Abstract
SUMMARY The effects of two levels each of nitrogen and sulphur nutrition and of infestation by Brevicoryne brassicae on the growth of Brussels sprout plants were studied in factorial experiments. All the plants receiving high nitrogen treatments grew more rapidly than those with low, but in infested plants the improvement in growth at the higher levels of nitrogen was offset by the increased size of aphid populations. Low sulphur nutrition increased the growth of plants receiving high nitrogen and of the aphids feeding on them. Leaf diffusive resistances and chlorophyll concentrations were greater with high nitrogen, but were significantly lowered by infestation in all nutrient treatments. Infestation decreased leaf total nitrogen concentration at the sites of feeding, but effects on soluble nitrogen were not significant. Removal of aphids 72 days after initial infestation did not cause marked plant recovery during the next 22 days. It is concluded that the benefits of increased yield resulting from high nitrogen levels must be balanced against the greater potential for damage by aphids.
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Claims 10
Claim · model-written summary
High nitrogen increased plant growth relative to low nitrogen.
Verbatim
e0“All the plants receiving high nitrogen treatments grew more rapidly than those with low”
Claim · model-written summary
In infested plants, greater aphid populations offset the high-nitrogen growth benefit.
Verbatim
e0“in infested plants the improvement in growth at the higher levels of nitrogen was offset by the increased size of aphid populations”
Claim · model-written summary
Low sulphur increased growth of high-nitrogen plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- Low sulphur nutritione0
- Outcome
- growthe0
- Direction
- increasede0
- Qualifier
- receiving high nitrogene0
Not reportedComparator
Verbatim
e0“Low sulphur nutrition increased the growth of plants receiving high nitrogen”
Claim · model-written summary
Low sulphur increased growth of aphids feeding on high-nitrogen plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- Low sulphur nutritione0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- growth of plants receiving high nitrogen and of the aphidse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Low sulphur nutrition increased the growth of plants receiving high nitrogen and of the aphids feeding on them”
Claim · model-written summary
High nitrogen increased leaf diffusive resistance and chlorophyll concentration.
- Treatment
- high nitrogene0
- Outcome
- Leaf diffusive resistances and chlorophyll concentrationse0
- Direction
- greatere0
Not reportedTaxonComparator
Verbatim
e0“Leaf diffusive resistances and chlorophyll concentrations were greater with high nitrogen”
t0“Brussels sprout plants”
Claim · model-written summary
Aphid infestation significantly lowered leaf diffusive resistance and chlorophyll concentration across nutrient treatments.
- Treatment
- infestatione0
- Outcome
- Leaf diffusive resistances and chlorophyll concentrationse0
- Direction
- lowerede0
- Qualifier
- all nutrient treatmentse0
Not reportedTaxonInteractorComparator
Verbatim
e0“Leaf diffusive resistances and chlorophyll concentrations were greater with high nitrogen, but were significantly lowered by infestation in all nutrient treatments”
t0“Brussels sprout plants”
Claim · model-written summary
Infestation reduced total leaf nitrogen at feeding sites.
- Organ / stage
- leafe0
- Treatment
- Infestatione0
- Outcome
- leaf total nitrogen concentratione0
- Direction
- decreasede0
- Qualifier
- at the sites of feedinge0
Not reportedTaxonComparator
Verbatim
e0“Infestation decreased leaf total nitrogen concentration at the sites of feeding”
t0“Brussels sprout plants”
Claim · model-written summary
Infestation effects on soluble nitrogen were not significant.
- Outcome
- soluble nitrogene0
Not reportedTaxonTreatmentComparatorDirection
Verbatim
e0“effects on soluble nitrogen were not significant”
t0“Brussels sprout plants”
Claim · model-written summary
Removing aphids at day 72 caused no marked plant recovery over the next 22 days.
- Treatment
- Removal of aphids 72 days after initial infestatione0
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- plant recoverye0
- Direction
- did not cause markede0
- Qualifier
- during the next 22 dayse0
Not reportedTaxonComparator
Verbatim
e0“Removal of aphids 72 days after initial infestation did not cause marked plant recovery during the next 22 days”
t0“Brussels sprout plants”
Claim · model-written summary
High-nitrogen yield benefits should be balanced against increased aphid damage potential.
- Interactor
- aphidsAphidomorphae0pest
- Outcome
- benefits of increased yield resulting from high nitrogen levels must be balanced against the greater potential for damage by aphidse0
Not reportedTaxon
Verbatim
e0“the benefits of increased yield resulting from high nitrogen levels must be balanced against the greater potential for damage by aphids”
t0“Brussels sprout plants”
The same questions in other papers
sulfur atom · growth · Viridiplantae (plants)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- 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.