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Geranium plants were cultivated in a growth chamber with different light quality and microorganism inoculation conditions. The long-term effect of irradiance quality (LED and fluorescent) as well as two types of microorganism treatments on photosynthetic activity parameters was examined. The maximum reached values of net photosynthesis rate ( P N ), stomatal conductance ( g s ), transpiration rate ( E ) and intercellular CO 2 concentration ( C i ) were afterwards measured in plants cultivated under six colours of light â€“ white, white-blue, blue, red, red-blue and green â€“ emitted by two types of lamp: LED and fluorescent. Two types of microorganism treatments were used: BAF 1 created in the Department of General and Environmental Microbiology and the commonly used Effective Microorganisms (EM) biopreparation. A highest level of P N were found in plants after cultivation under white-blue light (both â€“ fluorescent and LED) and treated by BAF 1 . The positive effect of EM was only noted in the case of plants cultivated under blue-red fluorescent light. Considering plants without microbial inoculation the highest levels were recorded in plants under red and blue light. The comparison of the effect of light quality revealed that in all colours a higher or similar level of net photosynthetic rate was noted in plants under LEDs. Mostly the higher photosynthetic activity was connected with higher stomatal opening as well as with higher transpiration rate, which is especially true for plants cultivated under red and blue LED light.

Effect of Light Quality and Microbiological Inoculum on Geranium (Pelargonium zonale L.) Gas Exchange Parameters