Abstract
Abstract The effect of level of nitrogen application upon the dynamics of herbage growth in a continuously grazed sward of tall fescue was investigated during two successive years. In order to obtain a large range of sward structural conditions, the experiments were carried out with two contrasting cultivars: cv. Clarìne and cv. Barcel, and, in Year 2, with two different sward heights or leaf area indices (LAIs). During each of five experimental periods (2‐3 weeks), swards received either optimum (N2) or deficient (N1) N applications, were maintained at their target LAI, and leaf growth was measured on labelled tillers. With continuously defoliated tillers, N‐shortage had only a small effect on the leaf elongation rate compared with tillers protected by cages. The leaf production per tiller was only slightly reduced by N shortage, and it was mainly by the means of a reduction in tiller density that the N deficiency resulted in reduced herbage growth per hectare. These results indicate that, in continuously grazed swards, in contrast with results previously found in intermittently defoliated swards, leaf elongation is not the only important component of difference in herbage growth and that the promotion of tillering rate is an additional pathway for N response in such management regimes.
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Claims 5
Claim · model-written summary
N shortage had only a small effect on leaf elongation rate of continuously defoliated tall fescue tillers compared with tillers protected by cages.
- Taxon
- tall fescue
Lolium arundinaceume0 - Treatment
- N‐shortagee1
- Outcome
- leaf elongation ratee1
- Comparator
- tillers protected by cagese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a continuously grazed sward of tall fescue”
e1“With continuously defoliated tillers, N‐shortage had only a small effect on the leaf elongation rate compared with tillers protected by cages”
Claim · model-written summary
N shortage slightly reduced leaf production per tall fescue tiller.
- Taxon
- tall fescueLolium arundinaceume0
- Treatment
- N shortagee2
- Outcome
- leaf production per tillere2
- Direction
- slightly reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a continuously grazed sward of tall fescue”
e2“The leaf production per tiller was only slightly reduced by N shortage”
Claim · model-written summary
N deficiency reduced herbage growth per hectare of tall fescue swards.
- Taxon
- tall fescueLolium arundinaceume0
- Treatment
- N deficiencye3
- Outcome
- herbage growth per hectaree3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a continuously grazed sward of tall fescue”
e3“the N deficiency resulted in reduced herbage growth per hectare”
Claim · model-written summary
The reduction in herbage growth under N deficiency works mainly through lower tiller density.
- Taxon
- tall fescueLolium arundinaceume0
- Treatment
- N deficiencye4
- Outcome
- herbage growth per hectaree4
- Qualifier
- mainly by the means of a reduction in tiller densitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a continuously grazed sward of tall fescue”
e4“it was mainly by the means of a reduction in tiller density that the N deficiency resulted in reduced herbage growth per hectare”
Claim · model-written summary
In continuously grazed tall fescue swards, promotion of tillering rate is an additional pathway for the N response, besides leaf elongation.
- Taxon
- tall fescueLolium arundinaceume0
- Outcome
- N responsee5
- Qualifier
- the promotion of tillering rate is an additional pathwaye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a continuously grazed sward of tall fescue”
e5“the promotion of tillering rate is an additional pathway for N response in such management regimes”
The same questions in other papers
nitrogen · growth · Lolium arundinaceum (tall fescue)Positive and negative results
13 papers in the same direction as this paper · 7 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- no effect
17 papers more in this group
See all 21 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.