After four weeks of cultivation in the greenhouse, after-effect of different
illumination on cucumber was observed. Growth and development of cucumber in
greenhouse was estimated according to the developed leaf number. Significant diffe-
rences were not established, but cucumbers whose transplants grew under module with
the main set of LEDs and modules with supplemental green (520 nm) and orange
(622 nm) light (Fig. 5) had slightly more leaves. Significant after-effect of illumination
on the photosynthesis pigments content of cucumber in greenhouses was not determined.
Slightly more photosynthetic pigments were in leaves of plants, whose transplants grew
under module with the main set of LEDs (Fig. 11 a, b). Chlorophyll a to b ratio was
insignificantly higher in cucumbers whose transplants grew under module with supple-
mental green light and chlorophyll to carotenoids ratio – under module with supple-
mental orange light (Fig. 11 c, d).