Why CO₂ control matters in cannabis farming
Carbon dioxide (CO₂) is the fuel for photosynthesis. In a closed cannabis room, plants often deplete CO₂ below ambient levels, slowing growth. By enriching CO₂ in balance with light, temperature, and nutrition, growers can drive faster development, higher yields, and stronger flower quality.
Cannabis absorbs CO₂ quickly during the day. If the canopy pulls levels down to 300–350 ppm, photosynthesis slows. Adding CO₂ restores the gradient and powers growth. Trials show that raising CO₂ from normal air (~400 ppm) to 800–1,200 ppm can increase yield by 30–50% when other factors are in range. Pushing too high, however, delivers diminishing returns and can stress the crop. The key is matching CO₂ with light, VPD, and airflow.
Target ranges by growth stage
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Seedling / Clone: 400–600 ppm. Keep near ambient. Young plants are sensitive
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Vegetative: 800–1,200 ppm. A common range for strong canopy build
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Flowering: 1,200–1,500 ppm. Higher setpoints can support heavy bud formation
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Late Flower: 500–800 ppm. Dropping enrichment protects terpene and resin development
Factors that shape CO₂ response
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Light intensity: Extra CO₂ only pays off under strong PPFD. Weak light = wasted gas
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Temperature and VPD: Slightly warmer canopy with correct VPD makes CO₂ uptake more efficient
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Airflow: Fans and perforated tubing keep CO₂ uniform. Without mixing, stratification creates uneven growth
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Room sealing: Leaks and constant exhaust dump CO₂ and waste money
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Water and nutrition: Enrichment is only effective if roots have the supply to match higher demand
Solar Farm application
At Solar Farm, CO₂ management is part of a GACP program. Each room runs setpoints tied to light levels and growth stage. Sensors log ppm daily, and records link CO₂ profiles with yields. This discipline ensures that cannabis wholesale Thailand and cannabis wholesale Bangkok buyers receive a reliable, premium product backed by audit-ready climate control.
