Hydroponics
Abbreviations and Units
Table 1: Abbreviations and Units
| Abbreviation | Term | Description |
|---|---|---|
| A | Area | Square feet or square meter. |
| CEA | Controlled Environment Agriculture | Producing plants in a greenhouse or other space. |
| cm | centimeter | A unit of length |
| CWF | Cool White Fluorescent | A type of supplemental lighting |
| DLI | Daily Light Integral | The sum of photosynthetic (PAR) light received by plants in a day. |
| DO | Dissolved Oxygen | Oxygen concentration in nutrient solution measured in parts per million. |
| EC | electrical conductivity | An indirect measurement of the strength of a nutrient solution. |
| HID | High Intensity Discharge | A type of HID supplemental lighting |
| hp | horsepower | A unit of power |
| HPS | High Pressure Sodium | A high intensity discharge lamp/luminaire type for supplemental lighting |
| kPa | kilopascals | A unit of pressure, force per unit area |
| MH | Metal Halide | A type of HID supplemental lighting |
| mol | pronounced 'mole' | A number of anything equal to 6.02 x 1023 items. We use it to quantify the number of photons between 400-700 nm of PAR light plants receive. |
| mol/m²/d | moles per square meter per day | Integrated PAR light |
| mol/m²/s | moles per square meter per second | Instantaneous PAR light |
| nm | nanometer | Unit of length in SI, one billionth of a meter |
| PAR | Photosynthetically Active Radiation | The portion of the electromagnetic spectrum between 400-700 nm plants use for photosynthesis |
| ppm | parts per million | A unit that describes dimensionless quantities such as volume fractions. For describing carbon dioxide concentrations it is a molar basis. |
| SI | System Internationale | International system of units aka metric system - built around 7 basic units of measurements |
| μmol/m²/s | micro-mole per square meter per second | Instantaneous PAR light |
| μS/cm | microsiemens per centimeter | A unit of measurement for electrical conductivity |