Abstract
Abstract Two methods of placement of 32 P in soil were used to investigate the root activity in perennial ryegrass and mixed ryegrass–white clover swards. The placement of isotope by either horizontal or vertical insertion in the mixed sward had no significant effect on the distribution of root activity with depth, the total dry‐matter yield of herbage or its distribution between ryegrass and clover. At least 90% of the root activity to a depth of 35 cm for both grass and clover occurred within the upper 12.5 cm of the soil profile. Irrigation resulted in a more even distribution of root activity with depth and increased the lateral exploitation of soil P. In the irrigated plot, the root activity of both grass and clover above the line of isotope placement accounted for 40–50% of the total activity at depths to 18.8 cm in contrast to 70–100% in the absence of irrigation. The method of defoliation (cutting versus grazing) had no significant effect on the vertical or lateral distribution of root activity. In unirrigated mixed swards, the root activity of grass in the upper 12.5 cm of the soil profile was greater by a factor of 1.5 to 2 than the contribution of grass to the yield of herbage. With irrigation, however, the distribution of root activity between grass and clover was similar to the contribution of each to the yield of herbage.
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Claims 8
Claim · model-written summary
Horizontal and vertical isotope placement did not differ in root activity depth distribution, herbage yield, or ryegrass–clover yield distribution.
- Taxon
- perennial ryegrass and white clover
Trifolium repens
Lolium perennet0 - Treatment
- horizontal or vertical insertione0
- Outcome
- distribution of root activity with depth, the total dry‐matter yield of herbage or its distribution between ryegrass and clovere0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“The placement of isotope by either horizontal or vertical insertion in the mixed sward had no significant effect on the distribution of root activity with depth, the total dry‐matter yield of herbage or its distribution between ryegrass and clover”
Claim · model-written summary
At least 90% of grass and clover root activity to 35 cm occurred within the top 12.5 cm.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Outcome
- root activitye0
- Value
- At least 90%e0
- Qualifier
- upper 12.5 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“At least 90% of the root activity to a depth of 35 cm for both grass and clover occurred within the upper 12.5 cm of the soil profile”
Claim · model-written summary
Irrigation made root activity distribution more even with depth.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Treatment
- Irrigatione0
- Outcome
- distribution of root activity with depthe0
- Direction
- more evene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“Irrigation resulted in a more even distribution of root activity with depth and increased the lateral exploitation of soil P”
Claim · model-written summary
Irrigation increased lateral exploitation of soil phosphorus.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Treatment
- Irrigatione0
- Outcome
- lateral exploitation of soil Pe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“Irrigation resulted in a more even distribution of root activity with depth and increased the lateral exploitation of soil P”
Claim · model-written summary
Root activity above the isotope placement line was 40–50% with irrigation, versus 70–100% without it.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Treatment
- irrigated plote0
- Outcome
- root activity of both grass and clover above the line of isotope placemente0
- Direction
- lowerinferrede0
- Value
- 40–50%e0
- Qualifier
- 70–100%e0
- Comparator
- absence of irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“In the irrigated plot, the root activity of both grass and clover above the line of isotope placement accounted for 40–50% of the total activity at depths to 18.8 cm in contrast to 70–100% in the absence of irrigation”
Claim · model-written summary
Cutting and grazing did not differ in vertical or lateral root activity distribution.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Treatment
- cuttinge0
- Outcome
- vertical or lateral distribution of root activitye0
- Direction
- no significant effecte0
- Comparator
- grazinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“The method of defoliation (cutting versus grazing) had no significant effect on the vertical or lateral distribution of root activity”
Claim · model-written summary
In unirrigated mixed swards, grass root activity in the upper 12.5 cm exceeded its herbage yield contribution by 1.5 to 2 times.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Outcome
- root activity of grasse0
- Direction
- greatere0
- Value
- a factor of 1.5 to 2e0
- Qualifier
- upper 12.5 cme0
- Comparator
- contribution of grass to the yield of herbagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“In unirrigated mixed swards, the root activity of grass in the upper 12.5 cm of the soil profile was greater by a factor of 1.5 to 2 than the contribution of grass to the yield of herbage”
Claim · model-written summary
With irrigation, grass and clover root activity distribution resembled each species’ contribution to herbage yield.
- Taxon
- perennial ryegrass and white cloverTrifolium repensLolium perennet0
- Treatment
- irrigatione0
- Outcome
- distribution of root activity between grass and clovere0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“perennial ryegrass and white clover”
e0“With irrigation, however, the distribution of root activity between grass and clover was similar to the contribution of each to the yield of herbage”
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16 papers in the same direction as this paper · 15 reporting no difference from an alternative
- positive
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See all 32 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.