Effect of LED interlighting combined with overhead HPS light on fruit yield and quality of year-round sweet pepper in commercial greenhouse

Guo, Xue-Feng; Hao, Xiying; Khosla, S.; Kumar, Krishan; Cao, Ruge; Bennett, Nicholas J.

doi:10.17660/actahortic.2016.1134.10

Cited by 29 publications

(17 citation statements)

References 19 publications

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“…Guo et al. () found that LED interlighting plus HPS top lighting increased the yield and concentration of health providing compounds of sweat peppers in comparison to HPS only light treatments. However, it should be noted that the total amount of light supplied in the interlighting treatments was greater than that provided by the HPS only treatments.…”

Section: Improving Yields With Interlightingmentioning

confidence: 99%

Photobiology in protected horticulture

Davis

Burns

2016

Food and Energy Security

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The introduction of high power LED lighting systems for horticulture has stimulated substantial interest from both the research community and the protected horticulture industry. LED lighting systems have the potential to reduce electrical energy consumption compared to conventional high pressure sodium lights and their energy efficiency continues to improve. In addition to the potential of LEDs to reduce carbon footprints and reduce running costs, LED lighting also provides considerable opportunities to exploit the wealth of photobiological knowledge to produce horticultural benefits. The narrow emission spectra of LEDs allows lighting systems to be tightly designed to stimulate specific plant photoreceptors, allowing plants to be manipulated to produce desirable characteristics. Lighting systems can be designed to maximize growth, control morphology, and optimize flavor and pigmentation. This review outlines how the light spectrum influences photosynthesis and how plant photoreceptors sense light and control growth. The review then discusses the ways in which this knowledge is being implemented in commercial horticulture to improve factors such as yield, flavor, color, plant growth, and flowering as well as pest and pathogen management and control. Research in this area is moving rapidly as the LED systems improve and increase in efficiency and as the range of novel horticultural applications expands.

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Section: Improving Yields With Interlightingmentioning

confidence: 99%

Photobiology in protected horticulture

Davis

Burns

2016

Food and Energy Security

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“…Recently, intra-canopy lightings with LEDs are widely applied for high-wire fruit vegetable production in greenhouses. It has been reported that yield can be enhanced by 10-20% under intra-canopy lighting condition for sweet bell pepper (Capsicum annuum Davos) and cucumber (Cucumis sativus Picowell) plants (Guo et al 2016;Kumar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Zhang

Yang

et al. 2019

Journal of Integrative Agriculture

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Far-red (FR) light regulates phytochrome-mediated morphological and physiological plant responses. This study aims to investigate how greenhouse tomato morphology and production response to different durations of FR light during daytime and at the end of day (EOD). High-wire tomato plants were grown under intra-canopy lighting consisting of red (peak wavelength at 640 nm) and blue (peak wavelength at 450 nm) light-emitting diodes (LEDs) with photosynthetic photon flux density (PPFD) of 144 μmol m-2 s-1 at 10 cm away from the lamps, and combined with overhead supplemental FR light (peak wavelength at 735 nm) with PPFD of 43 μmol m-2 s-1 at 20 cm below the lamps. Plants were exposed to three durations of FR supplemental lighting including: 06:00-18:00 (FR12), 18:00-19:30 (EOD-FR1.5), 18:00-18:30 (EOD-FR0.5), and control that without supplemental FR light. The results showed that supplemental FR light significantly stimulated stem elongation thereby resulting in longer plants compared with the control. Moreover, FR light altered leaf morphology toward higher leaf length/width ratio and larger leaf area. The altered plant architecture in FR supplemented plants led to a more homogeneous light distribution inside the canopy. Total plant biomass was increased by 9-16% under supplemental FR light in comparison with control, which led to 7-12% increase in ripe fruit yield. Soluble sugar content of the ripe tomato fruit was slightly decreased by longer exposure of the plants to FR light. Dry matter partitioning to different plant organs were not substantially affected by the FR light treatments. No significant differences were observed among the three FR light treatments in plant morphology as well as yield and biomass production. We conclude that under intra-canopy lighting, overhead supplemental FR light stimulates tomato growth and production. And supplementary of EOD-FR0.5 is more favorable, as it consumes less electricity but induces similar effects on plant morphology and yield.

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“…Hence, we investigated energy consumption during a normal crop production period. The analysis of environmental/climate conditions of the selected protected cropping cycle showed that this high-tech facility exhibited excellent environmental control [33,34], which contributed to a higher yield than many larger-scale commercial greenhouses, which are often more than 5 ha in size (50,000 m 2 ). In this study, the analysis of energy consumption over the capsicum production cycle indicates that daily energy consumption varies, due to the seasonal nature of varying temperature and the need for maintaining desirable temperatures.…”

Section: Discussionmentioning

confidence: 99%

Sustainable Protected Cropping: A Case Study of Seasonal Impacts on Greenhouse Energy Consumption during Capsicum Production

et al. 2020

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Sustainable food production in protected cropping is increasing rapidly in response to global climate change and population growth. However, there are significant knowledge gaps regarding energy consumption while achieving optimum environmental conditions for greenhouse crop production. A capsicum crop cultivated in a high-tech greenhouse facility in Australia was analysed in terms of relationships between key environmental variables and the comparative analysis of energy consumption during different seasons. We showed that daily energy consumption varied due to the seasonal nature of the external environment and maintenance of optimal growing temperatures. Total power consumption reported throughout the entire crop cycle for heating (gas hot water system) and cooling (pad and fan) was 12,503 and 5183 kWh, respectively; hence, heating consumed ca. 70% of the total energy requirement over the 8-month growing period (early spring to late autumn) in the greenhouse facility. Regressions of daily energy consumption within each season, designated either predominantly for heating or cooling, indicated that energy consumption was 14.62 kWh per 1 °C heating and 2.23 kWh per 1 °C cooling. Therefore, changing the planting date to late spring is likely to significantly reduce heating energy costs for greenhouse capsicum growers in Australia. The findings will provide useful guidelines to maximise the greenhouse production of capsicum with better economic return by taking into consideration the potential optimal energy saving strategy during different external environment conditions and seasons.

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Effect of LED interlighting combined with overhead HPS light on fruit yield and quality of year-round sweet pepper in commercial greenhouse

Cited by 29 publications

References 19 publications

Photobiology in protected horticulture

Photobiology in protected horticulture

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Sustainable Protected Cropping: A Case Study of Seasonal Impacts on Greenhouse Energy Consumption during Capsicum Production

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