Abstract
Abstract In order to reduce heat energy consumption in greenhouse cucumber production, (transparent) screens may be used also during the day, particularly in the early growth phase when high temperatures are required to achieve rapid leaf area development. However, energy savings must be optimised against light reduction‐induced yield loss. For this reason, two experiments were conducted to quantify the effect on photosynthesis and growth of screening cucumber plants during their early growth phase, and on yield in the following generative phase. Screening with different light transmission coefficients was simulated using shading nets. Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR ). Moreover, potential leaf net photosynthesis decreased by 0.46% per 1% PAR reduction. A major impact was that the leaf dry matter content, leaf starch content and leaf sugar content of shaded plants diminished significantly. In the course of the following 2 weeks under full light, the leaf photosynthesis of the plants previously shaded recovered fully and the leaf area index rose to 3.3 m 2 m −2 , considered sufficient for optimal crop photosynthesis. The yield from plants previously shaded diminished slightly as early as from the first harvest week on. These yield losses increased further over the next few weeks, measuring approximately 0.8 kg m −2 per 1 mol m −2 day −1 PAR reduction in the early growth phase. The effect of PAR on plant growth was proportional when relating the PAR integral over the entire experimental period to the total yield and to the total dry matter production, respectively.
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Claims 8
Claim · model-written summary
Shading during the first 5 weeks reduced cucumber leaf area by 0.40% per 1% reduction in PAR under Central European winter conditions.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- Shading the plants during the first 5 weeks under Central European winter conditionse0
- Outcome
- leaf areae0
- Direction
- reducede0
- Value
- 0.40% per 1% reduction in photosynthetic active radiatione0
- Setting
- Central European winter conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e0“Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR )”
Claim · model-written summary
Shading reduced potential leaf net photosynthesis of cucumber by 0.46% per 1% PAR reduction.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Shading the plants during the first 5 weekse0
- Outcome
- potential leaf net photosynthesise1
- Direction
- decreasede1
- Value
- 0.46%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e0“Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR )”
e1“potential leaf net photosynthesis decreased by 0.46% per 1% PAR reduction”
Claim · model-written summary
Shading significantly diminished leaf dry matter, leaf starch and leaf sugar contents of cucumber.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Shading the plants during the first 5 weekse0
- Outcome
- leaf dry matter content, leaf starch content and leaf sugar contente2
- Direction
- diminishede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e0“Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR )”
e2“A major impact was that the leaf dry matter content, leaf starch content and leaf sugar content of shaded plants diminished significantly”
Claim · model-written summary
Previously shaded cucumber plants fully recovered leaf photosynthesis under full light.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Shading the plants during the first 5 weekse0
- Outcome
- leaf photosynthesise3
- Direction
- recovered fullye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e0“Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR )”
e3“the leaf photosynthesis of the plants previously shaded recovered fully”
Claim · model-written summary
Leaf area index of previously shaded cucumber plants rose to 3.3 m2 m-2 under full light.
- Taxon
- cucumberCucumis sativust0
- Outcome
- leaf area indexe4
- Value
- 3.3 m 2 m −2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e4“the leaf area index rose to 3.3 m 2 m −2”
Claim · model-written summary
Yield from previously shaded cucumber plants diminished slightly from the first harvest week on.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Shading the plants during the first 5 weekse0
- Outcome
- yielde5
- Direction
- diminishede5
- Qualifier
- slightlye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e0“Shading the plants during the first 5 weeks under Central European winter conditions reduced the leaf area by 0.40% per 1% reduction in photosynthetic active radiation ( PAR )”
e5“The yield from plants previously shaded diminished slightly as early as from the first harvest week on”
Claim · model-written summary
Yield losses in cucumber increased by about 0.8 kg m -2 per 1 mol m -2 day -1 PAR reduction in the early growth phase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PAR reductione6
- Outcome
- yield lossese6
- Direction
- increasede6
- Value
- 0.8 kg m −2 per 1 mol m −2 day −1 PAR reductione6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e6“These yield losses increased further over the next few weeks, measuring approximately 0.8 kg m −2 per 1 mol m −2 day −1 PAR reduction in the early growth phase”
Claim · model-written summary
Cucumber total yield and total dry matter production were proportional to the PAR integral over the experiment.
- Taxon
- cucumberCucumis sativust0
- Treatment
- PAR integrale7
- Outcome
- total yielde7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Screening a cucumber crop during leaf area development reduces yield”
e7“The effect of PAR on plant growth was proportional when relating the PAR integral over the entire experimental period to the total yield and to the total dry matter production, respectively”
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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.