench, foliar application, on top of mulch, under mulch, I want spores+charcoal everywhere.