Abstract
Abstract The effects of three levels of potash, phosphate and lime fertilizers on the yield and mineral content of white clover ( Trifolium repens ) and on soil nutrient levels were studied in a field experiment over 7 years. The aim of the experiment was to define an optimum fertilizer programme for breeding nurseries and experimental fields. Potash was the main factor limiting production: clover yield was negligible after 2 years where no potassium was applied. Phosphate increased yields after the third year, while liming had no significant effect on clover yield. The soil potassium status improved with the repeated application of potash over the 7–year period, but no consistent pattern was discernible for the phosphate treatments. There was a slight increase in soil pH with liming. Application of phosphate increased the phosphorous content of herbage, but had no effect on other plant constituents for the first 2 years. Subsequent applications increased the calcium and sodium contents. Potash reduced the content of all constituents other than potassium as the treatment levels increased. Lime had little effect on plant constituents other than calcium.
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Claims 11
Claim · model-written summary
Potash was the main factor limiting white clover yield; clover yield was negligible after 2 years without potassium.
- Taxon
- white clover
Trifolium repense0 - Treatment
- no potassium was appliede1
- Outcome
- clover yielde1
- Direction
- negligiblee1
- Qualifier
- after 2 yearse1
- Setting
- field experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three levels of potash, phosphate and lime fertilizers on the yield and mineral content of white clover ( Trifolium repens ) and on soil nutrient levels were studied in a field experiment over 7 years”
e1“Potash was the main factor limiting production: clover yield was negligible after 2 years where no potassium was applied”
Claim · model-written summary
Phosphate increased white clover yields after the third year.
- Taxon
- white cloverTrifolium repense0
- Treatment
- Phosphatee2
- Outcome
- yieldse2
- Direction
- increasede2
- Qualifier
- after the third yeare2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e2“Phosphate increased yields after the third year, while liming had no significant effect on clover yield”
Claim · model-written summary
Liming had no significant effect on white clover yield.
- Taxon
- white cloverTrifolium repense0
- Treatment
- liminge2
- Outcome
- clover yielde2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e2“while liming had no significant effect on clover yield”
Claim · model-written summary
Repeated potash application improved soil potassium status over the 7-year experiment.
- Taxon
- white cloverTrifolium repense0
- Treatment
- repeated application of potashe3
- Outcome
- soil potassium statuse3
- Direction
- improvede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e3“The soil potassium status improved with the repeated application of potash”
Claim · model-written summary
Phosphate treatments showed no consistent pattern in soil nutrient levels.
- Taxon
- white cloverTrifolium repense0
- Treatment
- phosphate treatmentse4
- Outcome
- soil nutrient levelse0
- Direction
- no_changeinferrede4
- Qualifier
- no consistent patterne4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three levels of potash, phosphate and lime fertilizers on the yield and mineral content of white clover ( Trifolium repens ) and on soil nutrient levels were studied in a field experiment over 7 years”
e4“no consistent pattern was discernible for the phosphate treatments”
Claim · model-written summary
Liming produced a slight increase in soil pH.
- Taxon
- white cloverTrifolium repense0
- Treatment
- liminge5
- Outcome
- soil pHe5
- Direction
- increasee5
- Qualifier
- slighte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e5“There was a slight increase in soil pH with liming”
Claim · model-written summary
Application of phosphate increased the phosphorus content of herbage.
- Taxon
- white cloverTrifolium repense0
- Treatment
- Application of phosphatee6
- Outcome
- phosphorous content of herbagee6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e6“Application of phosphate increased the phosphorous content of herbage, but had no effect on other plant constituents for the first 2 years”
Claim · model-written summary
Phosphate had no effect on other herbage constituents in the first 2 years.
- Taxon
- white cloverTrifolium repense0
- Treatment
- phosphatee6
- Outcome
- other plant constituentse6
- Direction
- no_changeinferrede6
- Qualifier
- for the first 2 yearse6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e6“Application of phosphate increased the phosphorous content of herbage, but had no effect on other plant constituents for the first 2 years”
Claim · model-written summary
Subsequent phosphate applications increased calcium and sodium contents of herbage.
- Taxon
- white cloverTrifolium repense0
- Treatment
- Subsequent applicationse7
- Outcome
- calcium and sodium contentse7
- Direction
- increasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e7“Subsequent applications increased the calcium and sodium contents”
Claim · model-written summary
Potash reduced the content of all herbage constituents other than potassium as treatment levels increased.
- Taxon
- white cloverTrifolium repense0
- Treatment
- Potashe1
- Outcome
- content of all constituents other than potassiume1
- Direction
- reducede1
- Qualifier
- as the treatment levels increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e1“Potash reduced the content of all constituents other than potassium as the treatment levels increased”
Claim · model-written summary
Lime had little effect on herbage constituents other than calcium.
- Taxon
- white cloverTrifolium repense0
- Treatment
- Limee1
- Outcome
- plant constituents other than calciume1
- Direction
- no_changeinferrede1
- Qualifier
- little effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clover ( Trifolium repens )”
e1“Lime had little effect on plant constituents other than calcium”
The same questions in other papers
lime · yield · Trifolium repens (white clover)Results differ
1 paper in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
10 papers more in this group
See all 14 papers →potassium · nutrient: content · Trifolium repens (white clover)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
potassium · yield · Trifolium repens (white clover)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
phosphorus · nutrient: content · Trifolium repens (white clover)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →lime · nutrient: content · Trifolium repens (white clover)Positive and negative results
10 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →phosphorus · yield · Trifolium repens (white clover)Positive and negative results
17 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- negative
19 papers more in this group
See all 23 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.