Abstract
Abstract Rice plants ( Oryza sativa var. ‘Colusa’) were grown to maturity in pots containing a soil (Domino silt loam, pH 7.5, Xerollic calciorthid ) amended with 1% sewage sludge enriched with variable amounts of CdSO 4 ranging up to 640 µg Cd/g. Two sets of soil cultures were used, one for rice under continuous flood and the other under nonflood conditions. Grain production for rice under flood management was relatively unaffected by the Cd treatment; 25% yield decrement was associated with a treatment of 320 µg Cd/g. Under nonflood management, however, a comparable decrement in grain production was observed with a treatment of only 17 µg Cd/g. The Cd content of mature leaves at early flowering varied from approximately 0.3 µg Cd/g for the controls to 2.8 µg Cd/g for plants receiving the highest Cd treatments. Leaf Cd values were slightly higher under the nonflood culture. The Cd content of the grain under nonflood management was approximately 55% greater than that of grain under flood management. The Cd content of mature leaves correlated with grain production ( r = 0.872***) for rice produced under either flood or nonflood culture. Chemical analysis of saturation extracts revealed greatly reduced Cd concentrations in soil solutions under flood management which may account for the greater tolerance of the cultivar to soil Cd under flood culture. This reduced availability of Cd in flooded soils is attributed to precipitation of CdS.
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Claims 9
Claim · model-written summary
Under flood management, 320 µg Cd/g was associated with a 25% grain yield decrement.
- Taxon
- rice
Oryza sativae0 - Treatment
- 320 µg Cd/ge0
- Outcome
- yield decremente0
- Direction
- decremente0
- Value
- 25%e0
- Setting
- flood managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain production for rice under flood management was relatively unaffected by the Cd treatment; 25% yield decrement was associated with a treatment of 320 µg Cd/g”
Claim · model-written summary
Under nonflood management, 17 µg Cd/g produced a comparable grain yield decrement.
- Taxon
- RiceOryza sativat0
- Treatment
- 17 µg Cd/ge0
- Outcome
- decrement in grain productione0
- Direction
- decremente0
- Value
- 17 µg Cd/ge0
- Setting
- nonflood managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under nonflood management, however, a comparable decrement in grain production was observed with a treatment of only 17 µg Cd/g”
t0“Rice”
Claim · model-written summary
Mature leaf cadmium rose from about 0.3 µg Cd/g in controls to 2.8 µg Cd/g at the highest treatments.
- Taxon
- RiceOryza sativat0
- Organ / stage
- mature leaves at early floweringe0
- Treatment
- highest Cd treatmentse0
- Outcome
- Cd content of mature leavese0
- Value
- 2.8 µg Cd/ge0
- Qualifier
- 0.3 µg Cd/ge0
- Comparator
- controlse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd content of mature leaves at early flowering varied from approximately 0.3 µg Cd/g for the controls to 2.8 µg Cd/g for plants receiving the highest Cd treatments”
t0“Rice”
Claim · model-written summary
Leaf cadmium was slightly higher under nonflood culture.
- Taxon
- RiceOryza sativat0
- Outcome
- Leaf Cd valuese0
- Direction
- highere0
- Setting
- nonflood culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf Cd values were slightly higher under the nonflood culture”
t0“Rice”
Claim · model-written summary
Nonflood grain cadmium was approximately 55% greater than flood grain cadmium.
- Taxon
- RiceOryza sativat0
- Treatment
- nonflood managemente0
- Outcome
- Cd content of the graine0
- Direction
- greatere0
- Value
- 55%e0
- Comparator
- flood managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd content of the grain under nonflood management was approximately 55% greater than that of grain under flood management”
t0“Rice”
Claim · model-written summary
Mature leaf cadmium content correlated with grain production under both water regimes.
- Taxon
- riceOryza sativae0
- Organ / stage
- mature leavese0
- Compound
- Cde0
- Outcome
- grain productione0
- Value
- r = 0.872***e0
- Setting
- flood or nonflood culturee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd content of mature leaves correlated with grain production ( r = 0.872***) for rice produced under either flood or nonflood culture”
Claim · model-written summary
Flood management greatly reduced cadmium concentration in soil solution.
- Taxon
- RiceOryza sativat0
- Treatment
- flood managemente0
- Outcome
- Cd concentrations in soil solutionse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical analysis of saturation extracts revealed greatly reduced Cd concentrations in soil solutions under flood management”
t0“Rice”
Claim · model-written summary
Reduced soil cadmium availability may explain greater rice tolerance during flooding.
- Taxon
- RiceOryza sativat0
- Outcome
- greater tolerance of the cultivar to soil Cde0
- Qualifier
- reduced Cd concentrations in soil solutionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greatly reduced Cd concentrations in soil solutions under flood management which may account for the greater tolerance of the cultivar to soil Cd under flood culture”
t0“Rice”
Claim · model-written summary
Reduced cadmium availability in flooded soils was attributed to CdS precipitation.
- Taxon
- RiceOryza sativat0
- Compound
- CdSe0
- Outcome
- reduced availability of Cd in flooded soilse0
- Qualifier
- precipitation of CdSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This reduced availability of Cd in flooded soils is attributed to precipitation of CdS”
t0“Rice”
The same questions in other papers
cadmium atom · nutrient: content · Oryza sativa (rice)Results differ
33 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
43 papers more in this group
See all 47 papers →flooding · nutrient: content · Oryza sativa (rice)Positive and negative results
41 papers in the same direction as this paper · 29 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- negative
68 papers more in this group
See all 72 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.