Abstract
ABSTRACT The objective of this study was to compare the effect of one or two applications of gibberellic acid (GA) or nitrogen (N) fertiliser on dry matter (DM) yield and composition of perennial ryegrass‐white clover pasture. Pasture was treated with 0 or 8 g a.i./ha of GA and 0 or 50 kg/ha N fertiliser in a 2 × 2 factorial design in late winter and spring. One application of N fertiliser increased DM yield by increasing leaf mass and tiller density of perennial ryegrass while one application of GA increased DM yield by increasing perennial ryegrass and white clover yield. There was no DM yield response to two applications of GA, though two applications of N did increase DM yield. A single GA application in late winter increased fibre and reduced protein concentration in ryegrass. The use of GA to increase DM yield with reduced herbage protein concentration may have reduced environmental impact through reducing N intake of livestock.
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Claims 7
Claim · model-written summary
One GA application increased pasture dry matter yield by increasing perennial ryegrass and white clover yield.
- Taxon
- perennial ryegrass and white clover
Trifolium repens
Lolium perennee2 - Treatment
- one application of GAe2
- Outcome
- DM yielde2
- Direction
- increasede2
- Setting
- late winter and springe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“while one application of GA increased DM yield by increasing perennial ryegrass and white clover yield”
e3“Pasture was treated with 0 or 8 g a.i./ha of GA and 0 or 50 kg/ha N fertiliser in a 2 × 2 factorial design in late winter and spring”
Claim · model-written summary
Two GA applications produced no dry matter yield response.
- Taxon
- perennial ryegrassLolium perennee2
- Treatment
- two applications of GAe5
- Outcome
- DM yielde5
- Direction
- no_changeinferrede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“There was no DM yield response to two applications of GA”
e2“while one application of GA increased DM yield by increasing perennial ryegrass and white clover yield”
Claim · model-written summary
One N fertiliser application increased pasture dry matter yield by increasing leaf mass and tiller density of perennial ryegrass.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- One application of N fertilisere1
- Outcome
- DM yielde1
- Direction
- increasede1
- Qualifier
- by increasing leaf mass and tiller densitye1
- Setting
- late winter and springe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“One application of N fertiliser increased DM yield by increasing leaf mass and tiller density of perennial ryegrass”
e3“Pasture was treated with 0 or 8 g a.i./ha of GA and 0 or 50 kg/ha N fertiliser in a 2 × 2 factorial design in late winter and spring”
Claim · model-written summary
Two N fertiliser applications increased pasture dry matter yield.
- Taxon
- perennial ryegrassLolium perennee2
- Treatment
- two applications of Ne6
- Outcome
- DM yielde6
- Direction
- increasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“though two applications of N did increase DM yield”
e2“while one application of GA increased DM yield by increasing perennial ryegrass and white clover yield”
Claim · model-written summary
A single GA application in late winter increased ryegrass fibre concentration.
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A single GA application in late winter increased fibre and reduced protein concentration in ryegrass”
Claim · model-written summary
A single GA application in late winter reduced ryegrass protein concentration.
- Treatment
- A single GA applicatione4
- Outcome
- protein concentratione4
- Direction
- reducede4
- Setting
- late wintere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A single GA application in late winter increased fibre and reduced protein concentration in ryegrass”
Claim · model-written summary
Using GA to increase DM yield with reduced herbage protein concentration may reduce environmental impact by reducing N intake of livestock.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennee2
- Treatment
- The use of GAe7
- Outcome
- environmental impacte7
- Qualifier
- through reducing N intake of livestocke7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The use of GA to increase DM yield with reduced herbage protein concentration may have reduced environmental impact through reducing N intake of livestock”
e2“while one application of GA increased DM yield by increasing perennial ryegrass and white clover yield”
The same questions in other papers
Gibberellic acid · growth · Trifolium repens (white clover)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
Gibberellic acid · growth · Lolium perenne (perennial ryegrass)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
nitrogen · growth · Lolium perenne (perennial ryegrass)Results differ
19 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- no effect
25 papers more in this group
See all 29 papers →fertilization · growth · Lolium perenne (perennial ryegrass)Positive and negative results
27 papers in the same direction as this paper · 5 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- negative
31 papers more in this group
See all 35 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.