Abstract
The influence of three Fe levels (0.1, 0.5, 2.5 ppm) and four Mn levels (0.005, 0.05, 0.5, 1.0 ppm) in all combinations in nutrient solutions were studied in the greenhouse with barley plants. At the anthesis stage, the dry matter yield increased with increasing Fe supply when the Mn level was below optimum (0.005 ppm) or approximately optimum (0.05 ppm). At maturity, the yields of kernels and straw increased with increasing Fe supply regardless of the Mn level. Mn deficiency symptoms were evident at the lowest Mn level and were not influenced by the Fe supply. Dry matter yields at the two highest Mn levels were lower than those at the 0.05-ppm Mn level at both the anthesis and mature stages. Mn toxicity symptoms were evident only at the highest Mn level. The critical Mn concentration in the four uppermost leaf blades associated with reduced dry matter yield was approximately 15 ppm regardless of the Fe supply. The critical Mn concentration in leaves plus stem was slightly lower than that for leaf blades only. Similar results were obtained with two barley cultivars. It was concluded that increasing the Fe supply does not reduce Mn availability or concentration in barley plants when the Mn supply ranges from below to approximately optimum but may do so when the Mn supply is above optimum.
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Claims 12
Claim · model-written summary
At anthesis, increasing Fe increased dry matter yield at deficient or near-optimal Mn.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- increasing Fe supplye0
- Outcome
- dry matter yielde0
- Direction
- increasede0
- Qualifier
- when the Mn level was below optimum (0.005 ppm) or approximately optimum (0.05 ppm)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“At the anthesis stage, the dry matter yield increased with increasing Fe supply when the Mn level was below optimum (0.005 ppm) or approximately optimum (0.05 ppm).”
e1“greenhouse with barley plants”
Claim · model-written summary
At maturity, increasing Fe raised kernel yield at all Mn levels.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- increasing Fe supplye0
- Outcome
- yields of kernelse0
- Direction
- increasede0
- Qualifier
- regardless of the Mn levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At maturity, the yields of kernels and straw increased with increasing Fe supply regardless of the Mn level.”
e1“greenhouse with barley plants”
Claim · model-written summary
At maturity, increasing Fe raised straw yield at all Mn levels.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- increasing Fe supplye0
- Outcome
- strawe0
- Direction
- increasede0
- Qualifier
- regardless of the Mn levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At maturity, the yields of kernels and straw increased with increasing Fe supply regardless of the Mn level.”
e1“greenhouse with barley plants”
Claim · model-written summary
Mn deficiency symptoms appeared at the lowest Mn level.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- Mn deficiency symptomse0
- Qualifier
- at the lowest Mn levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn deficiency symptoms were evident at the lowest Mn level”
e1“greenhouse with barley plants”
Claim · model-written summary
Fe supply did not alter Mn deficiency symptoms.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- Fe supplye0
- Outcome
- Mn deficiency symptomse0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn deficiency symptoms were evident at the lowest Mn level and were not influenced by the Fe supply.”
e1“greenhouse with barley plants”
Claim · model-written summary
The two highest Mn levels lowered dry matter yield relative to 0.05 ppm at anthesis and maturity.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- two highest Mn levelse0
- Outcome
- Dry matter yieldse0
- Direction
- lowere0
- Qualifier
- at both the anthesis and mature stagese0
- Comparator
- 0.05-ppm Mn levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yields at the two highest Mn levels were lower than those at the 0.05-ppm Mn level at both the anthesis and mature stages.”
e1“greenhouse with barley plants”
Claim · model-written summary
Mn toxicity symptoms appeared only at the highest Mn level.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- Mn toxicity symptomse0
- Qualifier
- at the highest Mn levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn toxicity symptoms were evident only at the highest Mn level.”
e1“greenhouse with barley plants”
Claim · model-written summary
The critical leaf-blade Mn concentration associated with reduced dry matter yield was approximately 15 ppm.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- four uppermost leaf bladese0
- Compound
- Mne0
- Outcome
- reduced dry matter yielde0
- Direction
- reducede0
- Value
- approximately 15 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical Mn concentration in the four uppermost leaf blades associated with reduced dry matter yield was approximately 15 ppm regardless of the Fe supply.”
e1“greenhouse with barley plants”
Claim · model-written summary
Critical Mn concentration in leaves plus stem was slightly below that in leaf blades alone.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- leaves plus steme0
- Outcome
- critical Mn concentratione0
- Direction
- slightly lowere0
- Comparator
- leaf blades onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical Mn concentration in leaves plus stem was slightly lower than that for leaf blades only.”
e1“greenhouse with barley plants”
Claim · model-written summary
Results were similar for two barley cultivars.
- Taxon
- barleyHordeum vulgaree0
- Material
- two barley cultivarse0
- Outcome
- Similar resultse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were obtained with two barley cultivars.”
Claim · model-written summary
Authors conclude increasing Fe does not lower barley Mn availability or concentration when Mn is below or near optimum.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- increasing the Fe supplye0
- Outcome
- Mn availability or concentratione0
- Direction
- does not reducee0
- Qualifier
- when the Mn supply ranges from below to approximately optimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the Fe supply does not reduce Mn availability or concentration in barley plants when the Mn supply ranges from below to approximately optimum”
Claim · model-written summary
Authors conclude increasing Fe may lower barley Mn availability or concentration when Mn is above optimum.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- increasing the Fe supplye1
- Outcome
- Mn availability or concentratione1
- Direction
- decreaseinferrede0
- Qualifier
- when the Mn supply is above optimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but may do so when the Mn supply is above optimum.”
e1“increasing the Fe supply does not reduce Mn availability or concentration in barley plants”
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See all 15 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.