Abstract
Silicon deficiency limits rice ( Oryza sativa L.) yield on highly weathered upland soils in West Africa and can increase susceptibility to some diseases. A study at Onne, Nigeria, examined responses of different genotypes to increasing Si supply under upland cultural conditions. Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency. Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration and increased grain yield by 48%, and significantly reduced the severity of husk discoloration, neck blast, sheath blight, and leaf scald diseases. When grown in flooded paddies on the same soil at Onne, and on a more fertile Alfisol at Ibadan, mean leaf Si concentrations were two to three times greater than in Si‐treated upland plots, and diseases were negligible. Under upland cultivation, African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves, and were more resistant to husk discoloration and neck blast, than Asian indica upland genotypes. The japonicas were equally susceptible to leaf scald, however, and more susceptible to sheath blight than the indicas. It is concluded that increasing the supply of Si to the crop through flooding is the most effective method of ameliorating Si deficiency. Where this is not practical, genes for higher Si content can probably reduce losses to some diseases, but other genetic factors seem also to have major effects.
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Claims 14
Claim · model-written summary
Without applied Si, rice shoot Si concentration was one-fifth of the minimum recommended value
- Taxon
- rice
Oryza sativae1 - Outcome
- average shoot Si concentratione1
- Value
- one‐fifth of the minimum recommended valuee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
Claim · model-written summary
Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration relative to no applied Si
- Taxon
- riceOryza sativae1
- Treatment
- Application of 18.7 g Si m −2 as sodium metasilicatee2
- Outcome
- plant Si concentratione2
- Direction
- doublede2
- Comparator
- Without applied Sie1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e2“Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration and increased grain yield by 48%, and significantly reduced the severity of husk discoloration, neck blast, sheath blight, and leaf scald diseases”
Claim · model-written summary
Application of 18.7 g Si m −2 as sodium metasilicate increased rice grain yield by 48% relative to no applied Si
- Taxon
- riceOryza sativae1
- Treatment
- Application of 18.7 g Si m −2 as sodium metasilicatee2
- Outcome
- grain yielde2
- Direction
- increasede2
- Value
- 48%e2
- Comparator
- Without applied Sie1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e2“Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration and increased grain yield by 48%, and significantly reduced the severity of husk discoloration, neck blast, sheath blight, and leaf scald diseases”
Claim · model-written summary
Application of 18.7 g Si m −2 as sodium metasilicate significantly reduced the severity of husk discoloration, neck blast and sheath blight in rice relative to no applied Si
- Taxon
- riceOryza sativae1
- Treatment
- Application of 18.7 g Si m −2 as sodium metasilicatee2
- Outcome
- severity of husk discoloration, neck blast, sheath blighte2
- Direction
- reducede2
- Comparator
- Without applied Sie1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e2“Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration and increased grain yield by 48%, and significantly reduced the severity of husk discoloration, neck blast, sheath blight, and leaf scald diseases”
Claim · model-written summary
Application of 18.7 g Si m −2 as sodium metasilicate significantly reduced the severity of rice leaf scald relative to no applied Si
- Taxon
- riceOryza sativae1
- Treatment
- Application of 18.7 g Si m −2 as sodium metasilicatee2
- Outcome
- leaf scalde2
- Direction
- reducede2
- Comparator
- Without applied Sie1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e2“Application of 18.7 g Si m −2 as sodium metasilicate doubled plant Si concentration and increased grain yield by 48%, and significantly reduced the severity of husk discoloration, neck blast, sheath blight, and leaf scald diseases”
Claim · model-written summary
Rice grown in flooded paddies had two to three times greater mean leaf Si concentrations than Si-treated upland plots
- Taxon
- riceOryza sativae1
- Treatment
- flooded paddiese3
- Outcome
- mean leaf Si concentrationse3
- Direction
- greatere3
- Value
- two to three timese3
- Comparator
- Si‐treated upland plotse3
- Setting
- Onnee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e3“When grown in flooded paddies on the same soil at Onne, and on a more fertile Alfisol at Ibadan, mean leaf Si concentrations were two to three times greater than in Si‐treated upland plots, and diseases were negligible”
