The most popular way to add humus to the soil is with compost.

Mulch is another way to add organic matter to the soil.

Organic mulch breaks down over time further adding to the humus content of the soil.

Organic Soil Preparation Techniques for Better Lawns and Gardens

Earthworms proliferate in a soil with plenty of organic matter.

For large grassy areas, there are lawn aerators that attach to a garden tiller.

Add organic matter

Aerating a lawn

Microbe activity

Organic Soil Preparation Techniques for Better Lawns and Gardens