Abstract
The aim of this study was to investigate the effect of macro-anion (NO 3 , H 2 PO 4 , and SO 4 2) and macro-cation (K + , Ca 2+ and Mg 2+ ) proportions in the nutrient solution during two consecutive growing seasons (spring and summer) on yield and leaf quality (chlorophyll content, color parameters, carbohydrates and mineral composition) of Lactuca sativa L. var. acephala grown in a floating system. Marketable yield, shoot biomass and leaf area index were unaffected by nutrient solution composition. A high proportion of calcium in the nutrient solution increased the quality attributes in particular calcium, chlorophyll, glucose and fructose concentrations. Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index), leaf mineral content (N, K and Mg), total carotenoids and water use efficiency than those grown in the summer season but were influenced positively by some quality parameters (higher content of glucose and fructose and lower nitrate content). The results demonstrated, that the effect of growing season on leafy lettuce performance (yield and quality) was more pronounced than the effect of nutrient solution composition.
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Claims 9
Claim · model-written summary
Nutrient solution composition did not affect marketable yield, shoot biomass or leaf area index.
- Taxon
- Lactuca sativa L. var. acephala
Lactuca sativae1 - Treatment
- nutrient solution compositione0
- Outcome
- Marketable yield, shoot biomass and leaf area indexe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketable yield, shoot biomass and leaf area index were unaffected by nutrient solution composition”
e1“Lactuca sativa L. var. acephala”
Claim · model-written summary
A high calcium proportion increased leaf calcium and chlorophyll concentrations.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae1
- Treatment
- A high proportion of calcium in the nutrient solutione0
- Outcome
- calcium, chlorophylle0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A high proportion of calcium in the nutrient solution increased the quality attributes in particular calcium, chlorophyll, glucose and fructose concentrations”
e1“Lactuca sativa L. var. acephala”
Claim · model-written summary
A high calcium proportion increased leaf glucose and fructose concentrations.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae1
- Treatment
- A high proportion of calcium in the nutrient solutione0
- Outcome
- glucose and fructose concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A high proportion of calcium in the nutrient solution increased the quality attributes in particular calcium, chlorophyll, glucose and fructose concentrations”
e1“Lactuca sativa L. var. acephala”
Claim · model-written summary
Spring plants had lower yield, total dry biomass and leaf area index than summer plants.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae2
- Treatment
- spring seasone0
- Outcome
- yield, growth (total dry biomass and leaf area index)e0
- Direction
- lowere0
- Comparator
- summer seasone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index)”
e1“than those grown in the summer season”
e2“Lactuca sativa L. var. acephala”
Claim · model-written summary
Spring plants had lower leaf N, K and Mg content than summer plants.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae2
- Treatment
- spring seasone1
- Outcome
- leaf mineral content (N, K and Mg)e1
- Direction
- lowere1
- Comparator
- summer seasone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf mineral content (N, K and Mg)”
e1“Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index), leaf mineral content (N, K and Mg), total carotenoids and water use efficiency than those grown in the summer season”
e2“Lactuca sativa L. var. acephala”
Claim · model-written summary
Spring plants had lower total carotenoids and water use efficiency than summer plants.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae1
- Treatment
- spring seasone0
- Outcome
- total carotenoids and water use efficiencye0
- Direction
- lowere0
- Comparator
- summer seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index), leaf mineral content (N, K and Mg), total carotenoids and water use efficiency than those grown in the summer season”
e1“Lactuca sativa L. var. acephala”
Claim · model-written summary
Spring plants had higher glucose and fructose content than summer plants.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae2
- Treatment
- spring seasone1
- Outcome
- content of glucose and fructosee0
- Direction
- highere0
- Comparator
- summer seasone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher content of glucose and fructose and lower nitrate content”
e1“Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index), leaf mineral content (N, K and Mg), total carotenoids and water use efficiency than those grown in the summer season but were influenced positively by some quality parameters (higher content of glucose and fructose and lower nitrate content)”
e2“Lactuca sativa L. var. acephala”
Claim · model-written summary
Spring plants had lower nitrate content than summer plants.
- Taxon
- Lactuca sativa L. var. acephalaLactuca sativae1
- Treatment
- spring seasone0
- Outcome
- nitrate contente0
- Direction
- lowere0
- Comparator
- summer seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in the spring season exhibited a lower yield, growth (total dry biomass and leaf area index), leaf mineral content (N, K and Mg), total carotenoids and water use efficiency than those grown in the summer season but were influenced positively by some quality parameters (higher content of glucose and fructose and lower nitrate content)”
e1“Lactuca sativa L. var. acephala”
Claim · model-written summary
Growing season had a more pronounced effect on performance than nutrient solution composition.
- Taxon
- leafy lettucee0
- Outcome
- leafy lettuce performance (yield and quality)e0
- Direction
- more pronouncede0
- Comparator
- nutrient solution compositione0
Not reportedSetting
Verbatim
e0“effect of growing season on leafy lettuce performance (yield and quality) was more pronounced than the effect of nutrient solution composition”
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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.