Abstract
Cooling greenhouses in the humid tropics is especially challenging due to the high intensity of solar radiation and humidity prevalent in these regions. The effect of natural ventilation and evaporative cooling on the greenhouse microclimate, growth and production of tomato Solanum lycopersicum cv FMTT260 were evaluated. The research was carried out in two greenhouses (measuring 20 m long by 10 m wide) at the experimental site of the “Protected Cultivation Project” on the campus of the “Asian Institute of Technology” (AIT), situated 44 km north of Bangkok in Khlong Luang, Pathum Thani, central Thailand, (14° 04’ N, 100° 37’ E, altitude 2.3 m). The naturally ventilated greenhouse was covered with a UVabsorbing plastic film on the roof and a 50-mesh insect proof net on the sidewalls and roof ventilation opening. The evaporative cooled greenhouse was completely covered with the UV-absorbing plastic film and was equipped with a fan and pad cooling system. In each greenhouse, 300 tomato plants were grown at a density of 1.5 plants m -2 and maintained for 15 to 20 weeks. Results from two seasons show that the cooling method influenced the greenhouse microclimate, plant growth and yield. Although evaporative cooling lowered greenhouse temperature, the unwanted increase in humidity resulted in fungi infections and reduced transpiration. Plants grown in evaporatively cooled greenhouse were 30 cm to 45 cm shorter than those grown in naturally ventilated one. Differences were also noted in flowering, leaf area, dry matter partitioning and harvested yield. The significance of cooling method and greenhouse covering material on plant growth and production in protected cultivation systems in the tropics is discussed.
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Claims 6
Claim · model-written summary
Evaporative cooling lowered greenhouse temperature.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- evaporative coolinge1
- Outcome
- greenhouse temperaturee1
- Direction
- lowerede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e1“Although evaporative cooling lowered greenhouse temperature”
Claim · model-written summary
The humidity increase under evaporative cooling resulted in fungi infections in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- evaporative coolinge1
- Outcome
- fungi infectionse2
- Direction
- resulted ine2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e1“Although evaporative cooling lowered greenhouse temperature”
e2“the unwanted increase in humidity resulted in fungi infections and reduced transpiration”
Claim · model-written summary
Evaporative cooling reduced transpiration in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- evaporative coolinge1
- Outcome
- transpiratione2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e1“Although evaporative cooling lowered greenhouse temperature”
e2“the unwanted increase in humidity resulted in fungi infections and reduced transpiration”
Claim · model-written summary
Tomato plants in the evaporatively cooled greenhouse were 30 cm to 45 cm shorter than in the naturally ventilated one.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- evaporatively cooled greenhousee3
- Outcome
- shortere3
- Direction
- shortere3
- Value
- 30 cm to 45 cme3
- Comparator
- naturally ventilated onee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e3“Plants grown in evaporatively cooled greenhouse were 30 cm to 45 cm shorter than those grown in naturally ventilated one”
Claim · model-written summary
Flowering, leaf area and dry matter partitioning differed between the natural ventilation and evaporative cooling greenhouses.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- natural ventilation and evaporative coolinge5
- Outcome
- flowering, leaf area, dry matter partitioninge4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e4“Differences were also noted in flowering, leaf area, dry matter partitioning and harvested yield”
e5“The effect of natural ventilation and evaporative cooling on the greenhouse microclimate”
Claim · model-written summary
Harvested yield differed between the natural ventilation and evaporative cooling greenhouses.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- natural ventilation and evaporative coolinge5
- Outcome
- harvested yielde4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato Solanum lycopersicum cv FMTT260”
e4“Differences were also noted in flowering, leaf area, dry matter partitioning and harvested yield”
e5“The effect of natural ventilation and evaporative cooling on the greenhouse microclimate”
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