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

Abstract

Results of the first photobiological studies of optimisation of LED phyto irradiators spectrum and irradiance level, when growing salad­greengrocers plants in greenhouses and plant factories in photoculture 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, levels 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 optical radiation action estimated over producing capacity of plants with different irradiance levels are given, and questions of additivity of different spectral radiation influence in forming vegetable biomass are considered. Evaluations of efficiency of various PAR intervals for synthesis of biochemical combinations determining nutrition facts of the studied cultures are performed.

Effects of Light Spectral Quality on the Micropropagated Raspberry Plants during Ex Vitro Adaptation

“…In our experiment, blue light significantly enhanced photosynthetic capacity relative to treatments lacking blue light, which is consistent with other findings, e.g., analyses of Rubisco activity and potential rate of photosynthetic electron transport [ 8 ]. In leafy crops, additivity in combined effects of R and B on plant productivity was observed in lettuce, but not in sweet basil plants [ 16 ].…”

“…Blue light addition to red can improve plant photosynthetic effectiveness [ 13 ]. Furthermore, a combination of red and blue light in certain cases can result in synergetic effects in biomass accumulation [ 16 ]. Green LED light regulates leaf expansion, stem stretching, and stomatal conductance.…”

“…Numerous studies have focused on the role of red, blue, and their combinations in the control of plant growth and development [ 11 , 20 , 21 , 22 , 23 ]. Relatively little research has been done on green light effects [ 16 , 24 , 25 , 26 ]. However, plant physiological responses can be the result of interactions between various light wavelengths; therefore, it is important to include green light in spectral quality studies [ 27 ].…”

The Experimental Research Installation for the Determination of Monochromatic Thresholds of Human Visual System

“…As a result of the first phase of the FBS [1], the region of PPFD in interval of (160-180) µmol/ (s•m²), corresponding to maximum capacity of Landau lettuce and Russian Giant basil, was established. Afterwards, all experiments with red-blue (RB) and red-green-blue (RGB) PE were conducted at PPFD equal to 170 µmol/(s•m²) ±10 %.…”

“…The article [1] presents the results of the first phase of the FBS conducted by the authors using a phytotron in lettuce and basil photo culture (at K.A. Timiryazev RGAU-MSKhA) using the developed special quasi-monochromatic LEDbased phytoemitters (PE).…”