| Since these species originated in a wooded habitat, they require a loose soil with sufficient humus. |
| No writer could pen a single word but for the rich humus of public domain effort with which we garden our notions and conceits. |
| What's left is nutrient-rich organic matter, or humus, which can be used as a soil amendment. |
| Ants love sandy soil so if you add plenty of humus, such as compost, you'll end up with dark, moist, friable soil and no ants. |
| A layer of organic mulch on the surface continually adds soil-building humus, while feeding earthworms that tunnel to aerate the soil. |
| Our map distinctly shows a gradual decrease in humus content of Russian chernozem, beginning far south of the sandy belt. |
