Abstract
Abstract The productivity of a mixed sward comprising perennial ryegrass cv. Fantoom and white clover cv. Aran was measured under eight defoliation management systems and two fertilizer N rates (0 and 75 kg ha ‐1 ) applied in spring. The defoliations involved a basic six‐harvest simulated grazing system together with the interposition of silage cuts once or twice at varying times during the growing season; evaluation was made over three harvest years, 1983‐85. Mean annual production of total herbage DM over the three years was 8.351 tha ‐1 without N and 9.49 tha ‐1 with 75 kg N ha ‐1 , a mean response of 15.2 kg DM per kg applied N. The responses for individual treatments occurred mainly at the first cuts, whether for simulated grazing (a mean of 12 9 kg DM) or for silage (a mean of 259 kg DM); however, this influence of spring N was not sustained at other cuts over the season. Mean annual white clover DM production was 4.19 t ha ‐1 with no N and 3.32 t ha ‐1 with 75 kg ha ‐1 N, but the reduction due to N was not significant in any year. The mean amount of clover stolon DM present post harvest over all management systems was 1.33 t ha ‐1 with no N and 1.03 t ha ‐1 with 75 kg ha ‐1 N. Mean annual DM production of total herbage from the six‐harvest system was 8.11 t ha ‐1 Compared with 8 88 t ha ‐1 (a 9% increase) from the systems with one silage cut and 9.241 ha ‐1 (a 14% increase) from the systems with two silage cuts. Corresponding white clover DM production was 4.02, 3 87 and 3 53 t ha ‐1 , respectively, and mean stolon DM amounts post harvest, 1 12,1.15 and 1‐23 t ha ‐1 , respectively. It is concluded that grass/white clover swards are suitable for management systems which involve cutting for conservation. Spring N application did not greatly reduce white clover production in this experiment where white clover was at higher levels than are likely in farming practice and the swards were not grazed. More knowledge of spring N rates, and indeed of N application rates generally, would be advantageous in future assessment of silage cutting systems.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Spring N application increased total herbage DM production of the ryegrass/white clover sward, with a mean response of 15.2 kg DM per kg applied N.
- Taxon
- perennial ryegrass
Lolium perennee1 - Treatment
- applied Ne2
- Outcome
- total herbage DMe3
- Direction
- increaseinferrede2
- Value
- 15.2 kg DM per kg applied Ne2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a mixed sward comprising perennial ryegrass cv. Fantoom and white clover cv. Aran”
e2“a mean response of 15.2 kg DM per kg applied N”
e3“Mean annual production of total herbage DM over the three years was”
Claim · model-written summary
Spring N application reduced white clover DM production, but not significantly.
- Taxon
- white clover
Trifolium repense1 - Treatment
- due to Ne4
- Outcome
- white clover DM productione5
- Direction
- reductione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a mixed sward comprising perennial ryegrass cv. Fantoom and white clover cv. Aran”
e4“the reduction due to N was not significant in any year”
e5“Mean annual white clover DM production was”
Claim · model-written summary
One silage cut in the sward system increased total herbage DM by 9% relative to the basic six-harvest system.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- one silage cute6
- Outcome
- total herbage DMe3
- Direction
- increasee6
- Value
- 9%e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a mixed sward comprising perennial ryegrass cv. Fantoom and white clover cv. Aran”
e6“(a 9% increase) from the systems with one silage cut”
e3“Mean annual production of total herbage DM over the three years was”
Claim · model-written summary
Two silage cuts in the sward system increased total herbage DM by 14% relative to the basic six-harvest system.
- Taxon
- perennial ryegrassLolium perennee1
- Treatment
- two silage cutse7
- Outcome
- total herbage DMe3
- Direction
- increasee7
- Value
- 14%e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a mixed sward comprising perennial ryegrass cv. Fantoom and white clover cv. Aran”
e7“(a 14% increase) from the systems with two silage cuts”
e3“Mean annual production of total herbage DM over the three years was”
Claim · model-written summary
Grass/white clover swards are suitable for management systems that involve cutting for conservation.
- Taxon
- white cloverTrifolium repense1
- Outcome
- suitable for management systems which involve cutting for conservatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“grass/white clover swards are suitable for management systems which involve cutting for conservation”
Claim · model-written summary
Spring N application did not greatly reduce white clover production in this experiment.
- Taxon
- white cloverTrifolium repense1
- Treatment
- Spring N applicatione1
- Outcome
- white clover productione1
- Direction
- did not greatly reducee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Spring N application did not greatly reduce white clover production in this experiment”
The same questions in other papers
nitrogen · yield · Trifolium repens (white clover)Results differ
12 papers in the same direction as this paper · 11 in the opposite direction
- negative
- negative
- positive
20 papers more in this group
See all 24 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.