Why is soil mixed with waste layers when composting?

Soil contains micro organisms which help to break down the waste material faster.

In addition the soil may also contain some moisture which will help if the compost pile is too dry.

For more information on Bokashi composting.

For more information about composting in general.

Soil is mixed with waste layers to introduce other bacterias/organisms in the soil to further do the composting process. This will make the composting phase faster and more convenient for the one who's doing the composting.

Others introduce composting worms such as Red Wigglers(Esenia Foetida) as well to aid in the composting process.

Here's a page from my profile about composting and using Red Wigglers.

Please check my profile as well.Thanks. Peace...

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