Abstract
Summary All combinations of four levels of potassium and two of nitrogen were applied in each of 2 years to a hill sward on a brown podzolic soil with an 8 cm peaty surface horizon anda very low level of extractable K. The sward had been surface-sown 11 years before with white clover ( Trifolium repens L.) and perennial ryegrass ( Lolium perenne L.). During the course of the experiment, harvesting was by cutting, with an average interval between cuts of 5 weeks. The previous management had been sheep grazing. The proportion of clover in harvested herbage was increased by applied K and reduced by applied N. The clover grew strongly in the 1st year of cutting management where K, but no N, was applied, but there was much less clover in the 2nd year on all plots. The concentration of K in both clover and grass was greatly increased by applied K, but only the clover responded strongly in terms of extra herbage produced. This suggests that grass growth was N-limited, whereas the clover had sufficient N from symbiotic fixation. Applied K increased the size and weight of clover leaves, the rate of extension of the stolon main axis, and the number and length of stolon branches, but did not affect the rate of emergence of leaves on the stolon main axis. Applied N had a generally negative effect on the aspects of clover growth and morphology which were measured. The length and weight per ryegrass leaf blade were generally slightly increased by both applied K and applied N.
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Claims 10
Claim · model-written summary
Potassium increased clover proportion in harvested herbage.
- Taxon
- white clover
Trifolium repenst0 - Treatment
- applied Ke0
- Outcome
- proportion of clover in harvested herbagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of clover in harvested herbage was increased by applied K and reduced by applied N.”
t0“white clover”
Claim · model-written summary
Nitrogen reduced clover proportion in harvested herbage.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- applied Ne0
- Outcome
- proportion of clover in harvested herbagee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of clover in harvested herbage was increased by applied K and reduced by applied N.”
t0“white clover”
Claim · model-written summary
Clover grew strongly with potassium and no nitrogen in the first year, then was much less abundant in year two.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- clover grewe0
- Direction
- much lesse0
- Qualifier
- 2nd year on all plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The clover grew strongly in the 1st year of cutting management where K, but no N, was applied, but there was much less clover in the 2nd year on all plots.”
t0“white clover”
Claim · model-written summary
Potassium greatly increased K concentration in clover and grass.
Not reportedComparator
Verbatim
e0“The concentration of K in both clover and grass was greatly increased by applied K”
Claim · model-written summary
Only clover responded strongly to potassium with extra herbage.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- extra herbage producede0
- Direction
- extrae0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the clover responded strongly in terms of extra herbage produced.”
t0“white clover”
Claim · model-written summary
Potassium increased clover leaf size and weight and stolon extension and branching.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- Applied Ke0
- Outcome
- size and weight of clover leaves, the rate of extension of the stolon main axis, and the number and length of stolon branchese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applied K increased the size and weight of clover leaves, the rate of extension of the stolon main axis, and the number and length of stolon branches”
t0“white clover”
Claim · model-written summary
Potassium did not affect clover leaf emergence rate.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- rate of emergence of leaves on the stolon main axise0
- Direction
- did not affecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not affect the rate of emergence of leaves on the stolon main axis.”
t0“white clover”
Claim · model-written summary
Applied nitrogen generally reduced measured clover growth and morphology.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- Applied Ne0
- Outcome
- clover growth and morphologye0
- Direction
- negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applied N had a generally negative effect on the aspects of clover growth and morphology which were measured.”
t0“white clover”
Claim · model-written summary
Applied potassium slightly increased ryegrass leaf blade length and weight.
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and weight per ryegrass leaf blade were generally slightly increased by both applied K and applied N.”
Claim · model-written summary
Applied nitrogen slightly increased ryegrass leaf blade length and weight.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and weight per ryegrass leaf blade were generally slightly increased by both applied K and applied N.”
The same questions in other papers
nitrogen · growth · Trifolium repens (white clover)Results differ
14 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
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See all 28 papers →potassium · growth · Trifolium repens (white clover)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
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See all 6 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.