Here is the info I used to make my serum, sometimes referred to as lactobacillus serum, LAB or lacto serum.
https://bocashi.wordpress.com/newspaper-bokashi-instead-of-expensive-bran/
As I previously posted I skip the substrate, newspaper in the above attached website, and use the LAB in liquid form.
I started culturing LAB eight years ago, not five like I previously posted. I started with quart jars in a dough table.
I was looking for away to breakdown lots of invasive plants that would kill the invasives seeds more reliably than hot composting.
i started small fermenting cow parsnip plants I had run through my chipper/shredder. I used one of the black and yellow storage totes that are sold at big box stores.
The results seemed promising. I let the tote age for about a year. The resulting material was much like sphagnum peat moss. I've since scaled up my experiments every couple years.
I wish I would have saved the source for reference, like I said I'm not a good note keeper. I read somewhere lactobacillus is naturally occurring on rice grains. I thought buying gallons of milk to basically dump on piles of shredded leaves could get expensive.
I experimented with skipping the milk. I would make a batch of ricewash, feed it some molasses and let it sit for a month or so then syphon out the middle layer of lacto and use it in the garden.
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The past couple years I ferment my fall leaves in the heavy-duty boxes used for shipping glass beads.
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This how the leaves looked the following year. I don't know how fast the leaves break down. I just let them sit until I was almost ready for the following years leaf clean up.
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It doesn’t show up well in the previous picture but before filling the heavy-duty boxes, called octabins or gaylords, I took out the plastic liners, essentially very large thick plastic bags, and put the octabins in the liners.
I forgot to mention two or three years between using the black and yellow totes, I fermented leaves and grass clippings in plastic leaf bags piled in four car rooftop cargo carriers.
The first year using cargo carriers I only had one. I just piled everything in, including a bunch of Virginia creeper and doused it with LAB. The vines broke down but the long fibers did not fully break down leaving the material stringy.
I then acquired three more cargo carriers to use for fermenting.
The cargo carriers worked but did not have the volume I was shooting for, also, transferring leaves from the shredder bag to the plastic bags was a PITA. Instead of tying the bags closed I just rolled up the top and put a few rocks on them inside the cargo carriers.
Late one Spring I opened a cargo carrier only to discover it was home to thousands of BSF larve, probably hundreds of thousands. Apparently I had not closed the bags tight enough and some adult BSF had found their way in. This was before I had chickens.
Back to the octabins. They worked fairly well as bokashi bins, they were free and held a decent amount of yard waste, approximately ¾ yard each. The down side was that they were only good for one batch of bokashi and they looked pretty ragged by the next spring. The bottom half would be a soggy mess. I guess I could have dried them and ran them through the chipper.
This year I'm trying a windrow style bokashi pile. I got the idea from this video.