Abstract
Abstract Fifteen white clover ( Trifolium repens L.) cultivars were grown with perennial ryegrass to determine their tolerance to fertiliser nitrogen (N) application. There were four N treatments (0, 25, 100, and 225 kg N/ha per year) and the trial was mob‐stocked by sheep 8 times a year for 3 years. N applied at 25 kg N/ha per year had no significant effect on either clover or total sward yield. However, 225 kg N/ha per year depressed clover yield by 38% and clover proportion in the sward by 45% but increased total sward yield by 27%. There was no significant cultivar × N interaction for clover yield or proportion of clover in the sward. However, there was a significant difference among cultivars for N tolerance ratio in spring, calculated as N 225 divided by the mean of N 0 and N 25 of clover yield. Cultivars with the highest N tolerance ratio were Huia, Kopu, Bianca, and Crau; those with the lowest were Menna, Aran, Katrina, and N‐line. Spring N tolerance ratio was not correlated with spring yield or any of the stolon characters measured. There were no significant cultivar × N interactions for stolon characters measured, including stolon length per unit area, stolon dry weight per unit area, and stolon growing point density. Similarly, there were no significant differences among cultivars for N tolerance ratio for any of the stolon characters measured. Total sward yield was significantly related to clover yield when N was applied at 25 kg N/ha per year. There were large differences among cultivars for clover yield, total sward yield, and proportion of clover in the sward. Cultivars with highest clover yields were Crau, G.23, Demand, Olwen, and Aran; lowest clover yields were from Menna, N‐line, Kersey, Katrina, and Tahora. Total yields of swards containing Crau were significantly higher than that of most other cultivars. There was a significant cultivar × season interaction for clover yield and proportion of clover in the sward. G.23 had the highest proportion of clover in the cool autumn‐winter period whereas Crau was highest in the warmer summer‐autumn period. High summer clover contents were obtained for Aran, Olwen, and Demand, and high winter clover contents for Kopu.
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Claims 20
Claim · model-written summary
Applying 225 kg N/ha per year depressed white clover yield by 38%.
- Taxon
- white clover
Trifolium repenst0 - Treatment
- 225 kg N/ha per yeare0
- Outcome
- clover yielde0
- Direction
- depressede0
- Value
- 38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“225 kg N/ha per year depressed clover yield by 38% and clover proportion in the sward by 45% but increased total sward yield by 27%”
Claim · model-written summary
Applying 225 kg N/ha per year depressed clover proportion in the sward by 45%.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- 225 kg N/ha per yeare0
- Outcome
- clover proportion in the swarde0
- Direction
- depressede0
- Value
- 45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“225 kg N/ha per year depressed clover yield by 38% and clover proportion in the sward by 45% but increased total sward yield by 27%”
Claim · model-written summary
Applying 225 kg N/ha per year increased total sward yield by 27%.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- 225 kg N/ha per yeare0
- Outcome
- total sward yielde0
- Direction
- increasede0
- Value
- 27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“225 kg N/ha per year depressed clover yield by 38% and clover proportion in the sward by 45% but increased total sward yield by 27%”
Claim · model-written summary
Applying 25 kg N/ha per year had no significant effect on clover or total sward yield.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- 25 kg N/ha per yeare0
- Outcome
- clover or total sward yielde0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“N applied at 25 kg N/ha per year had no significant effect on either clover or total sward yield”
Claim · model-written summary
Huia, Kopu, Bianca and Crau had the highest spring N tolerance ratio among white clover cultivars.
- Taxon
- white cloverTrifolium repenst0
- Material
- Huia, Kopu, Bianca, and Craue0
- Outcome
- N tolerance ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Cultivars with the highest N tolerance ratio were Huia, Kopu, Bianca, and Crau; those with the lowest were Menna, Aran, Katrina”
Claim · model-written summary
Menna, Aran and Katrina had the lowest spring N tolerance ratio among white clover cultivars.
