| A | B |
|---|
| Pumice | A porous or spongy form of volcanic glass. |
| Soil | The mineral and organic surface of the earth capable of supporting upland plants. |
| Vermiculite | A mineral, or minerals, classified with the micas, which with treatment at high temperatures, expands into scales, and becomes a loose, absorbent mass. |
| Peat | Fibrous, partly decayed fragments of vascular plants that retain enough structure so that the peat can be identified as originating from certain plants (e.g., sphagnum peat or sedge peat). |
| Perlite | A volcanic glass having numerous concentric cracks that give rise to perlitic structure. Used in greenhouses as a synthetic soil mix. |
| Porosity | Refers to the extent of voids or openings in the soil that exist between soil particles and soil peds or clods. These pores hold water and air for absorption by plant roots. |
| Aeration | The process by which air in the soil is replenished by air from the atmosphere. |
| Bark | The exterior of a woody stem containing phloem tubes and usually some bast fibers. |
| Density | Mass per unit volume. |
| Drainage | The removal of surplus ground or surface water by artificial means. |
| Gypsum | A mineral calcium sulfate, combined with water of hydration. |
| Lime | Calcium oxide, CaO, but, as commonly used in agricultural terminology, calcium carbonate, CaCO3, and calcium hydroxide, Ca(OH)2, are included. Agricultural lime refers to any of these compounds with or without magnesium carbonate, which are used as amendments chiefly for acid soils. |
| Media | Soil or soil-like material in which plants are grown. |
| Fertilizer | Any organic or inorganic material added to soil or water to provide plant nutrients and to increase the growth, yield, quantity, or nutritive value to the plants grown therein. |
| Cubic Measurement | A system for the measurement of volume or space in cubic units. |
