Abstract
ln an experiment with lucerne (Medicago sativa) and subterranean clover (Trifolium subterraneum), grown in solution cultures at two levels of phosphorus, each at five aluminium levels and pH 4, growth and aluminium transport to the leaves were comparable in both species up to the fourth aluminium level (40¦M All. The highest aluminium level (200 ¦M Al) caused a much greater growth depression in lucerne than in subterranean clover. In lucerne, aluminium concentrations in leaf dry matter peaked at the fourth aluminium level. Concentrations below this peak could indicate non-toxic as well as toxic supplies of aluminium. Leaf analysis, therefore, appears to be of little value in the detection of aluminium problems in lucerne. In subterranean clover leaves, aluminium concentrations increased to values in excess of 1 70 ppm of the dry matter at the highest aluminium level. In a second experiment, in which subterranean clover plants were grown in pots in two acid soils at two phosphorus x five aluminium levels, close, inverse, linear relations were found between relative yield (Al/no Al x 100) and leaf aluminium concentrations. These relations differed between soils, harvests and phosphorus levels, and would therefore be of little help in providing quantitative estimates of yield depressions in subterranean clover caused by aluminium. However, the lines all converged within the range of 100-1 50 ppm aluminium in leaf dry matter of plants in the no aluminium treatment, suggesting that this range represented a 'threshold' above which yield reductions due to aluminium occurred.
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Claims 12
Claim · model-written summary
Lucerne and subterranean clover had comparable growth through the fourth aluminum level.
Verbatim
e0“growth and aluminium transport to the leaves were comparable in both species up to the fourth aluminium level (40¦M All”
Claim · model-written summary
Lucerne and subterranean clover had comparable leaf aluminum transport through the fourth aluminum level.
Verbatim
e0“growth and aluminium transport to the leaves were comparable in both species up to the fourth aluminium level (40¦M All”
Claim · model-written summary
The highest aluminum level depressed lucerne growth more than subterranean clover growth.
- Taxon
- lucerne
Medicago sativae0 - Treatment
- 200 ¦M Ale0
- Outcome
- growth depressione0
- Direction
- greatere0
- Comparator
- subterranean clovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest aluminium level (200 ¦M Al) caused a much greater growth depression in lucerne than in subterranean clover”
Claim · model-written summary
Lucerne leaf aluminum concentration peaked at the fourth aluminum level.
- Taxon
- lucerneMedicago sativae0
- Organ / stage
- leafe0
- Outcome
- aluminium concentrationse0
- Direction
- peakede0
- Qualifier
- fourth aluminium levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In lucerne, aluminium concentrations in leaf dry matter peaked at the fourth aluminium level”
Claim · model-written summary
Lucerne leaf aluminum concentrations below the peak occurred with both toxic and non-toxic aluminum supply.
- Taxon
- lucerneMedicago sativae1
- Outcome
- Concentrations below this peake0
- Qualifier
- non-toxic as well as toxic supplies of aluminiume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations below this peak could indicate non-toxic as well as toxic supplies of aluminium”
e1“In lucerne, aluminium concentrations in leaf dry matter”
Claim · model-written summary
Leaf analysis appears of little value for detecting aluminum problems in lucerne.
- Taxon
- lucerneMedicago sativae0
- Outcome
- Leaf analysise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf analysis, therefore, appears to be of little value in the detection of aluminium problems in lucerne”
Claim · model-written summary
Subterranean clover leaf aluminum concentrations exceeded 1 70 ppm dry matter at the highest aluminum level.
- Taxon
- subterranean clover
Trifolium subterraneume0 - Organ / stage
- leavese0
- Outcome
- aluminium concentrationse0
- Direction
- increasede0
- Value
- 1 70 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In subterranean clover leaves, aluminium concentrations increased to values in excess of 1 70 ppm of the dry matter at the highest aluminium level”
Claim · model-written summary
In potted subterranean clover, relative yield related inversely and linearly to leaf aluminum concentration.
- Taxon
- subterranean cloverTrifolium subterraneume1
- Compound
- aluminiume0
- Outcome
- relative yielde0
- Direction
- inversee0
- Setting
- two acid soilse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“close, inverse, linear relations were found between relative yield (Al/no Al x 100) and leaf aluminium concentrations”
e1“subterranean clover plants were grown in pots in two acid soils”
Claim · model-written summary
The yield–leaf-aluminum relation varied by soil, harvest and phosphorus level.
- Taxon
- subterranean cloverTrifolium subterraneume1
- Outcome
- These relationse0
- Direction
- differede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These relations differed between soils, harvests and phosphorus levels”
e1“subterranean clover plants”
Claim · model-written summary
The relations offer little help for quantitative estimates of aluminum-induced yield depression in subterranean clover.
- Taxon
- subterranean cloverTrifolium subterraneume0
- Outcome
- quantitative estimates of yield depressionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“would therefore be of little help in providing quantitative estimates of yield depressions in subterranean clover caused by aluminium”
Claim · model-written summary
The lines converged at 100-1 50 ppm leaf aluminum in plants without aluminum treatment.
- Taxon
- subterranean cloverTrifolium subterraneume1
- Outcome
- aluminium in leaf dry mattere0
- Value
- 100-1 50 ppme0
- Comparator
- no aluminium treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lines all converged within the range of 100-1 50 ppm aluminium in leaf dry matter of plants in the no aluminium treatment”
e1“subterranean clover plants”
Claim · model-written summary
The authors suggest a 100-1 50 ppm leaf aluminum threshold above which aluminum reduces subterranean clover yield.
- Taxon
- subterranean cloverTrifolium subterraneume2
- Compound
- aluminiume0
- Outcome
- yield reductionse0
- Value
- 100-1 50 ppme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this range represented a 'threshold' above which yield reductions due to aluminium occurred”
e1“100-1 50 ppm aluminium in leaf dry matter”
e2“subterranean clover plants”
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