Scientists at the University of Mississippi studied Cannabis sativa to determine suitable and efficient environmental conditions for indoor mass cultivation for pharmaceutical uses. Beside studies on the effect of light and temperature, they investigated the influence of CO2.
Cannabis sativa belongs to the so called C3 type of plants. Best climate conditions for growth are at moderate light and temperature regimes. Light above 1500 mmol/m2-sec photosynthetic photon flux densities and temperatures above 30°C inhibits growth. Doubling the atmospheric CO2 concentration, resulted in more tolerance towards dry and hot climate conditions. The yield could be increased up to 30%.