Abstract
The experiment was conducted at Universidade Federal de Santa Maria, Rio Grande do Sul State, Brazil, to determine the effect of shading on tomato plants grown in a greenhouse. Sowing was done on July 4th and planting on August 27th, 2000, in a plant density of 3.3 plants m-2, using an organic commercial rooting medium. Water and nutrients were supplied on a daily basis using a nutrient solution. Two polyethylene tunnels (2.20 m height, 5 m width, 15 m length) were used. In the first plastic tunnel, used as control, the transmissivity of global radiation was 83% and plants were conducted as a commercial crop. In the second tunnel, plants were grown under a 52% shading screen. Plant growth and development were measured at 19; 26; 33; 40; 47; 54; 61; 75 and 89 days after beginning of anthesis. Daily average solar radiation in the first tunnel from planting time to the end of the experiment was 12.4 MJ m-2 day-1, whereas in the shaded tunnel it was 5.0 MJ m-2 day-1. Number of fruits per square meter did not differ significantly between the unshaded control and shaded tomato plants. At the last harvest, dry mass from unshaded and shaded plants differed significantly, with values of 974.9 g m-2 and 762.5 g m-2 for total dry mass, 550.1 g m-2 and 419.74 g m-2 for fruits, and 424.75 g m-2 and 342.74 g m-2 for vegetative organs, respectively. Total plant growth was reduced to 21.7% by shading, but plants continued to grow, in spite of the radiation level below the trophic limit of 8.4 MJ m-2 day-1. To establish the climatic suitability of horticultural crops in different regions, it should be advisable to take in account other variables than solar radiation.
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Claims 6
Claim · model-written summary
Shading did not significantly change fruits per square meter.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- shadede0
- Outcome
- Number of fruits per square metere0
- Direction
- did not differe0
- Comparator
- unshaded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of fruits per square meter did not differ significantly between the unshaded control and shaded tomato plants.”
Claim · model-written summary
Shaded tomato had lower total dry mass at final harvest.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- shaded plantse0
- Outcome
- total dry masse0
- Value
- 762.5 g m-2e0
- Qualifier
- 974.9 g m-2e0
- Comparator
- unshadede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the last harvest, dry mass from unshaded and shaded plants differed significantly, with values of 974.9 g m-2 and 762.5 g m-2 for total dry mass”
t0“tomato”
Claim · model-written summary
Shading reduced fruit dry mass at final harvest.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- fruitse0
- Value
- 419.74 g m-2e0
- Qualifier
- 550.1 g m-2e0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“550.1 g m-2 and 419.74 g m-2 for fruits”
t0“tomato”
Claim · model-written summary
Shading reduced vegetative organ dry mass at final harvest.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- vegetative organse0
- Value
- 342.74 g m-2e0
- Qualifier
- 424.75 g m-2e0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“424.75 g m-2 and 342.74 g m-2 for vegetative organs”
t0“tomato”
Claim · model-written summary
Shading reduced total plant growth by 21.7%, but plants kept growing below the stated trophic limit.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- shadinge0
- Outcome
- Total plant growthe0
- Direction
- reducede0
- Value
- 21.7%e0
- Qualifier
- below the trophic limit of 8.4 MJ m-2 day-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total plant growth was reduced to 21.7% by shading, but plants continued to grow, in spite of the radiation level below the trophic limit of 8.4 MJ m-2 day-1.”
t0“tomato”
Claim · model-written summary
Climatic suitability assessments should consider variables beyond solar radiation.
Verbatim
e0“To establish the climatic suitability of horticultural crops in different regions, it should be advisable to take in account other variables than solar radiation.”
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shade · growth · Solanum lycopersicum (tomato)Results differ
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See all 44 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.