1. A mixture of decaying plants, leaves, and manure; all of which are used to enrich the soil for planting: Every spring, Jim, the farmer, ploughs the compost into the fields to fertilize his crops.
2. A combination or blending: Farmer Jim wants to avoid using chemical compost and to keep using organic compost for his crops.

To change organic materials into fertilizer: Larry plans to compost the leaves from his trees and grass enriching the soil for his backyard garden.

The Nelsons have been composting vegetation for natural farming for many years.