Abstract
Most vegetable crop production in Mississippi (MS) occurs during the summer, characterized by high temperature and relative humidity. Lettuce yield and harvest quality are significantly affected by heat stress. To avoid the heat stress of the summer months, lettuce production in MS is either produced in controlled environments or during the winter months with cooler temperatures. This period, however, coincides with months with low solar radiation and shorter day length, resulting in a longer growing season and poor harvest quality. Therefore, this study was conducted to determine the optimum duration of light supplement on the growth, yield, and water use of greenhouse (GH) lettuce during the winter season in north Mississippi. In this study, three daily supplemental light duration regimes, 0 h, 4 h, and 8 h, starting at sunset, were evaluated across two lettuce cultivars, Green Forest (GF) and Ruby (RB). The study indicated that supplemental lighting significantly increased lettuce growth, yield, and water use. Although day length extension from 4 to 8 h of supplemental light had no yield benefits on the RB cultivar, extending day length from 4 to 8 h increased GF yield by 42%. It was also observed that the effects of light supplementation during low natural light quality at early or later growth stages differ between cultivars. Based on the results obtained from this study, a 4 h and 8 h post-sunset light supplementation is considered optimum for RB and GF lettuce cultivars, respectively, during the winter growing season in MS.
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Claims 8
Claim · model-written summary
Supplemental lighting significantly increased lettuce growth.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- supplemental lightinge0
- Outcome
- lettuce growthe0
- Direction
- increasede0
- Comparator
- 0 he1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental lighting significantly increased lettuce growth, yield, and water use”
e1“0 h, 4 h, and 8 h”
Claim · model-written summary
Supplemental lighting significantly increased lettuce yield.
- Taxon
- lettuceLactuca sativae0
- Treatment
- supplemental lightinge0
- Outcome
- yielde0
- Direction
- increasede0
- Comparator
- 0 he1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental lighting significantly increased lettuce growth, yield, and water use”
e1“0 h, 4 h, and 8 h”
Claim · model-written summary
Supplemental lighting significantly increased lettuce water use.
- Taxon
- lettuceLactuca sativae0
- Treatment
- supplemental lightinge0
- Outcome
- water usee0
- Direction
- increasede0
- Comparator
- 0 he1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental lighting significantly increased lettuce growth, yield, and water use”
e1“0 h, 4 h, and 8 h”
Claim · model-written summary
Extending supplemental light from 4 to 8 h gave no yield benefit for Ruby lettuce.
- Taxon
- LettuceLactuca sativat0
- Material
- Ruby (RB)e1
- Treatment
- 8 h of supplemental lighte0
- Outcome
- yield benefitse0
- Direction
- noe0
- Comparator
- 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“day length extension from 4 to 8 h of supplemental light had no yield benefits on the RB cultivar”
e1“Ruby (RB)”
t0“Lettuce”
Claim · model-written summary
Extending supplemental light from 4 to 8 h increased Green Forest lettuce yield by 42%.
- Taxon
- LettuceLactuca sativat0
- Material
- Green Forest (GF)e1
- Treatment
- 8 he0
- Outcome
- GF yielde0
- Direction
- increasede0
- Value
- 42%e0
- Comparator
- 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extending day length from 4 to 8 h increased GF yield by 42%”
e1“Green Forest (GF)”
t0“Lettuce”
Claim · model-written summary
Effects of supplemental lighting at early versus later growth stages differed between cultivars.
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- early or later growth stagese0
- Outcome
- effects of light supplementatione0
- Direction
- differe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of light supplementation during low natural light quality at early or later growth stages differ between cultivars”
t0“Lettuce”
Claim · model-written summary
The authors considered 4 h post-sunset supplemental light optimal for Ruby lettuce in winter in Mississippi.
- Taxon
- lettuceLactuca sativae0
- Material
- Ruby (RB)e1
- Outcome
- 4 he0
- Setting
- MSe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 4 h and 8 h post-sunset light supplementation is considered optimum for RB and GF lettuce cultivars, respectively, during the winter growing season in MS”
e1“Ruby (RB)”
Claim · model-written summary
The authors considered 8 h post-sunset supplemental light optimal for Green Forest lettuce in winter in Mississippi.
- Taxon
- lettuceLactuca sativae0
- Material
- Green Forest (GF)e1
- Outcome
- 8 h post-sunset light supplementatione0
- Setting
- MSe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 4 h and 8 h post-sunset light supplementation is considered optimum for RB and GF lettuce cultivars, respectively, during the winter growing season in MS”
e1“Green Forest (GF)”
The same questions in other papers
light · yield · Lactuca sativa (garden lettuce)Positive and negative results
52 papers in the same direction as this paper · 15 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- no effect
- no effect
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See all 71 papers →light · growth · Lactuca sativa (garden lettuce)Positive and negative results
242 papers in the same direction as this paper · 54 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
- positive
296 papers more in this group
See all 300 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.