Abstract
A comprehensive study to evaluate calcium, in terms of gypsum (CaSO4.2H2O) by soil dressing application, on enzymatic browning activity of Polyphenol oxidase (PPO) and internal qualities was tested on lettuce var. Grand Rapids under field conditions. A factorial in completely randomized design was arranged with four replications. The results showed that plants-treated with 50 mg kg(-1) gypsum applied at 40 DAP had the maximal fresh weight of 25.83 g plant(-1). The internal qualities of the lettuce at harvest showed that plants treated with 50 mg kg(-1) gypsum had the maximal chlorophyll content (26.80 mg m(-2)), while all gypsum concentrations applied in this study, had less content of ascorbic acid than the control plants. Plants-treated with 100 mg kg(-1) gypsum affected to the lowest level of PPO activity at week 3 after transplanting. Furthermore, gypsum application had no effect to biomass, leaf colour, the contents of phenolic and quinone in lettuce at harvesting stage.
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Claims 6
Claim · model-written summary
Lettuce treated with 50 mg kg(-1) gypsum applied at 40 DAP had the maximal fresh weight, 25.83 g plant(-1), in the field.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- 50 mg kg(-1) gypsum applied at 40 DAPe1
- Outcome
- fresh weighte1
- Direction
- maximale1
- Value
- 25.83 g plant(-1)e1
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“plants-treated with 50 mg kg(-1) gypsum applied at 40 DAP had the maximal fresh weight of 25.83 g plant(-1)”
Claim · model-written summary
Lettuce treated with 50 mg kg(-1) gypsum had the maximal chlorophyll content, 26.80 mg m(-2), at harvest.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 50 mg kg(-1) gypsume1
- Outcome
- chlorophyll contente1
- Direction
- maximale1
- Value
- 26.80 mg m(-2)e1
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“plants treated with 50 mg kg(-1) gypsum had the maximal chlorophyll content (26.80 mg m(-2))”
Claim · model-written summary
All gypsum concentrations applied gave lower ascorbic acid content in lettuce than control plants.
- Taxon
- lettuceLactuca sativae0
- Treatment
- all gypsum concentrationse1
- Outcome
- content of ascorbic acide1
- Direction
- lesse1
- Comparator
- control plantse1
- Setting
- field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“all gypsum concentrations applied in this study, had less content of ascorbic acid than the control plants”
Claim · model-written summary
Lettuce treated with 100 mg kg(-1) gypsum had the lowest PPO activity at week 3 after transplanting.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 100 mg kg(-1) gypsume1
- Outcome
- PPO activitye1
- Direction
- loweste1
- Qualifier
- week 3 after transplantinge1
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“Plants-treated with 100 mg kg(-1) gypsum affected to the lowest level of PPO activity at week 3 after transplanting”
Claim · model-written summary
Gypsum application had no effect on biomass or leaf colour of lettuce at harvest.
- Taxon
- lettuceLactuca sativae0
- Treatment
- gypsum applicatione1
- Outcome
- biomass, leaf coloure1
- Direction
- no effecte1
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“gypsum application had no effect to biomass, leaf colour”
Claim · model-written summary
Gypsum application had no effect on the phenolic and quinone contents of lettuce at harvesting stage.
- Taxon
- lettuceLactuca sativae0
- Treatment
- gypsum applicatione1
- Outcome
- the contents of phenolic and quinonee1
- Direction
- no effecte1
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce var. Grand Rapids under field conditions”
e1“gypsum application had no effect to biomass, leaf colour, the contents of phenolic and quinone in lettuce at harvesting stage”
The same questions in other papers
lime · growth · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
1 paper more in this group
See all 5 papers →lime · quality: postharvest · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- 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.