Abstract
Abstract Iron toxicity is a widespread nutrient disorder in lowland rice, notably in West Africa. It occurs in irrigated or rain‐fed rice crops when the soil contains excessive amounts of iron. Associated with leaf discoloration symptoms (bronzing), this excessive iron uptake causes poor growth and tillering and leads to severe yield reductions. Field experiments were carried out in West Africa from 1994 to 1998 at two sites with high iron toxicity and one non‐toxic site to assess the effects of iron toxicity on rice cropping and evaluate the tolerance of promising rice cultivars available in West Africa. To estimate yield losses caused by iron toxicity, the yield potential was simulated using the ORYZA‐S rice growth and yield model. Based on the potential yield, the yield loss in an iron‐toxic site is the combination of the yield gap caused by unknown site factors and the yield gap caused by iron toxicity. Compared to the referential yield obtained in a non‐iron‐toxic site, iron toxicity reduced rice yields by 16–78 % (mean 43 %). The extent of the yield loss depended on rice cultivar, iron toxicity intensity and crop management strategy (water control and mineral fertilisation). A strong correlation obtained between yield and the iron toxicity score, based on visual symptoms indicated an approx. 400 kg ha −1 yield loss for each visual score point increase. The high genetic variability in iron toxicity tolerance and close correlation between leaf symptom score and grain yield between rice genotypes provide a good basis for breeding varieties that can produce higher yields under iron‐toxic conditions.
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Claims 6
Claim · model-written summary
Iron toxicity reduced rice yields by 16–78 %, averaging 43 %.
- Taxon
- rice
Oryza sativae0 - Treatment
- iron toxicitye0
- Outcome
- rice yieldse0
- Direction
- reducede0
- Value
- 16–78 %e0
- Qualifier
- mean 43 %e0
- Comparator
- referential yield obtained in a non‐iron‐toxic sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the referential yield obtained in a non‐iron‐toxic site, iron toxicity reduced rice yields by 16–78 % (mean 43 %)”
Claim · model-written summary
Yield loss varied with cultivar, toxicity intensity and crop management.
- Taxon
- riceOryza sativae0
- Material
- rice cultivare0
- Outcome
- extent of the yield losse0
- Qualifier
- iron toxicity intensity and crop management strategy (water control and mineral fertilisation)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of the yield loss depended on rice cultivar, iron toxicity intensity and crop management strategy (water control and mineral fertilisation)”
Claim · model-written summary
Each visual iron toxicity score point corresponded to about 400 kg ha −1 yield loss.
- Taxon
- RiceOryza sativat0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 400 kg ha −1e0
- Comparator
- iron toxicity scoree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong correlation obtained between yield and the iron toxicity score, based on visual symptoms indicated an approx. 400 kg ha −1 yield loss for each visual score point increase”
t0“Rice Yield Gap due to Iron Toxicity”
Claim · model-written summary
Rice genotypes varied strongly in iron toxicity tolerance.
- Taxon
- riceOryza sativae0
- Outcome
- high genetic variability in iron toxicity tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high genetic variability in iron toxicity tolerance and close correlation between leaf symptom score and grain yield between rice genotypes”
Claim · model-written summary
Leaf symptom score correlated closely with grain yield across genotypes.
- Taxon
- riceOryza sativae0
- Organ / stage
- leafe0
- Outcome
- grain yielde0
- Qualifier
- leaf symptom scoree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“close correlation between leaf symptom score and grain yield between rice genotypes”
Claim · model-written summary
The authors propose using tolerance variability and leaf scores to breed for higher yields under iron toxicity.
- Taxon
- RiceOryza sativat0
- Outcome
- breeding varieties that can produce higher yields under iron‐toxic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“provide a good basis for breeding varieties that can produce higher yields under iron‐toxic conditions”
t0“Rice Yield Gap due to Iron Toxicity”
The same questions in other papers
iron atom · yield · Oryza sativa (rice)Results differ
13 papers in the same direction as this paper · 57 in the opposite direction
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