Abstract
Red clover (Trifolium pratense L.) is one of the most important plants in forage production, especially in northern areas. Fertilisation practices are focused on high yield and forage quality but effects of nutrients on nodulation and N2 fixation are poorly understood. The aim of this work was to study how nitrogen (N) and phosphorus (P) separately as well as in combination affected nodulation. Red clover plants were grown in pots with gravel in a greenhouse for 11 weeks. To resemble field conditions the root temperature was kept lower than the shoot temperature. Plants were given five different combinations of N and P concentrations during growth. The result showed that at high N concentrations P had a counteracting effect on the N inhibition. The N2-fixation parameters, nodule number, nodule dry matter and specific nitrogenase activity, were six times higher in plants grown with high N and high P than in plants with high N and low P. When the N2-fixation parameters and the dry matter of roots and shoots were related to total plant dry matter, there was a stronger effect of P on nodulation parameters than on roots and shoots. This indicates that P has a direct effect on the N2-fixation parameters, rather than an indirect effect via increased plant growth. These results demonstrate the importance to studying the effects of more than one nutrient at a time. Keywords: N2-FIXATIONNitrogenPhosphorusRed Clover
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Claims 4
Claim · model-written summary
At high nitrogen, phosphorus counteracted nitrogen inhibition of red clover nodulation.
- Taxon
- Red Clover
Trifolium pratenset0 - Treatment
- Pe0
- Outcome
- N inhibitione0
- Direction
- counteracting effecte0
- Qualifier
- high N concentrationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at high N concentrations P had a counteracting effect on the N inhibition”
t0“Red Clover”
Claim · model-written summary
Nodule number, nodule dry matter and nitrogenase activity were six times higher under high N and high P than high N and low P.
- Taxon
- Red CloverTrifolium pratenset0
- Treatment
- high N and high Pe0
- Outcome
- nodule number, nodule dry matter and specific nitrogenase activitye0
- Direction
- highere0
- Value
- six timese0
- Comparator
- high N and low Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nodule number, nodule dry matter and specific nitrogenase activity, were six times higher in plants grown with high N and high P than in plants with high N and low P.”
t0“Red Clover”
Claim · model-written summary
Phosphorus affected nodulation parameters more strongly than root and shoot dry matter relative to plant dry matter.
- Taxon
- Red CloverTrifolium pratenset0
- Treatment
- Pe0
- Outcome
- nodulation parameterse0
- Direction
- strongere0
- Comparator
- roots and shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a stronger effect of P on nodulation parameters than on roots and shoots”
t0“Red Clover”
Claim · model-written summary
The authors infer a direct phosphorus effect on nitrogen fixation parameters rather than an effect mediated by plant growth.
- Taxon
- Red CloverTrifolium pratenset0
- Treatment
- Pe0
- Outcome
- N2-fixation parameterse0
- Qualifier
- rather than an indirect effect via increased plant growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P has a direct effect on the N2-fixation parameters, rather than an indirect effect via increased plant growth”
t0“Red Clover”
The same questions in other papers
phosphorus · disease · Trifolium pratense (red clover)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.