| A | B |
|---|
| 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. |
| Cubic Measurement | A system for the measurement of volume or space in cubic units. |
| Density | Mass per unit volume. |
| Drainage | The removal of surplus ground or surface water by artificial means. |
| 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. |
| 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. |
| 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. |
| 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. |
| Acidity | Measure of hydrogen ions in a solution. |
| Aeroponics | A system of hydroponics that involves misting of the roots with a nutrient solution. |
| Aggregate Culture | A hydroponic system that uses a media to absorb the nutrient solution and hold it for the plant. |
| Alkaline | A chemical term referring to a basic solution over a pH of 7. |
| Conductivity Tester | An electronic device used to measure the electrical conductivity. |
| Dissolved Oxygen | The amount of oxygen found in water or solution. |
| Electrical Conductivity | A measurement in hydroponics used to determine the amount of nutrient in solution that is available to a plant. |
| Hydroponics | Growing plants in a nutrient solution and a media other than soil. |
| Media | Soil or soil like material in which plants are grown. |
| Neutral | Having neither acid nor alkaline qualities, pH of 7. |
| Nutrient | An element or compound that is essential for plant growth. |
| Nutrient Flow Technique | A popular water culture technique where the nutrient solution is continuously flowing at the tips of the plants roots set in a medium. |
| pH | A numerical measure of acidity or hydrogen ion activity of a substance such as food or soil. The neutral point is pH 7.0. All pH values below 7.0 are acid and all above 7.0 are alkaline. |
| Perlite | A volcanic glass having numerous concentric cracks that give rise to perlitic structure. Used in greenhouses as a synthetic soil mix. |
| Rockwool | Fibers made of natural or synthetic minerals used as a media for growing plants in a hydroponic system. |
| Soil | The mineral and organic surface of the earth capable of supporting 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. |
| Water Culture | A hydroponic system where the roots are in constant contact with the nutrient solution where the media may not be as absorbent |
