Willie, I have a big ceramic urn, about five gallons in size that I use, though most folks use a five gallon plastic bucket, or so. I put in a scoop of active compost (leaf mold and manure content mostly), add water from a creek nearby, (water has to be free of chlorine, be it that way from the start or allowed to sit). I don't make my own compost, get it from a friend who buys it commercially. Any active compost they say will do, though they have broken it down to whether your tea is going for vegetables or ornamental plants or lawns, as there is apparently some diversity in whether different plants will be greater wanting more bacteria or more good fungi content for their growth. It can differ with the type of compost. Greater bacteria is good for vegetable I picked up. Added to the mix I put in two tablespoons of molasses to feed the bacteria, and molasses, particularly backstrap, has a lot of good things going for it with plants, two tablespoons of epsom salts for the magnesium, two more of fish powder, and then since I can't find any seaweed emulsion around, I just throw in some crushed up dried seaweed. I might throw in some bamboo leaves to seep in there, as bamboo has good nutrient content. Then I stick in an air hose from my compressor and weight it at the bottom, enough flow for a relatively mild bubbling action. I let it brew like that for 3 three days, mixing it up once or twice a day, but the air action does seem to keep the mix moving about pretty good. After a day or two the mix mostly losses it's smell from the fish powder, and takes on a nice sweet earth yeast odor, not offensive at all, I suspect it is the bacterial activity that does this. It is a very mild smell, I have to stick my nose right on top to smell anything. A friend of mine checked out my garden and started to do the tea too, but he didn't aerate, and his stew really started to smell bad. I believe that you are correct, the aeration supports the aerobic bacteria, which is what you want to have going. Once brewed, within a short time I either strain and use it as a foliar spray, and or ground water with it. Correct, the bacteria will did rather quickly once the aeration is stopped. If spraying, the tea can be diluted for greater coverage. My garden is small, so I just put it on full strength.
I have done a whole lot of reading about how plants process nutrients and stuff, and bacteria are really important for both food transfer and plant growth, defense against pathogens in an antibiotic kind of way, etc, generally speaking, essential for creating a healthful environment for plants to thrive within.
After about a week or so, my plants tend to start to appear sluggish (relatively poor soil), so I give them another shot of the soup and it spurs them right up. i read where foliar spraying of the tea will help plants to increase flowering and setting fruit, and I believe that I have much observed this as well.
What I really like about tis method of fertilization, is that you can't give the plants too much, except if you ground water excessively, and foliar spraying can lead to mold and fungi if not done during the part of the day where the leaves can dry out. I have a little fungi showing up, previously watering at at the end of the day to begin with when first starting doing this. The waste that gets left at the bottom of the brewer, I mix in with the mulch around the plants bases, and it now seems a milder state than when in the only composted form, so the plants haven't shown any problem with the stuff contacting them directly. You can toss it back on the compost heap, but I don't have one currently. Everything gets utilized, and quick and easy to do. Many folks just use a fish tank pump for their air supply. The compost has to be active to begin with, sterilized stuff isn't recommended. i also take a bit of my soil and toss it in too, the dirt being full of bacteria as well, so wanting to enhance what is already there.
A knowledgable guy looked at my plants yesterday and said to me, "I can't believe that you aren't using chemical fertilizers". I have been really attentive about doing the brewing once per week, though some folks do it quite a bit less regularly. i suspect that the frequency required depends on the existing soil conditions.
i totally concur about it being a real plus for poor soil conditions. I am hardly an expert, but my reading up has gone into a lot of different areas, and the benefits are pretty well documented, and my results seem to affirm this.
Oh yeah, lastly, after the tea is brewed I put in a slight amount of the liquid that gets left over from the process of turning bamboo or wood into charcoal. It is sold commercially here. The strong smokey smell is said to repel insects, and it also has nutrient value. It has been used for a long time in Asia as a fertilizer, sold as wood or bamboo vinegar. apparently it has a very similar chemical content to vinegar, hence the name. I don't put it in the brew during the fermenting process, as it has some anti-bacterial content, and not sure if it might be harmful to what has developed in the mix. Some things kill bad bacteria and leave the good ones alone, and it is hard to get clear on what is what I find. I even tried to put some bamboo vinegar on my head to grow more hair, but it isn't working so far.
Said to be good for skin, though.