Answer :
Final answer:
The primary ingredient in the decomposition layer of an ecocolumn is humus, which is vital for soil enrichment and plant growth.
Explanation:
The primary ingredient in the decomposition layer of the ecocolumn is humus. Humus is the organic component of soil formed by the decomposition of leaves and other plant material.
In the ecocolumn, the O Horizon is a thin layer predominantly made up of organic material such as leaves and twigs that actively decay into humus.
The decomposed organic matter in humus plays a crucial role in enriching the soil and supporting plant growth by providing essential nutrients.
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