Compost Tea or Actively Aerated Compost Tea (AACT) as it should be known, is gaining popularity amongst organic practitioners and home gardeners, but finds itself in the midst of controversy over its efficacy. It’s time to take a closer look at this very effective tool in the organic arsenal.
Any discussion of compost, AACT, and organic gardening, should begin with The Soil Food Web. Similar to the food pyramid used for nutritional guidelines for humans, the Soil Food Web is a mapping of the life and interaction of the organisms in healthy biologically active soil. Here organisms eat, live and excrete, and in turn are eaten and excreted by other organisms, producing nutrients for other organisms in the Foodweb and for the plants growing amongst them. So what keeps the Foodweb cycling? Compost. Compost, as most everyone knows, is produced by the decay or breaking down of organic matter by microscopic organisms. It is the foundation of Organic Gardening. Everything necessary for a plant to survive can be found in well made compost. At the basal level, composting really is the process of growing the microorganisms of the Soil Food Web, and organic gardening is the process of reintroducing these organisms back into the soil of our gardens. All compost, however, should not be considered equal. Nature has created very specific regenerative cycles for each of its plant communities, and by following these examples we can effectively create and maintain healthy, biologically diverse soils. I’ll have more on that in upcoming posts.
Ok, so up until now, whether you’ve knew of the Soil Food Web or not, if you use compost to amend your planting beds or topdress your soils, you have been growing and applying the microorganisms necessary to promote plant health. Bravo! You are doing your part to help nature succeed, contributing to the health of our planet and reducing our dependency on chemicals. There is an easier way however, and it’s here that Actively Aerated Compost Tea (AACT) can be a very effective and efficient tool for you.
It’s important to note here, the different techniques using compost and water to apply nutrients to the soil. They are; Compost Leachate, Liquid Compost Extract (LCE), and AACT. To produce Compost Leachate, one simply adds compost to water and lets it sit for a period of time. The resulting liquid is then strained and applied to one’s soils. To produce LCE, one uses the same process as Leachate, but agitates the slurry, either by creating a vortex or aerating (bubbling) the solution to extract the microorganisms and nutrients from the compost. The resulting liquid is then strained and applied.
The process of making Actively Aerated Compost Tea (AACT) uses a small amount of compost in water, and blasts the microorganisms (through aeration) from the organic matter. Foods are then added to the tank, and consumed by the microorganisms. This is the beauty of AACT. When brewed with well made compost, the correct amount of foods and adequate levels of dissolved oxygen, the microorganisms multiply exponentially, and safely, producing a solution rich in microbial activity, that when applied, infuses the soil with the biology necessary to sustain plant life.
In part II, we’ll discuss the some of the organisms of the Soil Food Web, and the process of growing them by brewing AACT.
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