Soil Enhancement: Composting
Learn about the difference between “hot” and “cold” methods of composting.
Composting is a method of recycling naturally decomposing matter. Ingredients, size of the pile, local weather conditions, and your maintenance habits will affect the outcome. Note that shredded leaves, chipped wood, and chopped food scraps generally decompose more quickly than whole or large pieces.
Active, or Hot Composting
The quickest way to produce rich garden humus is to create a hot, or active, compost pile. It is called “hot” because it can reach an internal temperature of 160°F (140°F is best) and “active” because it destroys, essentially by cooking, weed seeds and disease-causing organisms. The size of the pile, the ingredients, and their arrangements in layers are key to reaching that desired outcome.
Size: A hot compost pile should be a 3-foot cube, at minimum; a 4-foot cube is preferred. The pile will shrink as the ingredients decompose.
Ingredients for a Compost Pile:
- One part high-carbon materials (shredded, dry plant matter such as leaves, twigs, woody stems, corn cobs)
- One part high-nitrogen green plant matter (green plant and vegetable refuse, grass clippings, weeds, trimmings, kitchen scraps—but avoid meat, dairy, and fat) and good-quality soil
Instructions for Making a Compost Pile:
Pile the ingredients like a layer cake, with 2 to 4 carbon materials on the bottom (twigs and woody stems here will help air to circulate into the pile). Next, add a layer of soil. Add 2 to 4 inches of nitrogen-based materials, followed by soil. Repeat until the pile reaches 2 to 3 feet high.
Soak the pile at its start and water periodically; its consistency should be that of a damp sponge.
Add air to the interior of the pile by punching holes in its sides or by pushing 1- to 2-foot lengths of pipe into it.