Abstract
In the present study the effect of both nitrogen application rate and gibberellic acid (GA3) on yield and earliness of production and marketability (plant height and leaf color) of lettuce was examined. Three commercial cultivars [cv. 'Kismy' and 'Marady' (loose-leaf types) and cv. 'Adranita' (romaine type)] were cultivated in an unheated plastic greenhouse for three consecutive growing periods. During cultivation, four nitrogen rates (0, 150, 300 and 450 mg L-1 of N) and two foliar sprayings with two concentrations of GA3 (0 and 50 mg L-1 for the first and second sowing and 0 and 25 mg L-1 for the third sowing) were applied. Total fresh and dry weight significantly decreased and increased, respectively, by GA3 application, especially in the second sowing date, whereas high nitrogen rates (300 and 450 mg L-1) resulted in higher fresh weight (by 11.2%) and lower dry weight (by 7.5%) respectively. Plant height was significantly increased by GA3 application, except for cv. 'Adranita' in the third sowing date, whereas nitrogen application did not affect plant height for all the cultivars studied. The application of GA3 and high nitrogen rates resulted in an increase of the total number of leaves per plant and a decrease of chlorophyll content of leaves during the first sowing date and third sowing date. In conclusion, nitrogen application could be beneficial for total yield and the total number of leaves, whereas medium GA3 concentration (25 mg L-1) should be applied during spring (third sowing date) as it results in plants with higher number of leaves, total fresh weight (cv 'Kismy') and marketable height.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
GA3 significantly decreased lettuce fresh weight, especially at the second sowing.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- GA3 applicatione0
- Outcome
- Total freshe0
- Direction
- decreasede0
- Qualifier
- especially in the second sowing datee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total fresh and dry weight significantly decreased and increased, respectively, by GA3 application, especially in the second sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
GA3 significantly increased lettuce dry weight.
- Taxon
- lettuceLactuca sativat0
- Treatment
- GA3 applicatione0
- Outcome
- dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total fresh and dry weight significantly decreased and increased, respectively, by GA3 application, especially in the second sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
High nitrogen increased fresh weight by 11.2%.
- Taxon
- lettuceLactuca sativat0
- Treatment
- high nitrogen rates (300 and 450 mg L-1)e0
- Outcome
- fresh weighte0
- Direction
- highere0
- Value
- 11.2%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high nitrogen rates (300 and 450 mg L-1) resulted in higher fresh weight (by 11.2%) and lower dry weight (by 7.5%) respectively”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
High nitrogen lowered dry weight by 7.5%.
- Taxon
- lettuceLactuca sativat0
- Treatment
- high nitrogen rates (300 and 450 mg L-1)e0
- Outcome
- dry weighte0
- Direction
- lowere0
- Value
- 7.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high nitrogen rates (300 and 450 mg L-1) resulted in higher fresh weight (by 11.2%) and lower dry weight (by 7.5%) respectively”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
GA3 significantly increased plant height except in Adranita at the third sowing.
- Taxon
- lettuceLactuca sativat0
- Treatment
- GA3 applicatione0
- Outcome
- Plant heighte0
- Direction
- increasede0
- Qualifier
- except for cv. 'Adranita' in the third sowing datee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height was significantly increased by GA3 application, except for cv. 'Adranita' in the third sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
Nitrogen application did not affect plant height across the cultivars.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nitrogen applicatione0
- Outcome
- plant heighte0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application did not affect plant height for all the cultivars studied”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
GA3 increased leaf number per plant at the first and third sowings.
- Taxon
- lettuceLactuca sativat0
- Treatment
- GA3e0
- Outcome
- total number of leaves per plante0
- Direction
- increasee0
- Qualifier
- first sowing date and third sowing datee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of GA3 and high nitrogen rates resulted in an increase of the total number of leaves per plant and a decrease of chlorophyll content of leaves during the first sowing date and third sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
High nitrogen increased leaf number per plant at the first and third sowings.
- Taxon
- lettuceLactuca sativat0
- Treatment
- high nitrogen ratese0
- Outcome
- total number of leaves per plante0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of GA3 and high nitrogen rates resulted in an increase of the total number of leaves per plant and a decrease of chlorophyll content of leaves during the first sowing date and third sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
GA3 decreased leaf chlorophyll content at the first and third sowings.
- Taxon
- lettuceLactuca sativat0
- Treatment
- GA3e0
- Outcome
- chlorophyll content of leavese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of GA3 and high nitrogen rates resulted in an increase of the total number of leaves per plant and a decrease of chlorophyll content of leaves during the first sowing date and third sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
High nitrogen decreased leaf chlorophyll content at the first and third sowings.
- Taxon
- lettuceLactuca sativat0
- Treatment
- high nitrogen ratese0
- Outcome
- chlorophyll content of leavese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of GA3 and high nitrogen rates resulted in an increase of the total number of leaves per plant and a decrease of chlorophyll content of leaves during the first sowing date and third sowing date”
t0“lettuce (Lactuca sativa L.)”
Claim · model-written summary
The authors recommend medium GA3 in spring for more leaves, fresh weight in Kismy and marketable height.
- Taxon
- lettuceLactuca sativat0
- Treatment
- medium GA3 concentration (25 mg L-1)e0
- Outcome
- should be applied during spring (third sowing date)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“medium GA3 concentration (25 mg L-1) should be applied during spring (third sowing date) as it results in plants with higher number of leaves, total fresh weight (cv 'Kismy') and marketable height”
t0“lettuce (Lactuca sativa L.)”
The same questions in other papers
Gibberellic acid · growth · Lactuca sativa (garden lettuce)Results differ
35 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- no effect
41 papers more in this group
See all 45 papers →nitrogen · growth · Lactuca sativa (garden lettuce)Results differ
59 papers in the same direction as this paper · 22 in the opposite direction · 3 reporting no difference from an alternative
- positive
- no effect
- negative
81 papers more in this group
See all 85 papers →nitrogen · physiology: pigments · Lactuca sativa (garden lettuce)Positive and negative results
2 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 papers →nitrogen · yield · Lactuca sativa (garden lettuce)Positive and negative results
60 papers in the same direction as this paper · 17 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
75 papers more in this group
See all 79 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.