Abstract
Iron (Fe) and manganese (Mn) toxicity is a widespread problem in lentil production in the coastal dryland of Chile. Increasing the soil pH by liming with CaCO3 or incrementing grain yields through nitrogen fertilization can help the plants to reduce metal concentration. Thus, the main objective of this work was to evaluate two different fertilization strategies (lime (CaCO3) and nitrogen (N) additions) to reduce Fe and Mn toxicities in lentils. Lentils grown under field conditions with the highest Fe and Mn concentrations showed toxicity symptoms, but without grain yield reductions. In a pot experiment using the same soil as in the field with toxicity symptoms, the dry matter (DM) produced at the end of the trial was higher in the plants that received N while the lowest DM production was recorded in those plants treated with lime. In particular, higher root DM sustained the growth of the N-fertilized shoots, which also positively affected the grain yields being 33% higher than the control treatment (no fertilization addition). In the plants fertilized with N, the Fe and Mn levels in the shoots were lower than the control plants and those grown in soils treated with lime, but showed higher concentrations of Fe and Mn in roots. In parallel, roots exhibited high concentrations of Fe and Mn that were 13- and 9-fold higher than in the shoots. Additionally, a significant decrease of 29% in Mn concentration in the grains of plants treated with N was reported. Overall, our results suggest that an increase in DM of lentils by the addition of N can reduce the Mn concentration on leaves to a level that is likely under the threshold that causes toxicity in plant tissues. Finally, we conclude that the increase of Fe and Mn in the roots may be connected to the reduction of these metals on leaves.
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Claims 13
Claim · model-written summary
Lentils with the highest iron and manganese concentrations showed toxicity symptoms.
- Taxon
- Lentils
Lens culinarise0 - Outcome
- toxicity symptomse0
- Qualifier
- highest Fe and Mn concentrationse0
- Setting
- field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentils grown under field conditions with the highest Fe and Mn concentrations showed toxicity symptoms, but without grain yield reductions.”
Claim · model-written summary
Those field lentils had no grain yield reductions.
- Taxon
- LentilsLens culinarise0
- Outcome
- grain yield reductionse0
- Direction
- withoute0
- Setting
- field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentils grown under field conditions with the highest Fe and Mn concentrations showed toxicity symptoms, but without grain yield reductions.”
Claim · model-written summary
Nitrogen treated plants produced more dry matter in the pot experiment.
- Taxon
- LentilLens culinarist0
- Treatment
- Ne0
- Outcome
- dry matter (DM)e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dry matter (DM) produced at the end of the trial was higher in the plants that received N”
t0“Lentil Crops”
Claim · model-written summary
Lime treated plants had the lowest dry matter production.
- Taxon
- LentilLens culinarist0
- Treatment
- limee0
- Outcome
- DM productione0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest DM production was recorded in those plants treated with lime”
t0“Lentil Crops”
Claim · model-written summary
Nitrogen fertilization supported higher root dry matter.
- Taxon
- LentilLens culinarist0
- Organ / stage
- roote0
- Treatment
- N-fertilizede0
- Outcome
- root DMe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher root DM sustained the growth of the N-fertilized shoots”
t0“Lentil Crops”
Claim · model-written summary
Nitrogen fertilization increased grain yield by 33% over no fertilization.
- Taxon
- LentilLens culinarist0
- Treatment
- N-fertilizede1
- Outcome
- grain yieldse0
- Direction
- highere0
- Value
- 33%e0
- Comparator
- control treatment (no fertilization addition)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yields being 33% higher than the control treatment (no fertilization addition)”
t0“Lentil Crops”
e1“higher root DM sustained the growth of the N-fertilized shoots”
Claim · model-written summary
Nitrogen treated shoots had lower iron levels than controls and lime treated plants.
- Taxon
- LentilLens culinarist0
- Organ / stage
- shootse0
- Treatment
- Ne0
- Outcome
- Fe and Mn levels in the shootse0
- Direction
- lowere0
- Comparator
- control plants and those grown in soils treated with limee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the plants fertilized with N, the Fe and Mn levels in the shoots were lower than the control plants and those grown in soils treated with lime”
t0“Lentil Crops”
Claim · model-written summary
Nitrogen treated roots had higher iron and manganese concentrations.
- Taxon
- LentilLens culinarist0
- Organ / stage
- rootse0
- Treatment
- Ne1
- Outcome
- concentrations of Fe and Mn in rootse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but showed higher concentrations of Fe and Mn in roots”
t0“Lentil Crops”
e1“In the plants fertilized with N”
Claim · model-written summary
Root iron concentration was 13 times the shoot concentration.
- Taxon
- LentilLens culinarist0
- Organ / stage
- rootse0
- Outcome
- concentrations of Fee0
- Direction
- highere0
- Value
- 13-e0
- Comparator
- shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roots exhibited high concentrations of Fe and Mn that were 13- and 9-fold higher than in the shoots”
t0“Lentil Crops”
Claim · model-written summary
Root manganese concentration was nine times the shoot concentration.
- Taxon
- LentilLens culinarist0
- Organ / stage
- rootse0
- Outcome
- Mne0
- Direction
- highere0
- Value
- 9-folde0
- Comparator
- shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roots exhibited high concentrations of Fe and Mn that were 13- and 9-fold higher than in the shoots”
t0“Lentil Crops”
Claim · model-written summary
Nitrogen treatment significantly reduced grain manganese concentration by 29%.
- Taxon
- LentilLens culinarist0
- Organ / stage
- grainse0
- Treatment
- Ne0
- Outcome
- Mn concentration in the grainse0
- Direction
- decreasee0
- Value
- 29%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant decrease of 29% in Mn concentration in the grains of plants treated with N was reported”
t0“Lentil Crops”
Claim · model-written summary
The authors suggest nitrogen driven dry matter gain can lower leaf manganese below the toxicity threshold.
- Taxon
- lentilsLens culinarise0
- Treatment
- addition of Ne0
- Outcome
- Mn concentration on leavese0
- Direction
- reducee0
- Qualifier
- likely under the threshold that causes toxicity in plant tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in DM of lentils by the addition of N can reduce the Mn concentration on leaves to a level that is likely under the threshold that causes toxicity in plant tissues”
Claim · model-written summary
The authors associate greater root iron and manganese with lower leaf metal levels.
- Taxon
- LentilLens culinarist0
- Organ / stage
- rootse0
- Outcome
- reduction of these metals on leavese0
- Qualifier
- may be connectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of Fe and Mn in the roots may be connected to the reduction of these metals on leaves”
t0“Lentil Crops”
The same questions in other papers
nitrogen · yield · Lens culinaris (lentil)Results differ
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- no effect
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- negative
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See all 8 papers →nitrogen · growth · Lens culinaris (lentil)Positive and negative results
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See all 14 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.