nitrogen · Yield · Trifolium repens (white clover)

Results differ24 papers: 11 positive, 13 negative or no effect · 1 pair of papers confirmed to differ

28 claims from these papers; 7 citations between them.

Papers whose results differ, checked claim by claim 1

1 pair of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.

The effect of low soil temperature and fertiliser N rate on perennial ryegrass(Lolium perenne)and white clover(Trifolium repens)grown under controlled conditions (2008)
no changeTested nitrogen treatments caused no significant reduction in clover dry matter production.
Effect of Spring Applied Urea and Calcium Ammonium Nitrate on White Clover (Trifolium repens) Performance in a Grazed Ryegrass-Clover Pasture (2016)
decreaseUrea reduced total clover production to 1.52 t/ha compared with 2.00 t/ha in the control.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →

How these papers cite each other

7 citations between these papers: 6 on the same side, 1 across the two sides.

Positive result
Negative result or no effect
Citation, pointing to the cited paper
Citation across the two sides
Larger circle: more citations overall

Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.

Papers reporting a positive result 11

SOME EFFECTS OF GANGMOWING AND NITROGENOUS FERTILIZER ON A RYEGRASS/WHITE‐CLOVER LEY · 1960
- positive
  Ungrazed gangmown swards had higher herbage production than grazed swards at little or no nitrogen.
  compared with grazed swards receiving little or no fertilizer nitrogen
- no effect
  Herbage production was almost identical at high nitrogen application rates.
  compared with grazed swardsNo difference from an alternative treatment
THE INFLUENCE OF VARIOUS FORMS OF NITROGENOUS FERTILIZER ON THE GROWTH OF A PERENNIAL RYEGRASS / WHITE CLOVER SWARD IN EARLY SPRING · 1966
- positive
  Ammonium nitrate, ammonium sulphate and urea produced similar yield increases in the sward.
The Uptake of Phosphate by Plants from Flowing Nutrient Solution · 1987
- positive
  White clover supplied with nitrate yielded more than plants dependent on symbiotic nitrogen fixation
  compared with the others
Response of white clover cultivars to fertiliser nitrogen · 1993
cites 1 paper herecited by 1 paper here
Productivity of white clover cultivars under intensive grazing, as affected by high nitrogen fertiliser application · 1995
- positive
  Fertiliser N application increased total annual pasture production by 25–31%.
- negative
  N application reduced white clover production by 8, 17, and 30% in Years 1, 2, and 3 respectively.
cites 1 paper here
Green Manuring with Clover and Ryegrass Catch Crops Undersown in Small Grains: Crop Development and Yields · 1996
- positive
  White clover plus 60 kg N ha−1 yielded more grain than 120 kg N ha−1 mineral fertilizer alone.
  compared with 120 kg N ha−1 as mineral fertilizer only
Influence of the timing and duration of pastoral fallowing and nitrogen fertiliser on pasture and white clover ( Trifolium repens ) growth in hill country · 1998
- positive
  Nitrogen enhanced the decline in grass tiller density during March to June fallow.
Fertilization with nitrogen and potassium on pastures in temperate areas · 2004
- positive
  Potassium and nitrogen application increased herbage production of the white clover-perennial ryegrass sward.
Evaluation of Dandelion as a Potential Forage Species in Mixed‐Species Swards · 2009
- positive
  Nitrogen reduced nonsown species yield except in the white clover–dandelion mixture.
Effect of P,N and K Combined Fertilization on the Growth and Nutrients of Trifolium repens L. · 2014
- positive
  At equal P level, combined N, P and K produced more aboveground biomass than P alone.
  compared with single P
SUSTAINABILITY OF WHITE CLOVER (TRIFOLIUM REPENS L.) IN SOWN SWARDS DEPENDING ON THEIR COMPOSITION, INTENSITY MOWING AND NITROGEN FERTILIZERS · 2021
- positive
  N180 nitrogen increased grass-legume herbage yield by 31%.

Papers reporting a negative result or no effect 13

Effect of Gibberellic Acid and Nitrogen On Winter Growth of Pasture · 1959
- no effect
  Fertiliser nitrogen production equalled that from gibberellic acid six weeks after application.
  compared with gibberellic acidNo difference from an alternative treatment
The relative performance of white clover genotypes with rhizobial and mineral nitrogen in agar culture and in soil · 1976
- no effect
  In agar culture, yield did not differ between rhizobial and inorganic nitrogen sources.
The effects of nitrogen fertilizer applied in spring on swards of ryegrass sown with four cultivars of white clover · 1980
- negative
  Nitrogen application reduced annual white clover yield by similar amounts irrespective of cultivar.
cited by 3 papers here
The effect of strategic nitrogen application and defoliation systems on the productivity of a perennial ryegrass/white clover sward · 1987
- no effect
  Spring N application did not greatly reduce white clover production in this experiment.
cites 1 paper herecited by 1 paper here
The effect of nitrogen in cattle slurry and mineral fertilizers on nitrogen fixation by white clover · 1990
- negative
  Applying 75 kg mineral N ha −1 decreased fixed nitrogen yield to 17·2 kg ha −1.
Effect of interval between harvests and spring‐applied fertilizer N on the growth of white clover in a mixed sward · 1995
- negative
  Combined spring N application and a six-week cutting interval were harmful to white clover production.
cites 1 paper here
Evaluating Nitrogen Management Options for Reducing Nitrate Leaching from Northeast U.S. Pastures · 2001
- negative
  Using white clover to supply nitrogen to the pasture produced less dry matter yield.
Sexual reproduction of Lolium perenne L. and Trifolium repens L. under free air CO₂ enrichment (FACE) at two levels of nitrogen application · 2001
- negative
  Seed-eating weevils lowered the seed output per pod of fumigated Trifolium repens at high N.
The effect of fertiliser N rates on growth of perennial ryegrass (Lolium perenne) and white clover (Trifolium repens) grown at high soil water levels under controlled conditions · 2006
- no effect
  White clover primary dry matter production did not respond to nitrogen rate or soil water potential.
cited by 1 paper here
The effect of low soil temperature and fertiliser N rate on perennial ryegrass(Lolium perenne)and white clover(Trifolium repens)grown under controlled conditions · 2008
- no effect
  Tested nitrogen treatments caused no significant reduction in clover dry matter production.
cites 1 paper here
Herbage and nitrogen yields, fixation and transfer by white clover to companion grasses in grazed swards under different rates of nitrogen fertilization · 2015
- negative
  Fertilizer N application reduced the percentage and yield of fixed N.
cited by 1 paper here
Effect of Spring Applied Urea and Calcium Ammonium Nitrate on White Clover (Trifolium repens) Performance in a Grazed Ryegrass-Clover Pasture · 2016
- negative
  Urea reduced total clover production to 1.52 t/ha compared with 2.00 t/ha in the control.
  compared with the control
Incorporating white clover (Trifolium repens L.) into perennial ryegrass (Lolium perenne L.) swards receiving varying levels of nitrogen fertilizer: Effects on milk and herbage production · 2018
- no effect
  Reducing nitrogen to 150 kg N/ha on grass-clover swards did not reduce herbage production versus grass-only swards at 250 kg N/ha.
  compared with grass-only swards receiving 250 kg of N/haNo difference from an alternative treatment
cites 2 papers here

A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.

nitrogen · Yield · Trifolium repens (white clover)

Papers whose results differ, checked claim by claim 1

How these papers cite each other

Papers reporting a positive result 11

Papers reporting a negative result or no effect 13

nitrogen on Trifolium repens (white clover) against other targets

nitrogen · yield on other organisms