- Taxon
- white cloverTrifolium repenst0
- Material
- Menna, Aran, Katrinae0
- Outcome
- N tolerance ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Cultivars with the highest N tolerance ratio were Huia, Kopu, Bianca, and Crau; those with the lowest were Menna, Aran, Katrina”
Claim · model-written summary
Spring N tolerance ratio is not correlated with spring yield or the stolon characters measured.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- spring yield or any of the stolon characters measurede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Spring N tolerance ratio was not correlated with spring yield or any of the stolon characters measured”
Claim · model-written summary
Total sward yield was significantly related to clover yield when 25 kg N/ha per year was applied.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- 25 kg N/ha per yeare0
- Outcome
- Total sward yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Total sward yield was significantly related to clover yield when N was applied at 25 kg N/ha per year”
Claim · model-written summary
No significant cultivar by N interaction was found for clover yield or proportion of clover in the sward.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- clover yield or proportion of clover in the swarde0
- Qualifier
- cultivar × N interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“There was no significant cultivar × N interaction for clover yield or proportion of clover in the sward”
Claim · model-written summary
No significant cultivar by N interaction was found for stolon characters.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- stolon characters measurede0
- Qualifier
- stolon length per unit area, stolon dry weight per unit area, and stolon growing point densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“There were no significant cultivar × N interactions for stolon characters measured, including stolon length per unit area, stolon dry weight per unit area, and stolon growing point density”
Claim · model-written summary
Large differences exist among white clover cultivars for clover yield, total sward yield and proportion of clover in the sward.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- clover yield, total sward yield, and proportion of clover in the swarde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“There were large differences among cultivars for clover yield, total sward yield, and proportion of clover in the sward”
Claim · model-written summary
Crau, G.23, Demand, Olwen and Aran had the highest clover yields among white clover cultivars.
- Taxon
- white cloverTrifolium repenst0
- Material
- Crau, G.23, Demand, Olwen, and Arane0
- Outcome
- clover yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Cultivars with highest clover yields were Crau, G.23, Demand, Olwen, and Aran”
Claim · model-written summary
Menna, N-line, Kersey, Katrina and Tahora had the lowest clover yields among white clover cultivars.
- Taxon
- white cloverTrifolium repenst0
- Material
- Kersey, Katrina, and Tahorae0
- Outcome
- clover yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“lowest clover yields were from Menna, N‐line, Kersey, Katrina, and Tahora”
Claim · model-written summary
Swards containing Crau had significantly higher total yields than most other cultivars.
- Taxon
- white cloverTrifolium repenst0
- Material
- Craue0
- Outcome
- Total yields of swardse0
- Direction
- highere0
- Comparator
- most other cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Total yields of swards containing Crau were significantly higher than that of most other cultivars”
Claim · model-written summary
A significant cultivar by season interaction was found for clover yield and proportion of clover in the sward.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- clover yield and proportion of clover in the swarde0
- Qualifier
- cultivar × season interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“There was a significant cultivar × season interaction for clover yield and proportion of clover in the sward”
Claim · model-written summary
G.23 had the highest proportion of clover in the cool autumn-winter period.
- Taxon
- white cloverTrifolium repenst0
- Material
- G.23e0
- Outcome
- proportion of clovere0
- Setting
- cool autumn‑winter periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“G.23 had the highest proportion of clover in the cool autumn‑winter period whereas Crau was highest in the warmer summer‑autumn period”
Claim · model-written summary
Crau was highest in proportion of clover in the warmer summer-autumn period.
- Taxon
- white cloverTrifolium repenst0
- Material
- Craue0
- Outcome
- proportion of clovere0
- Setting
- warmer summer‑autumn periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“G.23 had the highest proportion of clover in the cool autumn‑winter period whereas Crau was highest in the warmer summer‑autumn period”
Claim · model-written summary
Aran, Olwen and Demand had high summer clover contents.
- Taxon
- white cloverTrifolium repenst0
- Material
- Aran, Olwen, and Demande0
- Outcome
- High summer clover contentse0
- Setting
- summere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“High summer clover contents were obtained for Aran, Olwen, and Demand, and high winter clover contents for Kopu”
Claim · model-written summary
Kopu had high winter clover contents.
- Taxon
- white cloverTrifolium repenst0
- Material
- Kopue0
- Outcome
- high winter clover contentse0
- Setting
- wintere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“High summer clover contents were obtained for Aran, Olwen, and Demand, and high winter clover contents for Kopu”
Claim · model-written summary
No significant differences among cultivars were found for N tolerance ratio for any stolon characters.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- N tolerance ratio for any of the stolon characters measurede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“white clover cultivars”
e0“Similarly, there were no significant differences among cultivars for N tolerance ratio for any of the stolon characters measured”
The same questions in other papers
nitrogen · yield · Trifolium repens (white clover)Results differ
10 papers in the same direction as this paper · 11 in the opposite direction · 2 reporting no difference from an alternative
- negative
- positive
- negative
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.