Abstract
Abstract Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture. Increased nutrient level added to the soil increased seed yield but did not give a corresponding increase in seedling performance. Hydroponically propagated seed, although heavier than soil propagated seed, were relatively poor in vigor and germinability. A positive linear correlation was found between N levels (5-15 meq) and seed yield, weight per seed, and seedling vigor. Amounts of amino acids and lipids were not positively correlated with nutrient supply, N level, or seedling vigor. Lettuce seed weight was a useful parameter in predicting seedling vigor only within a seed lot obtained from plants grown under the same environmental and nutritional conditions.
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Claims 7
Claim · model-written summary
Increased nutrient level added to the soil increased lettuce seed yield.
- Taxon
- Lactuca sativa L.
Lactuca sativae0 - Treatment
- Increased nutrient level added to the soile1
- Outcome
- seed yielde1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e1“Increased nutrient level added to the soil increased seed yield but did not give a corresponding increase in seedling performance”
Claim · model-written summary
Increased nutrient level added to the soil did not give a corresponding increase in seedling performance.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Treatment
- Increased nutrient level added to the soile1
- Outcome
- seedling performancee1
- Direction
- did not give a corresponding increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e1“Increased nutrient level added to the soil increased seed yield but did not give a corresponding increase in seedling performance”
Claim · model-written summary
Hydroponically propagated seed was heavier than soil propagated seed.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Treatment
- Hydroponically propagatede2
- Outcome
- seed weighte5
- Direction
- heaviere2
- Comparator
- soil propagated seede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e2“Hydroponically propagated seed, although heavier than soil propagated seed, were relatively poor in vigor and germinability”
e5“Lettuce seed weight was a useful parameter in predicting seedling vigor”
Claim · model-written summary
Hydroponically propagated seed was relatively poor in vigor and germinability compared with soil propagated seed.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Treatment
- Hydroponically propagatede2
- Outcome
- vigor and germinabilitye2
- Direction
- poore2
- Comparator
- soil propagated seede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e2“Hydroponically propagated seed, although heavier than soil propagated seed, were relatively poor in vigor and germinability”
Claim · model-written summary
N levels of 5-15 meq were positively correlated with seed yield, weight per seed and seedling vigor.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Treatment
- N levels (5-15 meq)e3
- Outcome
- seed yield, weight per seed, and seedling vigore3
- Direction
- positivee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e3“A positive linear correlation was found between N levels (5-15 meq) and seed yield, weight per seed, and seedling vigor”
Claim · model-written summary
Amounts of amino acids and lipids in lettuce seed were not positively correlated with nutrient supply.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Treatment
- nutrient supplye4
- Outcome
- Amounts of amino acids and lipidse4
- Direction
- not positively correlatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e4“Amounts of amino acids and lipids were not positively correlated with nutrient supply, N level, or seedling vigor”
Claim · model-written summary
Seed weight predicted seedling vigor only within a seed lot grown under the same environmental and nutritional conditions.
- Taxon
- Lactuca sativa L.Lactuca sativae0
- Material
- seed lote5
- Outcome
- seedling vigore5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce, Lactuca sativa L., plants were grown in soil irrigated at various intervals with nutrient solution and in hydroponics culture”
e5“Lettuce seed weight was a useful parameter in predicting seedling vigor only within a seed lot obtained from plants grown under the same environmental and nutritional conditions”
The same questions in other papers
cultivation system · growth · Lactuca sativa (garden lettuce)Positive and negative results
8 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
21 papers more in this group
See all 25 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.