Abstract
Abstract Some indica rice varieties are potential phytoextractors for paddy fields polluted with Cd because of their high biomass and because they can accumulate Cd to moderate levels in their shoots. To establish a practical phytoextraction system, phytoextraction using two indica rice cultivars (MORETSU and IR-8) was carried out in a paddy field polluted with moderate Cd levels (2.91 and 2.52 mg kg−1, respectively). The Cd concentration and Cd uptake of MORETSU increased when irrigation water was drained at the maximum tillering stage, and the paddy soil was under oxidative conditions until harvesting. The Cd uptake of MORETSU and IR-8 increased and reached 516 and 657 g ha−1, respectively, at the beginning of October. After phytoextraction using these high Cd accumulating rice varieties for 2 years, the Cd concentration in the paddy field decreased by 18% compared with the initial Cd concentration. The Cd concentration in the rice grains of a japonica ordinary rice variety (HINOHIKARI) subsequently grown on the field after the phytoextraction was lower than the concentration in rice grown on a non-phytoextracted field. These results suggest that phytoextraction using high Cd accumulating rice varieties with early drainage of irrigation water is a practical remediation system for moderate Cd polluted paddy fields in southwest Japan.
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Claims 7
Claim · model-written summary
Early drainage increased MORETSU cadmium concentration.
- Taxon
- rice
Oryza sativat0 - Material
- MORETSUe0
- Organ / stage
- maximum tillering stagee0
- Treatment
- irrigation water was drained at the maximum tillering stagee0
- Outcome
- Cd concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd concentration and Cd uptake of MORETSU increased when irrigation water was drained at the maximum tillering stage, and the paddy soil was under oxidative conditions until harvesting.”
t0“rice plant”
Claim · model-written summary
Early drainage increased MORETSU cadmium uptake.
- Taxon
- riceOryza sativat0
- Material
- MORETSUe0
- Treatment
- irrigation water was drained at the maximum tillering stagee0
- Outcome
- Cd uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd concentration and Cd uptake of MORETSU increased when irrigation water was drained at the maximum tillering stage, and the paddy soil was under oxidative conditions until harvesting.”
t0“rice plant”
Claim · model-written summary
MORETSU cadmium uptake increased to 516 g ha−1 by early October.
- Taxon
- riceOryza sativat0
- Material
- MORETSUe0
- Outcome
- Cd uptakee0
- Direction
- increasede0
- Value
- 516e0
- Qualifier
- at the beginning of Octobere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd uptake of MORETSU and IR-8 increased and reached 516 and 657 g ha−1, respectively, at the beginning of October.”
t0“rice plant”
Claim · model-written summary
IR-8 cadmium uptake increased to 657 g ha−1 by early October.
- Taxon
- riceOryza sativat0
- Material
- IR-8e0
- Outcome
- Cd uptakee0
- Direction
- increasede0
- Value
- 657 g ha−1e0
- Qualifier
- at the beginning of Octobere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd uptake of MORETSU and IR-8 increased and reached 516 and 657 g ha−1, respectively, at the beginning of October.”
t0“rice plant”
Claim · model-written summary
Two years of rice phytoextraction lowered paddy soil cadmium concentration by 18% relative to its initial concentration.
- Taxon
- riceOryza sativat0
- Treatment
- phytoextraction using these high Cd accumulating rice varieties for 2 yearse0
- Outcome
- Cd concentration in the paddy fielde0
- Direction
- decreasede0
- Value
- 18%e0
- Comparator
- initial Cd concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After phytoextraction using these high Cd accumulating rice varieties for 2 years, the Cd concentration in the paddy field decreased by 18% compared with the initial Cd concentration.”
t0“rice plant”
Claim · model-written summary
HINOHIKARI grain cadmium concentration was lower after phytoextraction than in grain from a field without phytoextraction.
- Taxon
- riceOryza sativat0
- Material
- HINOHIKARIe0
- Organ / stage
- rice grainse0
- Treatment
- phytoextractione0
- Outcome
- Cd concentration in the rice grainse0
- Direction
- lowere0
- Comparator
- non-phytoextracted fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cd concentration in the rice grains of a japonica ordinary rice variety (HINOHIKARI) subsequently grown on the field after the phytoextraction was lower than the concentration in rice grown on a non-phytoextracted field.”
t0“rice plant”
Claim · model-written summary
The authors propose early drainage with high cadmium accumulating rice as practical remediation of moderately polluted paddies in southwest Japan.
- Taxon
- riceOryza sativat0
- Treatment
- phytoextraction using high Cd accumulating rice varieties with early drainage of irrigation watere0
- Outcome
- practical remediation systeme0
- Setting
- southwest Japane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytoextraction using high Cd accumulating rice varieties with early drainage of irrigation water is a practical remediation system for moderate Cd polluted paddy fields in southwest Japan.”
t0“rice plant”
The same questions in other papers
cadmium atom · nutrient: content · Oryza sativa (rice)Results differ
12 papers in the same direction as this paper · 34 in the opposite direction
- no effect
- negative
- negative
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See all 47 papers →tillage · nutrient: content · Oryza sativa (rice)Positive and negative results
97 papers in the same direction as this paper · 10 in the opposite direction
- negative
- negative
- negative
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See all 108 papers →irrigation · nutrient: content · Oryza sativa (rice)Positive and negative results
118 papers in the same direction as this paper · 24 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
140 papers more in this group
See all 144 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.