| 1 | Sometimes after heavy rain, the water carries the humus down to a river. | |
| 2 | Mixed matrix of sand and red soil give better cuttage effects than that of perlite and humus. | |
| 3 | In ABC soil, the uppermost zone of soil, containing humus; topsoil. | |
| 4 | Then the water will not rush down to the river, and the humus will stay in its place. | |
| 5 | These will stop the force of the wind, and then it cannot blow the humus away. |