Abstract
In the Netherlands about 2000 ha of glasshouses is equipped with supplementary assimilation light (SL), which is about 19% of the total glasshouse area. Besides increased production, SL results in improved product quality, a better control of yield and quality, possibilities for earlier or year-round production and a more regular labor requirement. In this paper several recent experiments with different strategies of SL (33 up to 210 ¿mol m-2 s-1) for tomato, sweet pepper, cucumber and eggplant are presented and discussed. In general, it was concluded that SL was not economically feasible. For cucumber SL can only be attractive if the crop is grown at high plant density and according to the high-wire system. Based on 3 plantings per year, a production of 147 kg m-2 (360 cucumbers) is possible with 210 ¿mol m-2 s-1 SL during 3000 h/year. Application of 50% of the light within the crop (interlighting) by fluorescent tubes instead of only HPS-lamps above the crop, did not improve production but improved fruit quality in cucumber. Mobile lamps are sometimes used instead of fixed lamps. For sweet pepper and tomato, a fixed-lamp installation was economically more feasible than mobile lamps when compared at the same light intensity. A dynamic simulation model was used to predict effects of different lighting strategies at 500 and 1000 ppm CO2 on potential production. Maximum levels of 110, 64 and 168 kg m-2 year-1 were calculated for tomato, sweet pepper and cucumber, respectively.
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Claims 9
Claim · model-written summary
Supplementary assimilation light was concluded not to be economically feasible across the glasshouse crops studied.
- Taxon
- tomato, sweet pepper, cucumber and eggplant
Cucumis sativus
Capsicum annuum
Solanum lycopersicum
Solanum melongenae1 - Treatment
- SLe0
- Outcome
- economically feasiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, it was concluded that SL was not economically feasible”
e1“for tomato, sweet pepper, cucumber and eggplant are presented”
Claim · model-written summary
For cucumber, supplementary light can only be attractive when the crop is grown at high plant density in the high-wire system.
- Taxon
- cucumberCucumis sativuse2
- Treatment
- SLe2
- Outcome
- attractivee2
- Qualifier
- high plant density and according to the high-wire systeme2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“For cucumber SL can only be attractive if the crop is grown at high plant density and according to the high-wire system”
Claim · model-written summary
With three plantings per year and 210 μmol m-2 s-1 supplementary light for 3000 h/year, cucumber production of 147 kg m-2 is possible.
- Taxon
- cucumberCucumis sativuse3
- Treatment
- 210 ¿mol m-2 s-1 SL during 3000 h/yeare3
- Outcome
- productione3
- Value
- 147 kg m-2e3
- Qualifier
- Based on 3 plantings per yeare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Based on 3 plantings per year, a production of 147 kg m-2 (360 cucumbers) is possible with 210 ¿mol m-2 s-1 SL during 3000 h/year”
Claim · model-written summary
Interlighting with 50% of the light within the crop (fluorescent tubes) did not improve cucumber production compared with HPS lamps above the crop only.
- Taxon
- cucumberCucumis sativuse4
- Treatment
- Application of 50% of the light within the crop (interlighting) by fluorescent tubese4
- Outcome
- productione4
- Direction
- did not improvee4
- Comparator
- only HPS-lamps above the crope4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of 50% of the light within the crop (interlighting) by fluorescent tubes instead of only HPS-lamps above the crop, did not improve production but improved fruit quality in cucumber”
Claim · model-written summary
Interlighting with 50% of the light within the crop (fluorescent tubes) improved cucumber fruit quality compared with HPS lamps above the crop only.
- Taxon
- cucumberCucumis sativuse4
- Treatment
- Application of 50% of the light within the crop (interlighting) by fluorescent tubese4
- Outcome
- fruit qualitye4
- Direction
- improvede4
- Comparator
- only HPS-lamps above the crope4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of 50% of the light within the crop (interlighting) by fluorescent tubes instead of only HPS-lamps above the crop, did not improve production but improved fruit quality in cucumber”
Claim · model-written summary
A fixed-lamp installation was economically more feasible than mobile lamps for sweet pepper and tomato at the same light intensity.
- Taxon
- sweet pepper and tomatoCapsicum annuumSolanum lycopersicume5
- Treatment
- fixed-lamp installatione5
- Outcome
- economicallye5
- Direction
- more feasiblee5
- Qualifier
- at the same light intensitye5
- Comparator
- mobile lampse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“For sweet pepper and tomato, a fixed-lamp installation was economically more feasible than mobile lamps when compared at the same light intensity”
Claim · model-written summary
The simulated maximum production of tomato under different lighting strategies at 500 and 1000 ppm CO2 is 110 kg m-2 year-1.
- Taxon
- tomatoSolanum lycopersicume7
- Treatment
- different lighting strategies at 500 and 1000 ppm CO2e6
- Outcome
- Maximum levelse7
- Value
- 110e7
- Qualifier
- kg m-2 year-1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“A dynamic simulation model was used to predict effects of different lighting strategies at 500 and 1000 ppm CO2 on potential production”
e7“Maximum levels of 110, 64 and 168 kg m-2 year-1 were calculated for tomato, sweet pepper and cucumber, respectively”
Claim · model-written summary
The simulated maximum production of sweet pepper under different lighting strategies at 500 and 1000 ppm CO2 is 64 kg m-2 year-1.
- Taxon
- sweet pepperCapsicum annuume7
- Treatment
- different lighting strategies at 500 and 1000 ppm CO2e6
- Outcome
- Maximum levelse7
- Value
- 64e7
- Qualifier
- kg m-2 year-1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“A dynamic simulation model was used to predict effects of different lighting strategies at 500 and 1000 ppm CO2 on potential production”
e7“Maximum levels of 110, 64 and 168 kg m-2 year-1 were calculated for tomato, sweet pepper and cucumber, respectively”
Claim · model-written summary
The simulated maximum production of cucumber under different lighting strategies at 500 and 1000 ppm CO2 is 168 kg m-2 year-1.
- Taxon
- cucumberCucumis sativuse7
- Treatment
- different lighting strategies at 500 and 1000 ppm CO2e6
- Outcome
- Maximum levelse7
- Value
- 168e7
- Qualifier
- kg m-2 year-1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“A dynamic simulation model was used to predict effects of different lighting strategies at 500 and 1000 ppm CO2 on potential production”
e7“Maximum levels of 110, 64 and 168 kg m-2 year-1 were calculated for tomato, sweet pepper and cucumber, respectively”
The same questions in other papers
light · yield · Cucumis sativus (cucumber)Results differ
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.