LED Supplementary Lighting

2018 ◽

Author(s):

A.V. Korchagin

Keyword(s):

Рассмотрены различные аспекты производства рассады цветочных культур, позволяющие достигнуть высокого качества продукции: правильный выбор посевного материала, механизация производства, досветка растений и применение регуляторов роста, использование готовых сеянцев.Various aspects of the production of flower seedlings to achieve high product quality are considered: the right choice of seeds, mechanization of growing, supplementary lighting of the plants and the application of growth regulators, the use of ready-made seedlings.

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Applications and Development of LEDs as Supplementary Lighting for Tomato at Different Latitudes

Agronomy ◽

10.3390/agronomy11050835 ◽

2021 ◽

Vol 11 (5) ◽

pp. 835

Author(s):

Onofrio Davide Palmitessa ◽

Marco Antonio Pantaleo ◽

Pietro Santamaria

Keyword(s):

High Tech ◽

Greenhouse Production ◽

Climate Conditions ◽

The Sustainable Development ◽

Agenda 2030 ◽

Middle Latitudes ◽

Power Load ◽

Supplementary Lighting ◽

Zero Hunger ◽

Incandescent Lamps

High-tech greenhouses and artificial light applications aim to improve food production, in line with one of the sustainable development goals of the UN Agenda 2030, namely, “zero hunger”. In the past, the incandescent lamps have been used for supplementary lighting (SL) at higher latitudes to increase greenhouse production during the dark season. Light-emitting diodes (LED) have been replacing gas discharge and incandescent lamps, and their development is expanding SL applications in different agricultural scenarios (e.g., urban farming, middle latitudes). In fact, recent research on LED applications in Mediterranean greenhouses have produced encouraging results. Since middle latitudes have a higher daily light integral (DLI) than higher latitudes in the dark season and climate conditions influence the installed power load of greenhouses, LED installation and management in Mediterranean greenhouses should be different and less expensive in terms of investment and energy consumption. Accordingly, the aim of this review is to outline the state of the art in LED applications and development, with a focus on latitude-related requirements. Tomato was used as a representative crop.

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Effect of Supplementary Light Source on Quality of Grafted Tomato Seedlings and Expression of Two Photosynthetic Genes

Agronomy ◽

10.3390/agronomy8100207 ◽

2018 ◽

Vol 8 (10) ◽

pp. 207 ◽

Cited By ~ 6

Author(s):

Hao Wei ◽

Jiangtao Hu ◽

Chen Liu ◽

Mengzhao Wang ◽

Jin Zhao ◽

...

Keyword(s):

Light Source ◽

Photon Flux ◽

Photon Flux Density ◽

Light Sources ◽

Seedling Production ◽

White Leds ◽

Tomato Seedlings ◽

Photosynthetic Genes ◽

Supplementary Lighting

Supplementary lighting is commonly used in high-quality seedling production. In this study, grafted tomato seedlings were grown for 10 days in a glasshouse with 16-h daily supplementary lighting at 100 μmol·m−2·s−1 PPFD (Photosynthetic photon flux density) from either high-pressure sodium (HPS), metal halide (MH), far-red (FR), white LEDs (Light emitting diodes) (W), or mixed LEDs (W1R2B1, where the subscript numbers indicate the ratio of the LED chips) to determine which light sources improve the seedling quality. The control seedlings did not receive any supplementary light. Physiological parameters and the expression of genes related to photosynthesis were analyzed. The results showed that root length, biomass, number of leaves, chlorophyll (SPAD), scion dry weight to height ratio (WHR), and specific leaf weight (SLW) were the greatest for grafted seedlings grown in W1R2B1. The level of root ball formation was the greatest for seedlings grown in W1R2B1, followed by those grown in W, HPS, and MH. Seedlings grown in FR did not fare well, as they were very thin and weak. Moreover, the expression of two photosynthetic genes (PsaA and PsbA) was significantly increased by W1R2B1 and W, which suggests that the plastid or nuclear genes might be regulated. The overall results suggest that W1R2B1 was the most suitable light source to enhance the quality of grafted tomato seedlings. The results of this study could be used as a reference for seedling production in glasshouses, and may provide new insights in the research on lights affecting the development of plants.

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Light and Temperature Control for Greenhouse Plant Growth

Engineering Technologies and Systems ◽

10.15507/2658-4123.031.202101.008-020 ◽

2021 ◽

Vol 31 (1) ◽

pp. 8-20

Author(s):

Saken K. Sheryazov ◽

Svetlana A. Popova

Keyword(s):

