Abstract
Tomato plants (Lycopersicon esculentum 'Vedettos') were submitted to 10 light treatments obtained by modifying the supplemental photosynthetic photon flux (FPP) (0, 100, 150 μmol m −2 s −1 ), the photoperiod (natural, 14 h, 17 h, 20 h, 24 h) and the light distribution mode (one or two dark periods). Supplemental light was supplied by high-pressure vapor sodium lamps (HPS). Our results showed that supplemental lighting at a level of 150 μmol m −2 s −1 (PAR) helped to maintain a weekly yield of over 1 kg m −2 during November, December and January. Prolongation of the photoperiod over 14 h did not increase the yield. Plants exposed to continuous lighting were damaged even if they had been previously exposed to long photoperiods (17 and 20 h). For photoperiods of 17 and 20 h, lighting during the night which generated two dark periods per day damaged the plants and reduced the yields. Key words: Tomato (Lycopersicon esculentum), greenhouse, supplemental lighting, continuous lighting, yield, physiological disorders
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Claims 5
Claim · model-written summary
Supplemental lighting of 150 μmol m −2 s −1 (PAR) helped maintain a weekly tomato yield of over 1 kg m −2 during November, December and January.
- Taxon
- Lycopersicon esculentum
Solanum lycopersicume0 - Material
- Vedettose0
- Treatment
- supplemental lighting at a level of 150 μmol m −2 s −1 (PAR)e1
- Outcome
- weekly yielde1
- Direction
- maintaine1
- Value
- over 1 kg m −2e1
- Setting
- November, December and Januarye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants (Lycopersicon esculentum 'Vedettos')”
e1“supplemental lighting at a level of 150 μmol m −2 s −1 (PAR) helped to maintain a weekly yield of over 1 kg m −2 during November, December and January”
Claim · model-written summary
Prolonging the photoperiod over 14 h did not increase tomato yield.
- Taxon
- Lycopersicon esculentumSolanum lycopersicume0
- Material
- Vedettose0
- Treatment
- Prolongation of the photoperiod over 14 he2
- Outcome
- yielde2
- Direction
- did not increasee2
- Comparator
- 14 he2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants (Lycopersicon esculentum 'Vedettos')”
e2“Prolongation of the photoperiod over 14 h did not increase the yield”
Claim · model-written summary
Continuous lighting damaged tomato plants even after earlier exposure to long photoperiods of 17 and 20 h.
- Taxon
- Lycopersicon esculentumSolanum lycopersicume0
- Treatment
- continuous lightinge3
- Outcome
- damagede3
- Qualifier
- even if they had been previously exposed to long photoperiods (17 and 20 h)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants (Lycopersicon esculentum 'Vedettos')”
e3“Plants exposed to continuous lighting were damaged even if they had been previously exposed to long photoperiods (17 and 20 h)”
Claim · model-written summary
Night lighting that generated two dark periods per day damaged tomato plants at photoperiods of 17 and 20 h.
- Taxon
- Lycopersicon esculentumSolanum lycopersicume0
- Treatment
- lighting during the night which generated two dark periods per daye4
- Outcome
- damaged the plantse4
- Qualifier
- photoperiods of 17 and 20 he4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants (Lycopersicon esculentum 'Vedettos')”
e4“For photoperiods of 17 and 20 h, lighting during the night which generated two dark periods per day damaged the plants and reduced the yields”
Claim · model-written summary
Night lighting that generated two dark periods per day reduced tomato yields at photoperiods of 17 and 20 h.
- Taxon
- Lycopersicon esculentumSolanum lycopersicume0
- Treatment
- lighting during the night which generated two dark periods per daye4
- Outcome
- yieldse4
- Direction
- reducede4
- Qualifier
- photoperiods of 17 and 20 he4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants (Lycopersicon esculentum 'Vedettos')”
e4“For photoperiods of 17 and 20 h, lighting during the night which generated two dark periods per day damaged the plants and reduced the yields”
The same questions in other papers
light · yield · Solanum lycopersicum (tomato)Positive and negative results
84 papers in the same direction as this paper · 18 in the opposite direction · 2 reporting no difference from an alternative
- positive
- negative
- negative
101 papers more in this group
See all 105 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.