Definitions for the key terms, metrics, and concepts used in indoor cultivation — 18 terms
A natural growing medium derived from coconut husks. Popular in hydroponics for its excellent water…
The amount of oxygen held in irrigation water or nutrient solution. Adequate dissolved oxygen…
The cumulative amount of photosynthetically active light received per unit area over 24 hours,…
The percentage of irrigation volume that drains from the substrate. It is used to manage salt…
A measure of dissolved mineral salts in a nutrient solution, expressed in mS/cm. Used to gauge…
A structured approach to pest prevention and control using monitoring, sanitation, cultural…
How evenly light is distributed across the crop canopy. Good light uniformity reduces weak spots,…
The three primary macronutrients for plant growth: Nitrogen (N), Phosphorus (P), and Potassium (K).…
A measure of the oxidizing or reducing capacity of water, used to monitor sanitation strength in…
A scale from 0 to 14 measuring acidity or alkalinity of a solution. Optimal pH in the root zone…
A grow light efficiency metric showing how many usable photons a fixture produces per watt. PPE…
The number of photons in the PAR range hitting a surface per second, measured in μmol/m²/s. The…
A unit measuring nutrient concentration in solution. 1 PPM equals 1 mg per litre. Commonly used…
The temperature around the roots inside the growing medium or nutrient solution. It affects oxygen…
The electrical conductivity of drainage water collected after irrigation. Runoff EC helps growers…
The pH of drainage water after irrigation. Runoff pH helps show whether the root zone is drifting…
The reduction in substrate water content between irrigation events. Dryback is used to steer root…
The difference between the moisture the air can hold when saturated and the amount it currently…