The article presents the results of 12 full vegetation of cucumber plants of the variety “Svyatogor F1” by light culture technology. The studies were conducted on an experimental hydroponic plant at photosynthetic photon irradiance of (200 ± 10) μmol/(s‧m2). The methodological approach to the photobiological studies was developed together with the specialists of the agrotechnical complex “Teplichnoye”. In the experiment, LEDs phyto-irradiators with adjustable radiation spectrum were used, which allowed us to study the effect of the ratio of red (600–700) nm and far-red (700–780) nm radiation levels on the growth, development, and productivity of cucumber plants of the variety “Svyatogor F1”. The results of the experiment showed the greatest efficiency of biometric and productive indicators of these plants on variants of irradiation by LEDs with the addition of far-red radiation to the red at a ratio of levels of the first and second from (30/70) % to (60/40) %; while increasing the proportion of far-red radiation up to 70 % and more inexpedient.
1. Prikupets, L.B. Technological Lighting for Agro-Industrial Installations in Russia // Light & Engineering, 2018, Vol. 26, # 1, pp. 7–17.
2. Prikupets, L. B., Boos, G.V., Terekhov, V. G., Tarakanov, I.G. Optimisation of Lighting Parameters of Irradiation in Light Culture of Lettuce Plants using LED Emitters // Light & Engineering, 2019, Vol. 27, # 5, pp. 43–54.
3. Kozai, T. Smart Plant Factory / Springer Nature Singapore Pte Ltd. 2018, 456 p. ISBN 978-981-13-1064-5; ISBN 978-981-13-1065-2 (eBook); https://doi.org/10.1007/978–981–13–1065–2
4. Dong, C., Fu, Y., Liu, G., Liu, H. Growth photosynthetic characteristics, antioxidant capacity and biomass yield and quality of wheat (Triticum aestivum L.) exposed to LED light sources with different spectra combinations // J. Agronomy and Crop Sci. 2014, Vol. 200, pp. 219–230.
5. Tikhomirov, A.A., Velichko, V.V., Ushakova, S.A. Photobiological efficiency of irradiation of irradiators with LEDs for plant cenoses of different ages in relation to the conditions of closed ecosystems // Light & Engineering, 2022, # 6, pp. 90–96.
6. Waldherr, E., Blakey, R. The phytochrome system: what is the far red for? [Sistema fitokhromov: dlya chego nuzhen dal’niy krasnyy tsvet] // Semiconductor lighting engineering [Polyprovodnikovaya svetotekhnika], 2019, # 5, pp. 46–49.
7. Kalaitzoglou, P., van Ierepen, W., Harbinson, J., van der Meer, M., Martinakos, S., Weerheim, K., Celine, C.S.N., Marcelis, L.F.V. Effects of Continuous or End-of-Day Far-Red Light on Tomato Plant Growth, Morphology, Light Absorption, and Fruit Production // Frontiers in Plant Science, 2019, Vol. 10. Front. Sec. Crop and Product Physiology, https://doi.org/10.3389/fpls.2019.00322.
8. Graig, D.S., Runkle, E.S. An intermediate phytochrome photo-equilibria from night interruption lighting optimal promotes flowering of several long-dayplants // Environ. Exp. Bot. 2015, Vol. 121, pp. 132–138.
9. Rajapaske, N.C., Pollock, R. K., McMahon, M.J., Kelly, J.W, Yong, R.W. Interpretation of light quality measurements and plant response in spectral filter research // HortScience, 1992, Vol. 27, pp. 1208–1211.
10. Lee, M.-J., Son, K.-H., Oh, M.-M. Increase in biomass and bioactive compounds in lettuce under various ratios of red to far-red LED light supplemented with blue LED light // Horticulture Environment and Biotechnology, 2016, Vol. 57, # 2.
11. Davis, P.A., Burns, C. Photobiology in protected horticulture // Food and Energy Security, 2016, Vol. 5, # 4.
12. Kubota, C., Chia, P., Yang, Z., Li, Q. Applications of far-red light emitting diodes in plant production under controlled environments / International Symposium on Advanced Technologies and Management Towards Sustainable Greenhouse Ecosystems: Greensys 2011, Acta Hortic. 952, pp. 59–66, https://doi.org/10.17660/ActaHortic.2012.952.4.
13. Yang, Z.-C., Kubota, C., Chia, P.-L., Kacira, M. Effect of end-of-day far-red light from a movable LED fixture on squash rootstock hypocotyls elongation // Scientia Horticulturae, 2012, Vol. 136, pp. 81–86.
