a layer of material below the soil surface; materials used to provide plant support. regulate moisture. and (in many cases) provide mineral nutrients to container plants.

Merriam-Webster Online Dictionary
substrate (noun)
1.
- substratum
2.
the base on which an organism lives - the soil is the substrate of most seed plants
3.
a acted upon (as by an enzyme) - substance
substrate (Wikipedia)

Substrate may refer to:

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