Stones and wood
Black lava rock
Very porous black volcanic rock that holds a little water in its pores and leaves pH neutral.
What the simulation uses
- Holds water
- 15 % by volume
- Water it keeps after draining; the rest runs down to the drainage.
- Pore space
- 50 % by volume
- Room for air and water between grains; low means roots suffocate when wet.
- Weight
- 1000 g/L
- How heavy a litre is.
- pH
- 6.8 to 7.2 pH
- How acid it keeps the soil.
Description
Very porous black volcanic rock that holds a little water in its pores and leaves pH neutral. Moss takes to it readily, a quick way to get green on stone.
Also called black scoria.
Estimated, where sources were thin: look authored for the app; physical values estimated.