Abstract
Abstract The productivity of permanent swards of mixed species composition was compared with that of sown Lolium perenne , cv. Melle at five fertilizer‐N rates (0, 150, 300, 450 and 900 kg N ha −1 ) and with L. perenne/Trifolium repens , cv. Grasslands Huia at 0 kg N ha −1 . The investigation was conducted under two cutting frequencies at sixteen sites in England and Wales, representing a range of grassland environments. Annual total herbage dry matter (DM) production from both permanent and reseeded swards increased with successive increments of fertilizer‐N up to 450 kg N ha −1 . Herbage DM production from reseeded swards in the first year after sowing was signficantly higher than from the permanent swards, at all fertilizer‐N treatments. In subsequent years the production advantage of the L. perenne reseeds was maintained only at the higher N rates, though sown L. perenne/T. repens was the most productive sward type at 0 N. Average differences in modified acid‐detergent fibre suggested small advantages in herbage quality to the reseeded swards. It is concluded that, while reseeded swards are more productive in the year after sowing, many permanent swards are capable of high levels of production and that reseeding to a L. perenne sward cannot always be justified, particularly for grassland receiving low or moderate inputs of fertilizer‐N.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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
Herbage dry matter production increased with fertilizer nitrogen increments up to 450 kg N ha −1.
- Treatment
- fertilizer‐N up to 450 kg N ha −1e0
- Outcome
- herbage dry matter (DM) productione0
- Direction
- increasede0
- Comparator
- successive increments of fertilizer‐Ne0
Not reportedTaxon
Verbatim
e0“Annual total herbage dry matter (DM) production from both permanent and reseeded swards increased with successive increments of fertilizer‐N up to 450 kg N ha −1 .”
Claim · model-written summary
Reseeded swards produced significantly more herbage dry matter than permanent swards in the first year at all nitrogen treatments.
- Treatment
- reseeded swardse0
- Outcome
- Herbage DM productione0
- Direction
- highere0
- Qualifier
- first year after sowinge0
- Comparator
- permanent swardse0
Not reportedTaxon
Verbatim
e0“Herbage DM production from reseeded swards in the first year after sowing was signficantly higher than from the permanent swards, at all fertilizer‐N treatments.”
Claim · model-written summary
The Lolium perenne reseed production advantage persisted in later years only at higher nitrogen rates.
- Taxon
- L. perenne
Lolium perennee0 - Outcome
- production advantagee0
- Qualifier
- only at the higher N ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In subsequent years the production advantage of the L. perenne reseeds was maintained only at the higher N rates”
Claim · model-written summary
Sown Lolium perenne and Trifolium repens was the most productive sward at zero nitrogen.
- Taxon
- L. perenneLolium perennee0
- Treatment
- 0 Ne0
- Outcome
- most productive sward typee0
- Direction
- most productivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sown L. perenne/T. repens was the most productive sward type at 0 N.”
Claim · model-written summary
Modified acid detergent fibre differences suggested a small quality advantage for reseeded swards.
Not reportedTaxon
Verbatim
e0“Average differences in modified acid‐detergent fibre suggested small advantages in herbage quality to the reseeded swards.”
Claim · model-written summary
The authors conclude reseeding to Lolium perenne cannot always be justified, especially with low or moderate nitrogen input.
- Taxon
- L. perenneLolium perennee0
- Outcome
- reseeding to a L. perenne sward cannot always be justifiede0
- Qualifier
- low or moderate inputs of fertilizer‐Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reseeding to a L. perenne sward cannot always be justified, particularly for grassland receiving low or moderate inputs of fertilizer‐N.”
The same questions in other papers
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
- no effect
- no effect
- 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
- positive
- 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.