Abstract
Supplemental lighting can significantly increase production of greenhouse vegetable crops during seasons of low natural light, but the cost of electricity to support supplemental lighting often poses a substantial burden on greenhouse growers. Electrical costs can be mitigated, while maintaining the same daily light integral (DLI), by decreasing the light intensity and extending the supplemental photoperiod. We provided greenhouse eggplant ( Solanum melongena ) cv. Jaylo with three distinctive supplemental light photoperiods: 16-hour of white light, 20-hour of white light, and 16-hour of white light followed by 8h of blue light [24-hour continuous lighting (CL)]. Each photoperiod treatment had a supplemental DLI of 8.64 mol day -1 and was compared to an unlit control group which only had natural light. No significant difference in fruit yield was found between any of the lit treatments, but supplemental lighting treatments increased total yield by 124-144% relative to the unlit control. A 20-hour photoperiod contributed to elevated levels of leaf stress early in the trial, recorded through dark-adapted and light-adapted chlorophyll fluorescence metrics, while plants treated with 16-hour of supplemental light achieved the greatest vegetative biomass. However, leaf stress was not recorded in the 20-hour treatment plants as the trial progressed, as the natural light DLI rose. Our data illustrated that a CL strategy resulted in similar yields and comparable plant growth as other supplemental photoperiods; therefore, we implore greenhouse eggplant growers to utilize a dynamic 24-hour photoperiod to possibly reduce the electrical cost of supplemental lighting during the winter.
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Claims 7
Claim · model-written summary
Fruit yield did not differ significantly among supplemental light treatments.
- Taxon
- eggplant
Solanum melongenat0 - Treatment
- lit treatmentse0
- Outcome
- fruit yielde0
- Direction
- No significant differencee0
- Comparator
- lit treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant difference in fruit yield was found between any of the lit treatments”
t0“eggplant”
Claim · model-written summary
Supplemental lighting increased total yield by 124-144% relative to an unlit control.
- Taxon
- eggplantSolanum melongenat0
- Treatment
- supplemental lighting treatmentse0
- Outcome
- total yielde0
- Direction
- increasede0
- Value
- 124-144%e0
- Comparator
- unlit controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental lighting treatments increased total yield by 124-144% relative to the unlit control.”
t0“eggplant”
Claim · model-written summary
A 20-hour photoperiod elevated early leaf stress.
- Taxon
- eggplantSolanum melongenat0
- Treatment
- 20-hour photoperiode0
- Outcome
- leaf stresse0
- Direction
- elevatede0
- Qualifier
- early in the triale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 20-hour photoperiod contributed to elevated levels of leaf stress early in the trial, recorded through dark-adapted and light-adapted chlorophyll fluorescence metrics”
t0“eggplant”
Claim · model-written summary
Plants with 16 hours of supplemental light had the greatest vegetative biomass.
- Taxon
- eggplantSolanum melongenat0
- Treatment
- 16-hour of supplemental lighte0
- Outcome
- vegetative biomasse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants treated with 16-hour of supplemental light achieved the greatest vegetative biomass.”
t0“eggplant”
Claim · model-written summary
Leaf stress was no longer recorded later in the 20-hour treatment as natural light rose.
- Taxon
- eggplantSolanum melongenat0
- Treatment
- 20-hour treatmente0
- Outcome
- leaf stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf stress was not recorded in the 20-hour treatment plants as the trial progressed, as the natural light DLI rose.”
t0“eggplant”
Claim · model-written summary
Continuous lighting gave similar yields and plant growth to other supplemental photoperiods.
- Taxon
- eggplantSolanum melongenat0
- Treatment
- CL strategye0
- Outcome
- yields and comparable plant growthe0
- Direction
- similare0
- Comparator
- other supplemental photoperiodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a CL strategy resulted in similar yields and comparable plant growth as other supplemental photoperiods”
t0“eggplant”
Claim · model-written summary
The authors recommend a dynamic 24-hour photoperiod to possibly reduce winter lighting electricity costs.
- Taxon
- eggplantSolanum melongenae0
- Outcome
- utilize a dynamic 24-hour photoperiode0
- Qualifier
- possibly reduce the electrical cost of supplemental lighting during the wintere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we implore greenhouse eggplant growers to utilize a dynamic 24-hour photoperiod to possibly reduce the electrical cost of supplemental lighting during the winter.”
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See all 7 papers →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.