Control System ◽

Energy Consumption ◽

Mathematical Models ◽

Temperature Control ◽

Control Algorithm ◽

Block Diagram ◽

Control Plant ◽

Reduce Energy Consumption ◽

Supplementary Lighting ◽

Growing Conditions

Introduction. The article deals with the conditions for growing greenhouse plants. Supplementary lighting supports the process of plant photosynthesis and the microclimate in the greenhouse. The authors suggest the ways to reduce energy consumption in greenhouses by controlling the microclimate and process of supplementary lighting in greenhouses. Materials and Methods. Special lighting and temperature are required for growing greenhouse plants. A method of efficient plant growing is light and temperature control. The development of a control algorithm requires the mathematical models that relate the process of photosynthesis to the microclimate parameters. There are given the mathematical models based on the experimental data. Results. The control system and algorithm to control plant-growing conditions have been developed to maintain the greenhouse microclimate. LED lamps are used to control the lighting process. The authors present the developed block diagram of the control system, which contains four channels responsible for the main energy-intensive microclimate factors. The description of the algorithm of the greenhouse light-temperature control is given. Discussion and Conclusion. In conclusion, the need to maintain the greenhouse microclimate and supplementary lighting with the different radiation spectrum for the efficient cultivation of greenhouse plants is shown. The developed structure and control algorithm for the supplementary plant lighting process and greenhouse illumination through using LED lamps help reduce energy consumption.

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Comparative transcriptomic analysis of flowering induction in pitaya induced by supplementary lighting

10.21203/rs.2.9246/v1 ◽

2019 ◽

Author(s):

Rui Xiong ◽

Liu Chengli ◽

Min Xu ◽

Shuang-Shuang Wei ◽

Hua Tang

Keyword(s):

Time Course ◽

Molecular Mechanisms ◽

De Novo ◽

Floral Induction ◽

Transcriptomic Analysis ◽

Pcr Analysis ◽

Reverse Transcription Pcr ◽

Transcription Factor Genes ◽

Supplementary Lighting ◽

Transcriptomic Level

Abstract Background Pitayas are currently attracting considerable interest as a fruit with many health benefits. However, the lack of natural light after November in Hainan, China, severely restricts the production of pitaya in winter. To further explore the molecular mechanisms regulating flowering in pitaya, we used de novo RNA sequencing-based transcriptomic analysis for four stages of pitaya subjected to light induction. Results We assembled 68113 unigenes in total, comprising 29782 unigenes with functional annotations in the NR database, 20716 annotations in SwissProt, 18088 annotations in KOG, and 11059 annotations in KEGG. Comparison between different samples revealed different numbers of significantly differentially expressed genes (DEGs). A number of DEGs involved in energy metabolism-related processes and plant hormones were detected. Moreover, we discovered many CONSTANS-LIKE, FLOWERING LOCUS T and other DEGs involved in direct regulation of flowering, along with CDF and TCP, which function as typical transcription factor genes in the flowering process. At the transcriptomic level, we confirmed 13 DEGs with different functions in the time-course response to light-induced flowering by quantitative reverse-transcription PCR analysis. Conclusions These DEGs may include some key genes that control the floral-induction network, increasing our understanding of the molecular mechanism of floral regulation in pitaya. These findings will also aid the development of biotechnologies aimed at creating a variant of pitaya that is less sensitive to light conditions and blooms throughout the year.

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Effect of Supplementary Lighting and Heat Lamps on Greenhouse Environment and Flowering of Cut Roses

Flower Research Journal ◽

10.11623/frj.2018.26.1.03 ◽

2018 ◽

Vol 26 (1) ◽

pp. 19-27 ◽

Cited By ~ 1

Author(s):

Young Shin Chon ◽

◽

Kyeong Jin Jeong ◽

Jeum Kyu Hong ◽

Hyun Suk Shin ◽

...

Keyword(s):

Supplementary Lighting

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Optimization of Spectral Composition and Energy Economy Effectiveness of Phyto-Irradiators With Use of Digital Technologies

Advances in Environmental Engineering and Green Technologies - Handbook of Research on Energy-Saving Technologies for Environmentally-Friendly Agricultural Development ◽

10.4018/978-1-5225-9420-8.ch008 ◽

2020 ◽

pp. 191-212 ◽

Cited By ~ 2

Author(s):

Sergey Stepanovich Mironyuk ◽

Alexander Smirnov ◽

Alexander V. Sokolov ◽

Yuri Proshkin

Keyword(s):

Technology Use ◽

Spectral Composition ◽

Digital Technologies ◽

Vegetable Crops ◽

Light Emitting ◽

Comparative Tests ◽

Energy Economy ◽

Laboratory Investigations ◽

Supplementary Lighting ◽

Definition Of

It is known that in the case of technology use of the supplementary lighting, an irradiation spectral composition heavily influences the effectiveness of the photosynthesis processes, development and productivity of vegetable crops. Hence, the definition of general points at development and projecting of modern phyto-irradiators is one of high-priority tasks in techniques development for plants growing in conditions of protected ground. The research is aimed at reviewing and assessing the effectiveness of existing sources of illumination used in modern systems of supplementary lighting and at deduction of general points of development and projecting of phyto-irradiators based on results of laboratory investigations with the use of modern digital technologies of monitoring and data analysis. The results of the comparative tests of light emitting diodes-based phyto-irradiators showed that the energy consumption per product kilogram is less than in the case of LED-irradiators. Based on the research results, general points were deducted for use at development of modern LED-phyto-irradiators.

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