Abstract
SUMMARY In a 2-year experiment conducted on a pure S. 24 perennial ryegrass sward, fertilizer nitrogen in the form of ‘Nitram’ (34·5%) N was applied at rates of 100, 200 and 300 lb/ acre either as single dressings in the spring or as two, three, four or five split dressings at successively later dates in the growing season. Total yields of herbage dry matter and of crude protein, and their distribution over the season, were determined by cutting the herbage five times at intervals of approximately 5 weeks. Yields of herbage dry matter were increased by increasing the nitrogen application rate and by splitting the total amount of fertilizer nitrogen into either three or four equal dressings. The mean crudeprotein content of the herbage dry matter was increased by increasing the nitrogen application rate, but it was reduced by splitting the total amount of fertilizer into several dressings. The nitrate content of the herbage was higher after a single heavy dressing of fertilizer nitrogen than after several split dressings. It is concluded that the optimum application programme for a total rate of 100 lb nitrogen/acre was three split dressings each of 33J lb/acre, and for the 200 and 300 lb nitrogen/acre rate, four split dressings of 50 and 75 lb/acre respectively.
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
Herbage dry matter yield increased with a higher fertilizer nitrogen application rate.
- Taxon
- perennial ryegrass
Lolium perennee0 - Material
- S. 24e0
- Treatment
- nitrogen application ratee1
- Outcome
- Yields of herbage dry mattere1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e1“Yields of herbage dry matter were increased by increasing the nitrogen application rate and by splitting the total amount of fertilizer nitrogen into either three or four equal dressings”
Claim · model-written summary
Herbage dry matter yield increased when the nitrogen was split into three or four equal dressings.
- Taxon
- perennial ryegrassLolium perennee0
- Material
- S. 24e0
- Treatment
- splitting the total amount of fertilizer nitrogen into either three or four equal dressingse1
- Outcome
- Yields of herbage dry mattere1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e1“Yields of herbage dry matter were increased by increasing the nitrogen application rate and by splitting the total amount of fertilizer nitrogen into either three or four equal dressings”
Claim · model-written summary
Crude protein content of the herbage dry matter increased with a higher fertilizer nitrogen application rate.
- Taxon
- perennial ryegrassLolium perennee0
- Material
- S. 24e0
- Treatment
- nitrogen application ratee2
- Outcome
- crudeprotein content of the herbage dry mattere2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e2“The mean crudeprotein content of the herbage dry matter was increased by increasing the nitrogen application rate, but it was reduced by splitting the total amount of fertilizer into several dressings”
Claim · model-written summary
Crude protein content of the herbage dry matter was reduced by splitting the fertilizer nitrogen into several dressings.
- Taxon
- perennial ryegrassLolium perennee0
- Material
- S. 24e0
- Treatment
- splitting the total amount of fertilizer into several dressingse2
- Outcome
- crudeprotein content of the herbage dry mattere2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e2“The mean crudeprotein content of the herbage dry matter was increased by increasing the nitrogen application rate, but it was reduced by splitting the total amount of fertilizer into several dressings”
Claim · model-written summary
Herbage nitrate content was higher after a single heavy dressing of fertilizer nitrogen than after several split dressings.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- single heavy dressing of fertilizer nitrogene3
- Outcome
- nitrate content of the herbagee3
- Direction
- highere3
- Comparator
- several split dressingse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e3“The nitrate content of the herbage was higher after a single heavy dressing of fertilizer nitrogen than after several split dressings”
Claim · model-written summary
For a total of 100 lb nitrogen/acre, three split dressings were the optimum application programme.
- Taxon
- perennial ryegrassLolium perennee0
- Treatment
- three split dressingse4
- Outcome
- optimum application programmee4
- Value
- 100 lb nitrogen/acree4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conducted on a pure S. 24 perennial ryegrass sward”
e4“the optimum application programme for a total rate of 100 lb nitrogen/acre was three split dressings each of 33J lb/acre”
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 →nitrogen · yield · Lolium perenne (perennial ryegrass)Results differ
43 papers in the same direction as this paper · 12 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
- negative
55 papers more in this group
See all 59 papers →fertilization · growth · Lolium perenne (perennial ryegrass)Positive and negative results
6 papers in the same direction as this paper · 28 in the opposite direction
- positive
- positive
- positive
31 papers more in this group
See all 35 papers →fertilization · yield · Lolium perenne (perennial ryegrass)Positive and negative results
25 papers in the same direction as this paper · 9 in the opposite direction · 5 reporting no difference from an alternative
- negative
- no effect
- no effect
36 papers more in this group
See all 40 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.