Abstract
Abstract The effect of nitrogen, phosphorus and potassium nutrition on average seed weight, oil content and fatty acid composition of rape seed ( Brassica napus ) grown in soil‐free culture has been studied. Nitrogen effected an increase in seed weight and a decrease in oil content, while the average amount of oil per seed remained constant. A small, but highly significant, decrease in palmitic and eicosenoic acid content, a significant decrease in oleic acid and a highly significant increase in erucic acid content were observed. This suggests that a decrease in the extent of elongation of oleic acid to erucic acid occurs in seeds developing on plants with sub‐optimal levels of nitrogen nutrition. Phosphorus and potassium had very limited effects on fatty acid composition. Significant differences were found only in oleic acid content for phosphorus alone, the nitrogen‐phosphorus interaction and the phosphorus‐potassium interaction. The effect of various levels of sulfate at optimal levels for nitrogen, phosphorus and potassium, was studied in a separate experiment. Seed from sulfur‐starved plants had decreased oil content; oleic acid percentages were increased and erucic acid percentages decreased. Excessive amounts of sulfate had no effect on fatty acid composition.
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Claims 13
Claim · model-written summary
Nitrogen increased seed weight.
- Taxon
- rape seed
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- Nitrogene0
- Outcome
- seed weighte0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Nitrogen effected an increase in seed weight and a decrease in oil content, while the average amount of oil per seed remained constant”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Nitrogen decreased oil content.
- Taxon
- rape seedBrassica napust0
- Treatment
- Nitrogene0
- Outcome
- oil contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen effected an increase in seed weight and a decrease in oil content, while the average amount of oil per seed remained constant”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Oil per seed remained constant under nitrogen nutrition.
- Taxon
- rape seedBrassica napust0
- Treatment
- Nitrogene0
- Outcome
- average amount of oil per seede0
- Direction
- remained constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen effected an increase in seed weight and a decrease in oil content, while the average amount of oil per seed remained constant”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Palmitic acid content decreased.
- Taxon
- rape seedBrassica napust0
- Outcome
- palmitice0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A small, but highly significant, decrease in palmitic and eicosenoic acid content”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Eicosenoic acid content decreased.
- Taxon
- rape seedBrassica napust0
- Outcome
- eicosenoic acid contente0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A small, but highly significant, decrease in palmitic and eicosenoic acid content”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Oleic acid content decreased.
- Taxon
- rape seedBrassica napust0
- Outcome
- oleic acide0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant decrease in oleic acid”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Erucic acid content increased.
- Taxon
- rape seedBrassica napust0
- Outcome
- erucic acid contente0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a highly significant increase in erucic acid content”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Phosphorus and potassium had limited effects on fatty acid composition.
- Taxon
- rape seedBrassica napust0
- Treatment
- Phosphorus and potassiume0
- Outcome
- fatty acid compositione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus and potassium had very limited effects on fatty acid composition”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Phosphorus and nutrient interactions significantly differed for oleic acid.
- Taxon
- rape seedBrassica napust0
- Treatment
- phosphoruse0
- Outcome
- oleic acid contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were found only in oleic acid content for phosphorus alone, the nitrogen‐phosphorus interaction and the phosphorus‐potassium interaction”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Sulfur-starved seed had decreased oil content.
- Taxon
- rape seedBrassica napust0
- Treatment
- sulfur‐starvede0
- Outcome
- oil contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed from sulfur‐starved plants had decreased oil content”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Sulfur starvation increased oleic acid percentage.
- Taxon
- rape seedBrassica napust0
- Treatment
- sulfur‐starvede1
- Outcome
- oleic acid percentagese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oleic acid percentages were increased and erucic acid percentages decreased”
e1“Seed from sulfur‐starved plants”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Sulfur starvation decreased erucic acid percentage.
- Taxon
- rape seedBrassica napust0
- Treatment
- sulfur‐starvede1
- Outcome
- erucic acid percentagese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oleic acid percentages were increased and erucic acid percentages decreased”
e1“Seed from sulfur‐starved plants”
t0“rape seed ( Brassica napus )”
Claim · model-written summary
Excess sulfate did not change fatty acid composition.
- Taxon
- rape seedBrassica napust0
- Treatment
- Excessive amounts of sulfatee0
- Outcome
- fatty acid compositione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excessive amounts of sulfate had no effect on fatty acid composition”
t0“rape seed ( Brassica napus )”
The same questions in other papers
sulfate · quality: oil · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- no effect
nitrogen · yield · Brassica napus (oilseed rape)Positive and negative results
197 papers in the same direction as this paper · 34 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- positive
235 papers more in this group
See all 239 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.