Abstract
Abstract Over three grazing seasons (1984‐1986) a sward of perennial ryegrass, cv. Talbot, which received a total of 336 kg N ha ‐1 each season, was cut or grazed with ewes at 3‐ or 4‐week intervals on a rotational basis. Sward productivity was higher under cutting than under grazing irrespective of the interval between defoliations. Under cutting, mean herbage organic matter (OM) yields over both intervals were 8·66, 9·62 and 8·17 t ha‐ 1 in 1984, 1985 and 1986 respectively while under grazing the corresponding yields were 7·65, 8·63 and 7·50 t ha ‐1 . The mean annual yield of herbage defoliated at 3‐week intervals was 7·50, 8·64 and 7 ·20 t OM ha ‐1 compared with 8·80, 9·60 and 8·46 t OM ha ‐1 for swards defoliated at 4‐week intervals in the three years respectively. The nitrogen (N) content of both the available and the residual herbage was consistently higher under grazing than under cutting. Available herbage contained 31·3 and 27·7 g N kg OM ‐1 and residual herbage 26·1 and 22·7 g N kg OM ‐1 under grazing and cutting respectively. The mean yield of N under cutting was 284 kg ha ‐1 compared with 304 kg ha ‐1 under grazing. Defoliation interval had no effect on N yield, the overall mean yield being 294 kg ha ‐1 under both 3‐ and 4‐week defoliation intervals. The effect of the treatments on tiller population was slight and inconclusive. The process of grazing reduced yield probably as a result of damage to the sward through trampling; the positive effect of excretal N on yield was minimal on account of the short grazing periods.
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Claims 8
Claim · model-written summary
Sward productivity was higher under cutting than under grazing irrespective of defoliation interval.
- Taxon
- perennial ryegrass
Lolium perennee0 - Treatment
- cuttinge1
- Outcome
- Sward productivitye1
- Direction
- highere1
- Comparator
- grazinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e1“Sward productivity was higher under cutting than under grazing irrespective of the interval between defoliations”
Claim · model-written summary
Swards defoliated at 4-week intervals gave higher mean annual herbage yield than those defoliated at 3-week intervals.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- swards defoliatede2
- Outcome
- mean annual yielde2
- Direction
- higherinferrede2
- Comparator
- herbage defoliatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e2“The mean annual yield of herbage defoliated at 3‐week intervals was 7·50, 8·64 and 7 ·20 t OM ha ‐1 compared with 8·80, 9·60 and 8·46 t OM ha ‐1 for swards defoliated at 4‐week intervals in the three years respectively”
Claim · model-written summary
Herbage N content was higher under grazing than under cutting.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- grazinge4
- Outcome
- nitrogen (N) contente4
- Direction
- highere4
- Comparator
- cuttinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e4“The nitrogen (N) content of both the available and the residual herbage was consistently higher under grazing than under cutting”
Claim · model-written summary
N yield was higher under grazing than under cutting.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- grazinge5
- Outcome
- yield of Ne5
- Direction
- higherinferrede5
- Comparator
- cuttinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e5“The mean yield of N under cutting was 284 kg ha ‐1 compared with 304 kg ha ‐1 under grazing”
Claim · model-written summary
Defoliation interval had no effect on N yield of the ryegrass sward.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- Defoliation intervale3
- Outcome
- N yielde3
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e3“Defoliation interval had no effect on N yield, the overall mean yield being 294 kg ha ‐1 under both 3‐ and 4‐week defoliation intervals”
Claim · model-written summary
Cutting and grazing had a slight and inconclusive effect on tiller population.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- the treatmentse6
- Outcome
- tiller populatione6
- Direction
- slight and inconclusivee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e6“The effect of the treatments on tiller population was slight and inconclusive”
Claim · model-written summary
Grazing probably reduced sward yield through trampling damage.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- grazinge7
- Outcome
- yielde7
- Qualifier
- damage to the sward through tramplinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e7“The process of grazing reduced yield probably as a result of damage to the sward through trampling; the positive effect of excretal N on yield was minimal on account of the short grazing periods”
Claim · model-written summary
The positive effect of excretal N on herbage yield was minimal.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- excretal Ne7
- Outcome
- yielde7
- Direction
- minimale7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a sward of perennial ryegrass, cv. Talbot”
e7“The process of grazing reduced yield probably as a result of damage to the sward through trampling; the positive effect of excretal N on yield was minimal on account of the short grazing periods”
The same questions in other papers
pruning · yield · Lolium perenne (perennial ryegrass)Positive and negative results
21 papers in the same direction as this paper · 15 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- positive
- positive
35 papers more in this group
See all 39 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.