Development of mercury-free HPS lamp on plant growth for supplemental lighting

Katsusuke Murakami; Naoki Saito; Kimitoshi Horaguchi

doi:10.2150/jieij1980.82.appendix_268

Description of a Crop Growth Model for the Management of Supplemental Lighting in Greenhouses

HortTechnology ◽

10.21273/horttech.4.4.383 ◽

1994 ◽

Vol 4 (4) ◽

pp. 383-389 ◽

Cited By ~ 3

Author(s):

Michel Carrier ◽

André Gosselin ◽

Laurent Gauthier

Keyword(s):

Plant Growth ◽

Growth Model ◽

Management Strategy ◽

Weather Forecast ◽

Dry Weight ◽

Solar Light ◽

Greenhouse Climate ◽

Dynamic Strategy ◽

Supplemental Lighting ◽

Light Integral

A dynamic management strategy for supplemental lighting in greenhouses was developed. It makes use of a plant growth model and of a rule-based decisionmaking protocol within the framework of a generic greenhouse climate management software system. The model, an adapted version of SUCROS87, tracks plant growth and predicts dry weight production based on measured or estimated values of light intensity, temperature, and CO2 concentration. A set of logical predicates (rules) implements the strategy's behavior. Optimization of lamp use was conducted as a function of economic criteria that enable a comparison between the additional income associated with yield increases due to supplemental lighting and incurred cost increases. Although the model is not perfectly reliable in its predictions, the system can be used to simulate the effect of changes to economic parameters on the decisions of the management strategy. The dynamic strategy described here differs from conventional supplemental lighting scenarios in the sense that it increases the length of the period of supplemental lighting when the daily solar light integral is low, and reduces or eliminates the use of supplemental lighting when the weather forecast predicts that the daily solar light integral will exceed plant requirements.

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An Intelligent IoT-enabled Lighting System for Energy-efficient Crop Production

Journal of Daylighting ◽

10.15627/jd.2021.6 ◽

2021 ◽

Vol 8 (1) ◽

pp. 86-99

Author(s):

Jun Jiang ◽

◽

Mehrdad Moallem ◽

Youbin Zhengi ◽

◽

...

Keyword(s):

Plant Growth ◽

Crop Production ◽

Energy Savings ◽

Light Emitting Diode ◽

High Energy ◽

Automation System ◽

Online Data ◽

Natural Lighting ◽

Time Scheduling ◽

Supplemental Lighting

In this paper, an intelligent lighting instrumentation and automation system is presented with the objective of achieving high energy-efficiency in greenhouse supplemental lighting based on the Internet of Things (IoT) technology. The system runs on a Raspbian operating system which interacts with wireless-enabled light emitting diode (LED) fixtures for plant growth, an online data server, and different light sensors including RGB and quantum sensors. The communication is achieved through RestFul API, UART, and I2C. The system is utilized to implement a feedback controller that automatically adjusts the light dimming levels and, in particular, the ratio of red and blue light intensities based on the plants’ needs. A series of experiments involving plant growth were conducted which indicate that the proposed system can achieve energy-savings up to 34%, when compared to a conventional time scheduling scheme. Additionally, the experiments demonstrate that the system can achieve a highly uniform light distribution under unpredictable natural lighting conditions while saving energy due to supplemental lighting.

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Photosynthesis, plant growth, and fruit production of single-truss tomato improves with supplemental lighting provided from underneath or within the inner canopy

Scientia Horticulturae ◽

10.1016/j.scienta.2017.04.026 ◽

2017 ◽

Vol 222 ◽

pp. 221-229 ◽

Cited By ~ 21

Author(s):

Chengyao Jiang ◽

Masahumi Johkan ◽

Masaaki Hohjo ◽

Satoru Tsukagoshi ◽

Mitsuru Ebihara ◽

...

Keyword(s):

Plant Growth ◽

Fruit Production ◽

Supplemental Lighting

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Mechanisms of ethylene biosynthesis and response in plants

Essays in Biochemistry ◽

10.1042/bse0580061 ◽

2015 ◽

Vol 58 ◽

pp. 61-70 ◽

Cited By ~ 11

Author(s):

Paul B. Larsen

Keyword(s):

Plant Growth ◽

Growth And Development ◽

Ethylene Biosynthesis ◽

Unsaturated Hydrocarbon ◽

Flower Senescence ◽

Detailed Knowledge ◽

Plant Growth And Development ◽

Step Process ◽

Ethylene Response ◽

Ethylene Signalling

Ethylene is the simplest unsaturated hydrocarbon, yet it has profound effects on plant growth and development, including many agriculturally important phenomena. Analysis of the mechanisms underlying ethylene biosynthesis and signalling have resulted in the elucidation of multistep mechanisms which at first glance appear simple, but in fact represent several levels of control to tightly regulate the level of production and response. Ethylene biosynthesis represents a two-step process that is regulated at both the transcriptional and post-translational levels, thus enabling plants to control the amount of ethylene produced with regard to promotion of responses such as climacteric flower senescence and fruit ripening. Ethylene production subsequently results in activation of the ethylene response, as ethylene accumulation will trigger the ethylene signalling pathway to activate ethylene-dependent transcription for promotion of the response and for resetting the pathway. A more detailed knowledge of the mechanisms underlying biosynthesis and the ethylene response will ultimately enable new approaches to be developed for control of the initiation and progression of ethylene-dependent developmental processes, many of which are of horticultural significance.

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