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The Effect of the Irradiation Dose and Time Factors on Producing Capacity of Lettuce and Leaf Vegetables in Photo-Culture Conditions L&E, Vol.30, No.5, 2022

Light & Engineering 30 (5)

Volume 30
Date of publication 10/25/2022
Pages 4–11

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The Effect of the Irradiation Dose and Time Factors on Producing Capacity of Lettuce and Leaf Vegetables in Photo-Culture Conditions L&E, Vol.30, No.5, 2022
Articles authors:
Leonid B. Prikupets, Vladislav G. Terekhov

Leonid B. Prikupets, Ph. D. He graduated with honors from MPEI in 1970. At present, he is the head of laboratory in VNISI by S.I. Vavilov and member of Editorial Board of Svetotekhnika and Light & Engineering Journal

Vladislav G. Terekhov, Ph. D. He graduated with honors from the Moscow State University of Economics, Statistics, and Informatics with a degree in Applied Informatics in Economics. At present, he is General Director of SPC “SVETOKULTURA” and senior researcher of Ltd VNISI named after S.I. Vavilov

Abstract:
Optimisation of the irradiation dose and duration factors in conditions of lettuce-and-leaf vegetable photo-culture matches the goals of development of controllable plant cultivation systems for greenhouses and other protected-ground facilities. Based on the literature of the last years, it is specified that the DLI (Daily Light Integral) factor is paid great attention to in development of sustainable industrial phyto-technology with use of online meteorological and satellite-navigation data. The opportunities of control of the factors under consideration are demonstrated through the example of the author’s experiment in photo-culture conditions of two lettuce cultivars (Frisee and Adamant) made using an automated multi-layer City Farm installation in a room with controlled environment. During the experiment, the variable values of PPFD (photosynthetic photon flux density) in range (180–220) μmol/(m2s), daily photoperiod τф from 13 to 21 hours, vegetation duration t about 24 to 30 days were used with constant VLI, which is the new concept of vegetation light integral (VLI), was introduced similarly to DLI. It is found that the principle of reciprocity of irradiance parameters and time (the Bunsen-Roscoe law) is not met at constant dose. In terms of average producing capacity, it was possible to increase the level of biomass synthesis by 30 % for Frisee lettuce and by 36 % for Adamant lettuce. A series of partial dependences relating producing capacity of lettuce cultivars to DLI, photoperiod, and vegetation duration was obtained (the authors understand producing capacity as biomass over the vegetation period).
The experiment results may be used as input data for the Virtual Agronomist software developed for controlled plant cultivation.
References:
1. Prikupets, L.B., Boos, G.V., Terekhov, V.G., Tarakanov, I.G. Studying of the Affects of Radiation in Different Ranges of PAR Region on Capacity and Biochemical Composition of Biomass of Lettuce and Leaf Vegetables [Issledovaniye vliyaniya izlucheniya v razlichnykh diapazonakh oblasti FAR na produktivnost i biokhimicheskiy sostav salatno-zelennykh kultur] // Svetotekhnika, 2018, # 5, pp. 6–12.
1.a. Prikupets, L.B., Boos, G.V., Terekhov, V.G., Tarakanov, I.G. Research into influence from different ranges of PAR radiation on efficiency and biochemical composition of green salad foliage biomass // Light & Engineering, 2018, Vol. 26, # 4, pp. 38–47.
2. Prikupets, L.B., Boos, G.V., Terekhov, V.G., Tarakanov, I.G. Optimisation of Light Engineering Parameters of Lettuce and Leaf Vegetables Photoculture Using LED Emitters [Optimizatsiya svetotekhnicheskikh parametrov pri svetokulture salatno-zelennykh rasteniy s ispolzovaniyem svetodiodnykh izluchateley] // Svetotekhnika, 2019, # 4, pp. 6–13.
2.а. 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.
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