A supplementary lighting and regulatory scheme using a multi-wavelength light emitting diode module for greenhouse application

Chang, Chung‐Liang; Hong, G-F; Li, Yingli

doi:10.1177/1477153513495403

Cited by 16 publications

(7 citation statements)

References 42 publications

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“…Recently, light-emitting diodes (LEDs) have been increasingly used as an alternative to HPS due to their comparatively high energy efficiency and durability (Mitchell et al, 2015;Morrow, 2008;Nelson and Bugbee, 2014;Pattison et al, 2016). In addition, the potential for spectrum and intensity control with LEDs give growers more power to manipulate their crops with light and save energy when natural lighting is sufficient (Chang et al, 2014;Zheng, 2018a, 2018b;Morrow, 2008). Considerable research has been devoted to investigating different SL spectrum treatments in greenhouse environments (Bantis et al, 2018) where comparable supplemental light intensities (LIs) have yielded similar crop productivity metrics for LED vs. HPS in many commodities (Currey and Lopez, 2013;Hern andez and Kubota, 2015;Llewellyn et al, 2019;Martineau et al, 2012;Poel and Runkle, 2017;Randall and Lopez, 2014).…”

mentioning

confidence: 99%

Different Microgreen Genotypes Have Unique Growth and Yield Responses to Intensity of Supplemental PAR from Light-emitting Diodes during Winter Greenhouse Production in Southern Ontario, Canada

Jones-Baumgardt¹,

Llewellyn²,

Zheng³

2020

horts

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Low natural daily light integrals (DLIs) are a major limiting factor for greenhouse production during darker months (e.g., October to February in Canada). Supplemental lighting (SL) is commonly used to maintain crop productivity and quality during these periods, particularly when the supply chain demands consistent production levels year-round. What remains to be determined are the optimum SL light intensities (LIs) for winter production of a myriad of different commodities. The present study investigated the growth and yield of sunflower (Helianthus annuus L., ‘Black oil’), kale (Brassica napus L., ‘Red Russian’), arugula (Eruca sativa L.), and mustard (Brassica juncea L., ‘Ruby Streaks’), grown as microgreens, in a greenhouse under SL light-emitting diode (LED) photosynthetic photon flux density (PPFD) levels ranging from 17.0 to 304 μmol·m−2·s−1 with a 16-hour photoperiod (i.e., supplemental DLIs from 1.0 to 17.5 mol·m−2·d−1). Crops were sown in a commercial greenhouse near Hamilton, ON, Canada (lat. 43°14′N, long. 80°07′W) on 1 Feb. 2018, and harvested after 8, 11, 12, and 12 days, resulting in average natural DLIs of 6.5, 5.9, 6.2, and 6.2 mol·m−2·d−1 for sunflower, kale, arugula, and mustard, respectively. Corresponding total light integrals (TLIs) ranged from 60 to 188 mol·m−2 for sunflower, 76 to 258 mol·m−2 for kale, 86 to 280 mol·m−2 for arugula, and 86 to 284 mol·m−2 for mustard. Fresh weight (i.e., marketable yield) increased asymptotically with increasing LI and leaf area increased linearly with increasing LI, in all genotypes. Hypocotyl length of mustard decreased and hypocotyl diameter of sunflower, arugula, and mustard increased with increasing LI. Dry weight, robust index, and relative chlorophyll content increased and specific leaf area decreased in kale, arugula, and mustard with increasing LI. Commercial microgreen greenhouse growers can use the light response models described herein to predict relevant production metrics according to the available (natural and supplemental) light levels to select the most appropriate SL LI to achieve the desired production goals as economically as possible.

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mentioning

confidence: 99%

Different Microgreen Genotypes Have Unique Growth and Yield Responses to Intensity of Supplemental PAR from Light-emitting Diodes during Winter Greenhouse Production in Southern Ontario, Canada

Jones-Baumgardt¹,

Llewellyn²,

Zheng³

2020

horts

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“…The data transformation processing function calculates the leaf area index (LAI) and the cumulative amount of light of the

cultivation zone, and the calculated values are sent to the stage selector. The leaf area and number of leaves in various culture areas are obtained using a charge-coupled-device (CCD) to record the plant leaf width above the various cultivation zones, and then the leaf area index is calculated by the image processing method [ 14 ]. In general, the maximum LAI for vegetables is around 5, and it is ideal when the LAI remains between 3 and 4 [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

“…Embedded wireless sensor modules are accepted by many users for their low energy consumption, compactness, and low cost [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Besides, control facilities and monitoring devices are developing towards microminiaturization, intelligence, and unified specifications [ 12 , 13 , 14 , 15 ]. However, as the climatic factors of greenhouses have strong relationships with each other, it is difficult to build an environmental climate model.…”

Section: Introductionmentioning

confidence: 99%

Using a Novel Wireless-Networked Decentralized Control Scheme under Unpredictable Environmental Conditions

Chang

Huang

Hong

2015

Sensors

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The direction of sunshine or the installation sites of environmental control facilities in the greenhouse result in different temperature and humidity levels in the various zones of the greenhouse, and thus, the production quality of crop is inconsistent. This study proposed a wireless-networked decentralized fuzzy control scheme to regulate the environmental parameters of various culture zones within a greenhouse. The proposed scheme can create different environmental conditions for cultivating different crops in various zones and achieve diversification or standardization of crop production. A star-type wireless sensor network is utilized to communicate with each sensing node, actuator node, and control node in various zones within the greenhouse. The fuzzy rule-based inference system is used to regulate the environmental parameters for temperature and humidity based on real-time data of plant growth response provided by a growth stage selector. The growth stage selector defines the control ranges of temperature and humidity of the various culture zones according to the leaf area of the plant, the number of leaves, and the cumulative amount of light. The experimental results show that the proposed scheme is stable and robust and provides basis for future greenhouse applications.

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“…The energy source for photosynthesis is light, which is essential not only for that process, but also for plant growth and development (Chen at al. 2004, Chang at al. 2014.…”

Section: Referencesmentioning

confidence: 99%

10th International Conference, Plant Functioning Under Environmental Stress, September 16-19, 2015, Cracow, Poland

Grzesiak¹

2015

Acta Physiol Plant

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A supplementary lighting and regulatory scheme using a multi-wavelength light emitting diode module for greenhouse application

Cited by 16 publications

References 42 publications

Different Microgreen Genotypes Have Unique Growth and Yield Responses to Intensity of Supplemental PAR from Light-emitting Diodes during Winter Greenhouse Production in Southern Ontario, Canada

Different Microgreen Genotypes Have Unique Growth and Yield Responses to Intensity of Supplemental PAR from Light-emitting Diodes during Winter Greenhouse Production in Southern Ontario, Canada

Using a Novel Wireless-Networked Decentralized Control Scheme under Unpredictable Environmental Conditions

10th International Conference, Plant Functioning Under Environmental Stress, September 16-19, 2015, Cracow, Poland

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