14. Hao, X., Little, C., Zheng, J.M., Cao, R. Far-red LEDs improve fruit production in greenhouse tomato grown under high-pressure sodium lighting // VIII International Symposium on Light in Horticulture, 2016, Acta Hortic. 1134, pp. 95–102.
15. Ayupov, M.R., Rakutko, S.A. On the possibility of adjusting the sodium lamp with LED source to the requirements of light culture [O vozmozhnosti adaptatsii natriyevoy lampy so svetodiodnym istochnikom k trebovaniyam svetokul’tury] // Technologies and technical means of mechanized production of crop production, 2018, Vol. 94, pp. 5–13.
16. Mortensen, L.M.. Stromme, E. Effects of light quality on some greenhouse crops // Scientia Horticulturae, 1987, Vol. 33, pp. 27–36.
17. Avercheva, O.V., Berkovich, Y.A., Erokhin, A.N., Zhigalova, T.V., Pogosyan, S.I., Smolianina, S.O. Features of growth and photosynthesis of Chinese cabbage plants when grown under LED lights [Osobennosti rosta i fotosinteza rasteniy kitayskoy kapusty pri vyrashchivanii pod svetodiodnym osveshcheniyem] // Plant Physiology, 2009, Vol. 56, # 1, pp. 17–26.
18. Chub, V.V., Mironova, O. Yu. Light Absorption by Plants and Bioactive Molecules // Light & Engineering, 2019, Vol. 27, # Speshial Issue, pp. 15–23.
19. Tikhomirov, A.A., Molokeev, M. S., Velichko, V.V. Photobiological efficiency of radiation in the FAR region for radish cenosis using irradiator with LEDs with adjustable spectrum // Light & Engineering, 2024, Vol. 32, # 2, pp. 70–77.
20. Kim, H.-H., Goins, G.D., Wheeler, R.M. et al. Green-light supplementation for enhanced lettuce growth under red-and blue-light-emitting diodes // HortScience, 2004, Vol. 39, # 7, pp. 1617–1622.
21. Smith, H. L., McAusland, L., Murchie, E.H. Don’t ignore the green light: exploring diverse roles in plant processes // Journal of experimental botany, 2017, Vol. 68, # 9, pp. 2099–2110.
22. Prikupets, L.B., Tikhomirov, A.A. Optimization of radiation spectrum in growing vegetables under intensive light culture conditions [Optimizatsiya spektra izlucheniya pri vyrashchivanii ovoshchey v usloviyakh intensivnoy svetokul’tury] // Svetotekhnika, 1992, # 3, pp. 5–7.
23. Sarychev, G.С. Productivity of cucumber and tomato cenoses as a function of spectral characteristics of irradiation system [Produktivnost’ tsenozov ogurtsa i tomata v zavisimosti ot spektral’nykh kharakteristik sistemy oblucheniya] // Svetotekhnika, 2001, # 2, pp. 27–29.
24. Protasova, N.N. Light culture as a way of revealing potential plant productivity [Svetovaya kul’tura kak sposob vyyavleniya potentsial’noy produktivnosti rasteniy] // Plant Physiology, 1987, Vol. 34, p. 4.
25. Tikhomirov, A.A., Ushakova, S.A., Shikhov, V.N., Shklavtsova, E.S. Conceptual approaches to the selection of lamp emission spectrum for plant cultivation in artificial conditions // Light & Engineering, 2019, Vol. 27, Spashial Issue, pp. 24–30.
26. Kurshev, A.E., Bogatyrev, S.D., Zheleznikova, O.E., Chmil, K.A. Research into Irradiation Conditions with LED Phyto-Irradiators in Cucumber Plants Cultivating by Photoculture Technology // Light & Engineering, 2021, Vol. 29, # 3, pp. 56–61.
27. Zheleznikova, O.E., Gorbunov, A.A., Kudashkin, Y.V., Myshonkov, A.B., Prytkov, S.V. LED phyto-installation // Russian patent № 2790314. 2023. Bul. 5.
28. Kusuma, P., Bugbee, B. On the contrasting morphological response to far – led at high and low photon fluxes // Front. Plant. Sci. 2023, Vol. 14.
29. Rakutko, S.A., Rakutko, E.N., Vaskin, A.N. Effect of the ratio of red and far-red radiation on growth and development of tomato seedlings (Solanium Copersium) // International Journal of Applied and Fundamental Research, 2016, # 8, pp. 136–140.
30. Meng Qing-Wu. Spectral manipulation improves growth and quality attributes of leafy greens grown indoors / Ph. D. dissertation, Michigan State University, 2018.

• Previous article
• Next article

• LEDs phyto-irradiator
• radiation spectrum
• photobiological studies
• photosynthetic photon irradiation
• photosynthetically active radiation (PAR)
• cucumber plant
• light culture