Abstract
The intensity of ultraviolet (UV) radiation affects the yield and quality of red lettuce. The current study aimed to develop a UV management system in a greenhouse to achieve high yield and quality in red lettuce production. The study consisted of two experiments. In the first experiment, the effects of the different UV transparencies of the plastic materials covering the greenhouse on plant growth and the concentration of antioxidants in red lettuce were studied. For this purpose, two greenhouses were covered with polyethene of different transparencies to UV radiation. One greenhouse was covered with a common type of polyethene transparent in a large spectrum of UV radiation (UV-open), while the second greenhouse was covered with polyethene untransparent to ultraviolet radiation (UV-block). The plants were grown in a deep flotation hydroponic system. At the end of the cultivation, plant growth measurements, leaf colour measurements, and the determination of antioxidant components’ concentration were carried out. Red lettuce plants harvested 42 days after planting had an average head weight 42% greater in the UV-block greenhouse compared to plants grown in the UV-open greenhouse. However, the red leaf colour of plants in the UV-block greenhouse lagged significantly compared to that in the UV-open greenhouse. Moreover, the total phenolic content, the total flavonoid content, and the antioxidant capacity of the lettuce leaves in the UV-block greenhouse were significantly lower compared to the corresponding values of the plants in the UV-open greenhouse. During the second experiment, a new cultivation system of red lettuce, which combined a UV-block polyethene film as a greenhouse cover and a pre-harvested supplemental UV light, was tested. For this purpose, various doses of supplemental UV lighting were tested in the UV-block greenhouse for ten days prior to harvest. From these tests, it emerged that applying supplemental UV lighting with a dose of 425 kJ m−2 d−1 for ten days before harvest produces red lettuces of the same quality as those produced in a UV-open greenhouse. This technique of growing red lettuce increases its yield by 30% without a negative effect on the quality of the product.
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Claims 5
Claim · model-written summary
UV blocking increased head weight by 42% relative to UV open cover.
Verbatim
e0“Red lettuce plants harvested 42 days after planting had an average head weight 42% greater in the UV-block greenhouse compared to plants grown in the UV-open greenhouse.”
Claim · model-written summary
UV blocking reduced red leaf colour relative to UV open cover.
Verbatim
e0“However, the red leaf colour of plants in the UV-block greenhouse lagged significantly compared to that in the UV-open greenhouse.”
Claim · model-written summary
UV blocking lowered total phenolic content, total flavonoid content and antioxidant capacity.
- Taxon
- lettuce
Lactuca sativae0 - Organ / stage
- leavese0
- Treatment
- UV-block greenhousee0
- Outcome
- total phenolic content, the total flavonoid content, and the antioxidant capacitye0
- Direction
- lowere0
- Comparator
- UV-open greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, the total phenolic content, the total flavonoid content, and the antioxidant capacity of the lettuce leaves in the UV-block greenhouse were significantly lower compared to the corresponding values of the plants in the UV-open greenhouse.”
Claim · model-written summary
Supplemental UV under UV blocking produced lettuce of the same quality as UV open cover.
Verbatim
e0“applying supplemental UV lighting with a dose of 425 kJ m−2 d−1 for ten days before harvest produces red lettuces of the same quality as those produced in a UV-open greenhouse.”
Claim · model-written summary
The combined UV management technique increased lettuce yield by 30%.
- Taxon
- red lettucee0
- Treatment
- This technique of growing red lettucee0
- Outcome
- yielde0
- Direction
- increasese0
- Value
- 30%e0
Not reportedComparator
Verbatim
e0“This technique of growing red lettuce increases its yield by 30% without a negative effect on the quality of the product.”
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See all 14 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.