Interlighting improves production of year-round cucumber

Hovi, Tiina; Näkkilä, Juha; Tahvonen, Risto

doi:10.1016/j.scienta.2004.04.003

Cited by 82 publications

(68 citation statements)

References 14 publications

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“…The crop would benefit if upper leaves would intercept less incident light and the middle and lower leaves a greater proportion, in order to realize a more uniform light interception over the foliage. Hovi et al (2004) showed that a higher amount of artificial light within a crop achieved by interlighting significantly increased photosynthesis of the lower leaves of cucumber. The same effect can be realized by diffuse light.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Diffuse Light on Crops

Hemming¹,

Dueck²,

Janse³

et al. 2008

Acta Hortic.

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Light is not evenly distributed in Dutch glass greenhouses, but this can be improved with diffuse light. Modern greenhouse coverings are able to transform most of the light entering the greenhouse into diffuse light. Wageningen UR Greenhouse Horticulture has studied the effect of diffuse light on crops for several years. Modelling and experimental studies showed that crops such as fruit vegetables with a high plant canopy as well as ornamentals with a small plant canopy can utilize diffuse light better than direct light. Diffuse light penetrates the middle layers of a high-grown crop and results in a better horizontal light distribution in the greenhouse. Diffuse light is absorbed to a better degree by the middle leaf layers of cucumber, resulting in a higher photosynthesis. The actual photosynthesis of four pot plant species was found to be increased and crop temperatures were lower during high irradiation. The yield of cucumbers was increased, and the growth rate of several potted plants was increased. These investigations have resulted in a quantitative foundation for the potentials of diffuse light in Dutch horticultural greenhouses and the selection and verification of technological methods to convert direct sunlight into diffuse light.

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Section: Introductionmentioning

confidence: 99%

The Effect of Diffuse Light on Crops

Hemming¹,

Dueck²,

Janse³

et al. 2008

Acta Hortic.

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“…Since the energy consumption of traditional lighting systems such as HPS is high, new ways of using artificial light within a growing system are developed, such as interlighting (Gunnlaugsson and Adalsteinsson, 2006;Hovi et al, 2004). Mobile lighting had been another attempt to use lighting in a more energy efficient way.…”

Section: Interlightingmentioning

confidence: 99%

“…Part of the light is given to the middle/lower parts of the canopy, those parts are then able to contribute more to light absorption and photosynthesis and therefore to total crop yield (Hovi et al, 2004). The effect can probably be compared with the principles described in the chapter about diffuse light above.…”

Section: Interlightingmentioning

confidence: 99%

Use of Natural and Artificial Light in Horticulture - Interaction of Plant and Technology

Hemming¹

2011

Acta Hortic.

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In intensive horticultural cultivation natural light levels often limit crop production during several periods. For an optimum plant production and product quality light intensity, spectrum and photoperiod have to be adapted to the needs of the crops at every moment. Light has to be optimised together with all other growth factors like temperature, humidity and CO 2 . For a sustainable greenhouse production the use of freely available sunlight has to be preferred. New transparent greenhouse covering materials, like ETFE, glass with new anti-reflection coatings or materials with micro-surface structures, transmit a very high amount of light into the greenhouse. Other new materials are able to scatter the incoming light and make it diffuse. Diffuse light penetrates deeper into the canopy, increases light interception by the crop, influences micro-climate and increases crop production by 6.5-9.2% in The Netherlands, the potential in lower latitudes is even higher. Other materials manipulate light spectrum. Photoselective nettings have been developed in different colours influencing morphogenesis and crop production. Fluorescent plastic films combine effects on morphogenesis with high light transmission, especially important for higher latitudes. When sunlight is optimized it can still be necessary to add artificial light to ensure a year-round supply of horticultural products. There is still room for improving the crop energy efficiency under artificial lighting by changing duration and intensity of lighting, different growing systems and plant densities. Since artificial lighting requires a high amount of energy, new artificial lighting systems have been developed, such as interlighting and light emitting diodes (LED). LED give the possibility for true light spectrum control in the future. The (partial) replacement of HPS lamps by LED systems is currently under investigation in Dutch greenhouses. Integration in current growing systems has full attention. In order to reach a high sustainable and economic beneficial production the factor light has to be integrated and optimized within the total horticultural system.

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“…Recently in Northern Europe and Canada, supplemental lighting techniques have been developed for many plants, illuminating them plants from the top or the side by using high-pressure sodium lamps, fluorescent lamps, and light emitting diodes (LEDs) for in tomato (Gosselin et al, 1996;Gunnlaugsson and Adalsteinsson, 2006;Heuvelink et al, 2006), cucumber (Hovi et al, 2004;Hovi-Pekkanen and Tahvonen, 2008;Pettersen et al, 2010;Trouwborst et al, 2010), and sweet pepper production (Hovi-Pekkanen et al, 2006). These countries have insufficient DLI from natural light between the autumn and spring to grow such crops.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have shown the positive effects of supplemental lighting on fruit growth and yield (Gosselin et al, 1996;Hovi et al, 2004;Gunnlaugsson and Adalsteinsson, 2006;Hovi-Pekkanen and Tahvonen, 2008;Pettersen et al, 2010). Some of these studies showed the seasonal effect of supplemental lighting, i.e., that increases yields of tomato (Heuvelink et al, 2006) and sweet pepper (Hovi-Pekkanen et al, 2006) throughout the year, except from June to August.…”

Section: Introductionmentioning

confidence: 99%

Effects of light intensity and amount of supplemental LED lighting on photosynthesis and fruit growth of tomato plants under artificial conditions

Hikosaka

Iyoki

Hayakumo

et al. 2013

J. Agric. Meteorol.

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We assessed the effects of light intensity (photosynthetic photon flux [PPF in µmol·m -2 ·s -1 ]) and number of irradiated leaves on photosynthesis and the fruit growth of individual tomato plants to develop supplemental LED lighting techniques for greenhouse tomato production. In Experiment (Exp.) 1, three PPF levels (P200, P500, and P1000) were applied to a post-anthesis tomato plant for three weeks, each plant pruned to have one leaf and one truss with three flowers. The fruit set and leaf and fruit dry-weight increased with increasing PPF; however, after P500 and P1000 treatments, the leaves showed signs of stress and accompanying disorders. Thus, to increase the fruit set ratio and growth rate of tomato fruits and plants, the total amount of irradiation received by each plant should be increased by increasing the number of irradiated leaves, rather than raising the PPF per leaf. For prolonged cultivation, P200 was the optimal PPF per leaf under the tested treatments. Exp. 2 used standard tomato plants with no leaves or trusses removed. We used an assimilation chamber to examine the effect of the number of leaves receiving P200 irradiation on the photosynthetic rate (Pn) per plant (above ground part). The Pn per plant in treatments where one and two leaves were irradiated by supplemental LED lighting were, respectively, 12 and 28％ higher than that in the control (only top lighting). Therefore, fruit growth and yields in tomato cultivation may be raised via acceleration of photosynthesis by increasing the number of leaves that receive P200 irradiation rather than by increasing PPF.

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Interlighting improves production of year-round cucumber

Cited by 82 publications

References 14 publications

The Effect of Diffuse Light on Crops

The Effect of Diffuse Light on Crops

Use of Natural and Artificial Light in Horticulture - Interaction of Plant and Technology

Effects of light intensity and amount of supplemental LED lighting on photosynthesis and fruit growth of tomato plants under artificial conditions

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