Abstract
Breeze, V. G. and Hopper, M. J. 1987. The uptake of phosphate by plants from flowing nutrient solution. IV. Effect of phosphate concentration on the growth of Trifolium repens L. supplied with nitrate, or dependent upon symbiotically fixed nitrogen.—J. exp. Bot. 38: 618–630. Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture (0.32 to 8.0 mmol m−3 P) at 41 d from sowing, either supplied with nitrate or dependent on symbiotically-fixed nitrogen. No effect of phosphate concentration in solution on dry matter production, relative growth rate, root/shoot ratio, or water soluble carbohydrate concentration of the plant tissue was observed after 24 d from the start of the experiment, although the plants supplied with nitrate yielded more than the others. Phosphate uptake throughout the experimental period was related to the solution concentration, but the source of nitrogen did not affect the phosphorus concentrations of the shoots. However, the roots of the plants dependent on symbiotically-fixed nitrogen had higher concentrations of phosphorus than those supplied with nitrate, but this did not appear to be due to an increased phosphorus requirement for nitrogen fixation, because the amount fixed was unaffected by the phosphate concentration in solution. The cation-anion balance showed that plants dependent on nitrogen fixation had no larger requirement for calcium than plants supplied with nitrate, but a requirement for hydroxyl ions equivalent to over 130 kg lime per tonne of dry shoot. It is suggested that the enhanced phosphate uptake by plants dependent on nitrogen fixation is due to this need for a cation-charge balancing anion.
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Claims 10
Claim · model-written summary
Phosphate concentration in solution had no effect on dry matter production or relative growth rate of white clover after 24 d
- Taxon
- white clover
Trifolium repense0 - Treatment
- phosphate concentration in solutione1
- Outcome
- dry matter production, relative growth ratee1
- Direction
- No effecte1
- Setting
- flowing solution culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e1“No effect of phosphate concentration in solution on dry matter production, relative growth rate, root/shoot ratio, or water soluble carbohydrate concentration of the plant tissue was observed after 24 d”
Claim · model-written summary
Phosphate concentration in solution had no effect on root/shoot ratio or water soluble carbohydrate concentration of white clover after 24 d
- Taxon
- white cloverTrifolium repense0
- Treatment
- phosphate concentration in solutione1
- Outcome
- root/shoot ratio, or water soluble carbohydrate concentratione1
- Direction
- No effecte1
- Setting
- flowing solution culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e1“No effect of phosphate concentration in solution on dry matter production, relative growth rate, root/shoot ratio, or water soluble carbohydrate concentration of the plant tissue was observed after 24 d”
Claim · model-written summary
White clover supplied with nitrate yielded more than plants dependent on symbiotic nitrogen fixation
- Taxon
- white cloverTrifolium repense0
- Treatment
- supplied with nitratee2
- Outcome
- yieldede2
- Direction
- moree2
- Comparator
- the otherse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e2“although the plants supplied with nitrate yielded more than the others”
Claim · model-written summary
Phosphate uptake by white clover was related to phosphate concentration in solution
- Taxon
- white cloverTrifolium repense0
- Treatment
- solution concentratione3
- Outcome
- Phosphate uptakee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e3“Phosphate uptake throughout the experimental period was related to the solution concentration”
Claim · model-written summary
Source of nitrogen did not affect phosphorus concentrations in white clover shoots
- Taxon
- white cloverTrifolium repense0
- Organ / stage
- shootse4
- Treatment
- source of nitrogene4
- Outcome
- phosphorus concentrationse4
- Direction
- did not affecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e4“the source of nitrogen did not affect the phosphorus concentrations of the shoots”
Claim · model-written summary
Roots of white clover dependent on symbiotically fixed nitrogen had higher phosphorus concentrations than roots of plants supplied with nitrate
- Taxon
- white cloverTrifolium repense0
- Organ / stage
- rootse5
- Treatment
- dependent on symbiotically-fixed nitrogene5
- Outcome
- concentrations of phosphoruse5
- Direction
- highere5
- Comparator
- those supplied with nitratee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e5“the roots of the plants dependent on symbiotically-fixed nitrogen had higher concentrations of phosphorus than those supplied with nitrate”
Claim · model-written summary
Amount of nitrogen fixed by white clover was unaffected by phosphate concentration in solution
- Taxon
- white cloverTrifolium repense0
- Treatment
- phosphate concentration in solutione6
- Outcome
- amount fixede6
- Direction
- unaffectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e6“the amount fixed was unaffected by the phosphate concentration in solution”
Claim · model-written summary
Plants dependent on nitrogen fixation had no larger calcium requirement than plants supplied with nitrate
- Taxon
- white cloverTrifolium repense0
- Treatment
- dependent on nitrogen fixatione7
- Outcome
- requirement for calciume7
- Direction
- no largere7
- Comparator
- plants supplied with nitratee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e7“plants dependent on nitrogen fixation had no larger requirement for calcium than plants supplied with nitrate”
Claim · model-written summary
Plants dependent on nitrogen fixation required hydroxyl ions equivalent to over 130 kg lime per tonne of dry shoot
- Taxon
- white cloverTrifolium repense0
- Outcome
- requirement for hydroxyl ionse1
- Value
- over 130 kg lime per tonne of dry shoote1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e1“a requirement for hydroxyl ions equivalent to over 130 kg lime per tonne of dry shoot”
Claim · model-written summary
Enhanced phosphate uptake by plants dependent on nitrogen fixation is suggested to result from a need for a cation-charge balancing anion
- Taxon
- white cloverTrifolium repense0
- Treatment
- dependent on nitrogen fixatione1
- Outcome
- enhanced phosphate uptakee1
- Qualifier
- need for a cation-charge balancing anione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodulated white clover plants were subjected to a range of phosphate concentrations in flowing solution culture”
e1“It is suggested that the enhanced phosphate uptake by plants dependent on nitrogen fixation is due to this need for a cation-charge balancing anion”
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
- negative
- negative
20 papers more in this group
See all 24 papers →nitrogen · nutrient: content · Trifolium repens (white clover)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
phosphorus · yield · Trifolium repens (white clover)Positive and negative results
4 papers in the same direction as this paper · 18 in the opposite direction
- positive
- positive
- positive
19 papers more in this group
See all 23 papers →phosphorus · quality: sugar starch · Trifolium repens (white clover)Results agree
1 paper in the same direction as this paper
- no effect
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.