What does compost contain?

Compost produces compost, a light top soil super rich in nutrients and in humus.

The compost comes from decomposed vegetal and usually animal material.

Basically, the vegetal material provides the carbon that the decomposing bacteria need, and the animal material provides the nitrogen it also needs to build cells, although in a much smaller ratio.

Once all the organic material is fully decomposed and transformed into humus, the bacteria die and add their own dead bodies to the amount of nutrients available to the plants when the compost is finally spread on the soil.