Glossary
Short definitions with dedicated, stable URLs.
Alkalinity
The acid-neutralizing capacity of water, commonly influenced by bicarbonates.
DLI
Daily light integral: photosynthetically active photons delivered per square metre each day.
DWC
Deep water culture: roots are suspended in an aerated nutrient solution.
EC
Electrical conductivity: a proxy for the total ionic concentration of a solution.
Kratky Method
A passive method where an air gap develops as plants use a non-circulating reservoir.
Micronutrient
An essential element required by plants in comparatively small amounts.
NFT
Nutrient film technique: a shallow, recirculating solution flows along a root channel.
PH
A logarithmic measure related to hydrogen ion activity in a solution.
Photoperiod
The duration of light and dark within a repeating daily cycle.
PPFD
Photosynthetic photon flux density: PAR photons reaching an area each second.
Substrate
A material that supports roots and influences their access to water and air.
VPD
Vapour pressure deficit: the difference between saturation vapour pressure and actual vapour pressure.