Thekla McDaniels wrote:As Juan says, anaerobic fermentations, whether teas or piles, create substances toxic to plants. The decomposition of your weeds or grass clippings is where this thread starts, but there are micro-organisms participating in the decomposition process. Which micro organisms is determined by the conditions in the broth/pile. The anaerobic organisms make some lethal things, and gasses are lost to the atmosphere as well. Since we all breathe it, my bias is to keep it clean
Thekla
I would dispute the assertion that anaerobic fermentations create substances toxic to plants. Anaerobic fermentations are used extensively in Korean
Natural Farming to good effect.
Furthermore, gassing off of nutrients happens more, not less, in aerobic
composting. This is part of the reason why JADAM (offshoot of KNF) prefers anaerobic composting or fermentation. The other reason is that it's easier and far less time/resource intensive than aerobic composting. You need a container, lid, and water. No airstones or vortex machines necessary. I read how
Paul Wheaton is no longer in favor of aerobic composting, since after all the gassing off and labor turning piles, you end up with 5% of the original volume.
Actively aerated
compost tea is touted to provide more of the "beneficial" microorganisms. You also are supposed to get fewer undesirable ciliates. JADAM says to stop thinking in terms of beneficial or nonbeneficial microorganisms. JADAM says that despite recent advances, we still understand only a tiny fraction of what is happening in the soil.
So we have a bit of a clash between two respected contributors to biology based growing methods. I have to say that aerobic composting seems to be more trouble than it's worth here in dry southern california. My
compost piles dry out instantly, even in the shade. I tried a hugelkulture, but it's a lot of work. Anaerobic fermentation in mostly airtight containers seem like the lowest labor/input nutrient recycling method, the biggest downside being the smell if you don't use sugar (which feels wasteful in its own way).