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Results of the first photobiological studies of op­ timisation of LED phyto irradiators spectrum and irradiance level, when growing salad­greengrocers plants in greenhouses and plant factories in photo­ culture conditions, are presented in the article. The results are given as a series of producing capacity curves for salad and basil plants when irradiating by quasi­monochromatic spectrum for three PAR ranges: blue, green and red. In the experiment, le­ vels of photosynthetic photon irradiance (70 ÷ 230) μmol/s·m2 and of irradiance (13 ÷ 60) W/m2 were varied within a wide range. “Rough” spectra of opti­ cal radiation action estimated over producing capa­ city of plants with different irradiance levels are gi­ ven, and questions of additivity of different spectral radiation influence in forming vegetable biomass are considered. Evaluations of efficiency of various PAR inter­ vals for synthesis of biochemical combinations de­ termining nutrition facts of the studied cultures are performed.

Research into Influence from Different Ranges of PAR Radiation on Efficiency and Biochemical Composition of Green Salad Foliage Biomass