Abstract
Summary The effects and interaction of gibberellic acid and nitrogen on pasture production, composition, and nitrogen levels were studied on a 2‐year‐old sward of ryegrass and white clover following mid‐April application when the natural growth rate was slow. The application of gibberellic acid caused a rapid stimulation of growth, reaching a maximum within four weeks. Fertiliser nitrogen was slower acting, but its production equalled that obtained from gibberellic acid six weeks after application. Over the subsequent six months gibberellic acid depressed yields significantly, while slight nitrogen responses continued. No significant interactions were recorded. Gibberellic acid caused yellowing of the herbage and stem elongation up to the first mowing, six weeks after application. Yield responses and depressions of individual species resulting from treatment with gibberellic acid are presented. There was evidence of an increase in sward density within six weeks of application. Gibberellic acid caused increased yields of nitrogen (oven‐dry material) up to six weeks after application. Samples taken fourteen weeks after application showed a lowering of nitrogen yields from the acid treatment.
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Claims 10
Claim · model-written summary
Gibberellic acid caused a rapid stimulation of pasture growth, reaching a maximum within four weeks.
- Taxon
- ryegrass and white clover
Trifolium repens
Loliume0 - Treatment
- gibberellic acide1
- Outcome
- growthe1
- Direction
- rapid stimulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e1“The application of gibberellic acid caused a rapid stimulation of growth, reaching a maximum within four weeks”
Claim · model-written summary
Fertiliser nitrogen production equalled that from gibberellic acid six weeks after application.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- Fertiliser nitrogene2
- Outcome
- productione2
- Direction
- equallede2
- Comparator
- gibberellic acide2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e2“Fertiliser nitrogen was slower acting, but its production equalled that obtained from gibberellic acid six weeks after application”
Claim · model-written summary
Gibberellic acid significantly depressed pasture yields over the subsequent six months.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- gibberellic acide3
- Outcome
- yieldse3
- Direction
- depressede3
- Qualifier
- Over the subsequent six monthse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e3“Over the subsequent six months gibberellic acid depressed yields significantly, while slight nitrogen responses continued”
Claim · model-written summary
Slight nitrogen responses continued over the six months after application.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Outcome
- nitrogen responsese3
- Direction
- continuede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e3“Over the subsequent six months gibberellic acid depressed yields significantly, while slight nitrogen responses continued”
Claim · model-written summary
No significant interactions between gibberellic acid and nitrogen were recorded.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Outcome
- interactionse4
- Direction
- No significante4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e4“No significant interactions were recorded”
Claim · model-written summary
Gibberellic acid caused yellowing of the pasture herbage up to the first mowing.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- gibberellic acide5
- Outcome
- yellowing of the herbagee5
- Direction
- causede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e5“Gibberellic acid caused yellowing of the herbage and stem elongation up to the first mowing, six weeks after application”
Claim · model-written summary
Gibberellic acid caused stem elongation of the pasture up to the first mowing.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- gibberellic acide5
- Outcome
- stem elongatione5
- Direction
- causede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e5“Gibberellic acid caused yellowing of the herbage and stem elongation up to the first mowing, six weeks after application”
Claim · model-written summary
Gibberellic acid caused increased nitrogen yields of pasture up to six weeks after application.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- gibberellic acide6
- Outcome
- yields of nitrogene6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e6“Gibberellic acid caused increased yields of nitrogen (oven‐dry material) up to six weeks after application”
Claim · model-written summary
Nitrogen yields were lowered by the acid treatment fourteen weeks after application.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Treatment
- the acid treatmente7
- Outcome
- nitrogen yieldse7
- Direction
- loweringe7
- Qualifier
- fourteen weeks after applicatione7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e7“Samples taken fourteen weeks after application showed a lowering of nitrogen yields from the acid treatment”
Claim · model-written summary
Sward density of the pasture increased within six weeks of application.
- Taxon
- ryegrass and white cloverTrifolium repensLoliume0
- Outcome
- sward densitye2
- Direction
- increasee2
- Qualifier
- within six weeks of applicatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2‐year‐old sward of ryegrass and white clover”
e2“There was evidence of an increase in sward density within six weeks of application”
The same questions in other papers
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- positive
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nitrogen · yield · Trifolium repens (white clover)Results differ
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See all 24 papers →fertilization · yield · Trifolium repens (white clover)Positive and negative results
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See all 27 papers →fertilization · yield · LoliumPositive and negative results
11 papers in the same direction as this paper · 38 reporting no difference from an alternative
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See all 50 papers →nitrogen · yield · LoliumPositive and negative results
11 papers in the same direction as this paper · 42 reporting no difference from an alternative
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See all 54 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.