Abstract
Vegetable cultivation in closed tunnels in the Tropics is impeded by high temperatures and poor pollination. This study compared the performance of cucurbits cultivated in open plots, in closed tunnels totally covered with small or large mesh nets (nethouse), and in open tunnels with a plastic film roof (rain shelter) in Tanzania over two seasons. Information was collected on climatic conditions, insect pest populations, vegetative development and yield. Temperatures were significantly higher under the tunnels than in the open plots during the day with few differences between the different tunnels. Insect pest populations were lower under nethouses than in open plots and under rain shelters, especially fruit flies. Higher marketable yields were obtained under nethouses with a small mesh (70.9 and 96.9 t.ha−1) and a large mesh (67.4 and 53.1 t.ha−1) than in open tunnels (12.9 and 9.1 t.ha−1) and in open plots (3.8 and 7.2 t.ha−1). Our results demonstrate that nets, especially with a small mesh size, provide versatile and efficient protection against major insect pests of cucumber, as well as a conducive environment for the development of the crop under local climatic conditions.
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Claims 7
Claim · model-written summary
Daytime temperatures were significantly higher in tunnels than open plots.
- Taxon
- cucumber
Cucumis sativust0 - Outcome
- Temperaturese0
- Direction
- highere0
- Comparator
- open plotse0
- Setting
- tunnelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Temperatures were significantly higher under the tunnels than in the open plots during the day”
t0“cucumber”
Claim · model-written summary
Daytime temperatures differed little among tunnel designs.
- Taxon
- cucumberCucumis sativust0
- Outcome
- differencese0
- Comparator
- different tunnelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“few differences between the different tunnels”
t0“cucumber”
Claim · model-written summary
Insect pest populations were lower under nethouses than open plots and rain shelters.
- Taxon
- cucumberCucumis sativust0
- Treatment
- nethousese0
- Interactor
- fruit fliese0pest
- Outcome
- Insect pest populationse0
- Direction
- lowere0
- Comparator
- open plots and under rain shelterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Insect pest populations were lower under nethouses than in open plots and under rain shelters, especially fruit flies”
t0“cucumber”
Claim · model-written summary
Small-mesh nethouses had higher marketable yields of 70.9 and 96.9 t.ha−1 than open tunnels and plots.
- Taxon
- cucumberCucumis sativust0
- Treatment
- nethouses with a small meshe0
- Outcome
- marketable yieldse0
- Direction
- Highere0
- Value
- 70.9 and 96.9 t.ha−1e0
- Qualifier
- 12.9 and 9.1 t.ha−1e0
- Comparator
- open tunnelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher marketable yields were obtained under nethouses with a small mesh (70.9 and 96.9 t.ha−1) and a large mesh (67.4 and 53.1 t.ha−1) than in open tunnels (12.9 and 9.1 t.ha−1) and in open plots (3.8 and 7.2 t.ha−1)”
t0“cucumber”
Claim · model-written summary
Large-mesh nethouses had higher marketable yields of 67.4 and 53.1 t.ha−1 than open tunnels and plots.
- Taxon
- cucumberCucumis sativust0
- Treatment
- a large meshe0
- Outcome
- marketable yieldse0
- Direction
- Highere0
- Value
- 67.4 and 53.1 t.ha−1e0
- Qualifier
- 3.8 and 7.2 t.ha−1e0
- Comparator
- open plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher marketable yields were obtained under nethouses with a small mesh (70.9 and 96.9 t.ha−1) and a large mesh (67.4 and 53.1 t.ha−1) than in open tunnels (12.9 and 9.1 t.ha−1) and in open plots (3.8 and 7.2 t.ha−1)”
t0“cucumber”
Claim · model-written summary
Nets, especially small mesh, were judged efficient protection against major cucumber pests.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- nets, especially with a small mesh sizee0
- Outcome
- efficient protection against major insect pestse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nets, especially with a small mesh size, provide versatile and efficient protection against major insect pests of cucumber”
Claim · model-written summary
Nets were judged to provide conditions conducive to cucumber development.
- Taxon
- cucumberCucumis sativust0
- Outcome
- conducive environment for the development of the crope0
- Qualifier
- local climatic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a conducive environment for the development of the crop under local climatic conditions”
t0“cucumber”
The same questions in other papers
protected cultivation · quality: postharvest · Cucumis sativus (cucumber)Positive and negative results
1 reporting no difference from an alternative
- no effect
protected cultivation · pest · Cucumis sativus (cucumber)Positive and negative results
1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
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.