Abstract
Photovoltaic greenhouses have been claimed to be a solution to cover the energy demand of the protected crops sector. Thus, there is a need to know what is the maximum percentage of shading produced by roof-top photovoltaic panels that does not affect crop yields. The present study analyzes the effects of increasing percentages of shading in a greenhouse tomato crop located in the southeast of Spain. For this study, photovoltaic panels have been simulated with opaque sheets located in the roof-top of a north–south oriented greenhouse. Three treatments of top roof shading percentage (15%, 30% and 50%) where studied and compared with the control treatment without shading (0%). During the study, parameters registered were radiation, temperature, pH and electric conductivity of the substrate, crop yields and fruit quality. Results of the analysis show that higher percentages of shading in the roof-top of greenhouses reduce so much available radiation for the crop causing a reduction in the yield and fruit quality, even in Mediterranean areas where radiation is not a limiting factor.
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Claims 3
Claim · model-written summary
Roof-top shading of 15%, 30% and 50% reduced tomato yield compared with the unshaded control.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- top roof shading percentage (15%, 30% and 50%)e2
- Outcome
- yielde3
- Direction
- reductione3
- Comparator
- control treatment without shading (0%)e2
- Setting
- southeast of Spaine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a greenhouse tomato crop located in the southeast of Spain”
e2“Three treatments of top roof shading percentage (15%, 30% and 50%) where studied and compared with the control treatment without shading (0%)”
e3“higher percentages of shading in the roof-top of greenhouses reduce so much available radiation for the crop causing a reduction in the yield and fruit quality”
Claim · model-written summary
Roof-top shading of 15%, 30% and 50% reduced tomato fruit quality compared with the unshaded control.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- top roof shading percentage (15%, 30% and 50%)e2
- Outcome
- fruit qualitye3
- Direction
- reductione3
- Comparator
- control treatment without shading (0%)e2
- Setting
- southeast of Spaine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a greenhouse tomato crop located in the southeast of Spain”
e2“Three treatments of top roof shading percentage (15%, 30% and 50%) where studied and compared with the control treatment without shading (0%)”
e3“higher percentages of shading in the roof-top of greenhouses reduce so much available radiation for the crop causing a reduction in the yield and fruit quality”
Claim · model-written summary
Higher shading percentages reduced the radiation available to the tomato crop compared with the unshaded control.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- higher percentages of shadinge3
- Outcome
- available radiatione3
- Direction
- reducee3
- Comparator
- control treatment without shading (0%)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a greenhouse tomato crop located in the southeast of Spain”
e2“Three treatments of top roof shading percentage (15%, 30% and 50%) where studied and compared with the control treatment without shading (0%)”
e3“higher percentages of shading in the roof-top of greenhouses reduce so much available radiation for the crop causing a reduction in the yield and fruit quality”
The same questions in other papers
shade · yield · Solanum lycopersicum (tomato)Results differ
17 papers in the same direction as this paper · 26 in the opposite direction
- negative
- positive
- positive
40 papers more in this group
See all 44 papers →shade · quality: grain · Solanum lycopersicum (tomato)Results agree
4 papers in the same direction as this paper
- negative
- no effect
- negative
1 paper more in this group
See all 5 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.