Claim · model-written summary
Rice diseases were negligible when grown in flooded paddies at Onne
- Taxon
- riceOryza sativae1
- Outcome
- diseasese3
- Qualifier
- negligiblee3
- Setting
- flooded paddies on the same soil at Onnee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e3“When grown in flooded paddies on the same soil at Onne, and on a more fertile Alfisol at Ibadan, mean leaf Si concentrations were two to three times greater than in Si‐treated upland plots, and diseases were negligible”
Claim · model-written summary
African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves than Asian indica upland genotypes under upland cultivation
- Taxon
- riceOryza sativae4
- Material
- African japonica upland rice genotypese4
- Organ / stage
- mature flag leavese4
- Outcome
- Si concentration in mature flag leavese4
- Direction
- highere4
- Value
- 50 to 100%e4
- Comparator
- Asian indica upland genotypese4
- Setting
- Under upland cultivatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Under upland cultivation, African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves, and were more resistant to husk discoloration and neck blast, than Asian indica upland genotypes”
Claim · model-written summary
African japonica upland rice genotypes were more resistant to husk discoloration and neck blast than Asian indica upland genotypes
- Taxon
- riceOryza sativae4
- Material
- African japonica upland rice genotypese4
- Outcome
- husk discoloration and neck blaste4
- Direction
- more resistante4
- Comparator
- Asian indica upland genotypese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Under upland cultivation, African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves, and were more resistant to husk discoloration and neck blast, than Asian indica upland genotypes”
Claim · model-written summary
Japonica rice was equally susceptible to leaf scald as indica rice
- Taxon
- riceOryza sativae4
- Material
- japonicase5
- Outcome
- leaf scalde5
- Direction
- equally susceptiblee5
- Comparator
- indicase5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Under upland cultivation, African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves, and were more resistant to husk discoloration and neck blast, than Asian indica upland genotypes”
e5“The japonicas were equally susceptible to leaf scald, however, and more susceptible to sheath blight than the indicas”
Claim · model-written summary
Japonica rice was more susceptible to sheath blight than indica rice
- Taxon
- riceOryza sativae4
- Material
- japonicase5
- Outcome
- sheath blighte5
- Direction
- more susceptiblee5
- Comparator
- indicase5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Under upland cultivation, African japonica upland rice genotypes had 50 to 100% higher Si concentration in mature flag leaves, and were more resistant to husk discoloration and neck blast, than Asian indica upland genotypes”
e5“The japonicas were equally susceptible to leaf scald, however, and more susceptible to sheath blight than the indicas”
Claim · model-written summary
The authors conclude that increasing Si supply to rice through flooding is the most effective way to ameliorate Si deficiency
- Taxon
- riceOryza sativae1
- Treatment
- increasing the supply of Si to the crop through floodinge6
- Outcome
- ameliorating Si deficiencye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e6“It is concluded that increasing the supply of Si to the crop through flooding is the most effective method of ameliorating Si deficiency”
Claim · model-written summary
Genes for higher Si content can probably reduce rice losses to some diseases
- Taxon
- riceOryza sativae1
- Gene
- genes for higher Si contente7
- Outcome
- losses to some diseasese7
- Direction
- reducee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e7“Where this is not practical, genes for higher Si content can probably reduce losses to some diseases, but other genetic factors seem also to have major effects”
Claim · model-written summary
Other genetic factors seem also to have major effects on rice disease
- Taxon
- riceOryza sativae1
- Outcome
- major effectse7
- Qualifier
- other genetic factorse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Without applied Si, average shoot Si concentration was one‐fifth of the minimum recommended value for rice, confirming deficiency”
e7“Where this is not practical, genes for higher Si content can probably reduce losses to some diseases, but other genetic factors seem also to have major effects”
The same questions in other papers
sodium silicate · nutrient: content · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
sodium silicate · disease · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
sodium silicate · yield · Oryza sativa (rice)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.