Abstract
A field experiment was conducted on the effect of biochar (BC) amendment on Cd uptake by rice (Oryza sativa L.) in a contaminated paddy in 2009 and 2010. BC was applied as a basal soil amendment before rice transplantation in 2009 at rates of 0, 10, 20, 40t ha-1, and rice yield and Cd uptake were monitored in both 2009 and 2010. The BC amendment significantly increased soil pH by 0.15-0.33 units in 2009 and 0.24-0.38 units in 2010, and decreased CaCl2 extracted Cd in soil by 32.0%-52.5% in 2009 and 5.5%-43.4% in 2010, respectively. Under BC amendment at 10, 20, 40 t ha-1, rice grain Cd concentration was observed to be reduced by 16.8%, 37.1%, and 45.0% in 2009 and by 42.7%, 39.9%, and 61.9% in 2010, while the total plant Cd uptake was found to decrease by 28.1%, 45.7%, and 54.2% in 2009 and by 14.4%, 35.9%, and 45.9% in 2010, respectively. Such effect of BC amendment on reducing Cd plant uptake has profound implications among those using bioresources for field application. Finally, BC amendment in combination with low Cd cultivars may offer a basic option to reduce Cd levels in rice as well as to reduce greenhouse gas emissions in rice agriculture in contaminated paddies.
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Claims 7
Claim · model-written summary
Biochar increased soil pH in both years.
- Taxon
- rice
Oryza sativat0 - Treatment
- BC amendmente0
- Outcome
- soil pHe0
- Direction
- increasede0
- Value
- 0.15-0.33 units in 2009 and 0.24-0.38 units in 2010e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BC amendment significantly increased soil pH by 0.15-0.33 units in 2009 and 0.24-0.38 units in 2010”
t0“rice”
Claim · model-written summary
Biochar decreased extractable soil cadmium in both years.
- Taxon
- riceOryza sativat0
- Treatment
- Biochar amendmentt0
- Outcome
- CaCl2 extracted Cd in soile0
- Direction
- decreasede0
- Value
- 32.0%-52.5% in 2009 and 5.5%-43.4% in 2010e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased CaCl2 extracted Cd in soil by 32.0%-52.5% in 2009 and 5.5%-43.4% in 2010”
t0“Biochar amendment greatly reduces rice Cd uptake”
Claim · model-written summary
Biochar at 10 t ha-1 reduced rice grain Cd concentration by 16.8% in 2009 and 42.7% in 2010.
- Taxon
- riceOryza sativae0
- Treatment
- BC amendment at 10e0
- Outcome
- rice grain Cd concentratione0
- Direction
- reducede0
- Value
- 16.8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under BC amendment at 10, 20, 40 t ha-1, rice grain Cd concentration was observed to be reduced by 16.8%, 37.1%, and 45.0% in 2009 and by 42.7%, 39.9%, and 61.9% in 2010”
Claim · model-written summary
Biochar at 20 t ha-1 reduced rice grain Cd concentration by 37.1% in 2009 and 39.9% in 2010.
- Taxon
- riceOryza sativae0
- Treatment
- 20e0
- Outcome
- rice grain Cd concentratione0
- Direction
- reducede0
- Value
- 37.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under BC amendment at 10, 20, 40 t ha-1, rice grain Cd concentration was observed to be reduced by 16.8%, 37.1%, and 45.0% in 2009 and by 42.7%, 39.9%, and 61.9% in 2010”
Claim · model-written summary
Biochar at 40 t ha-1 reduced rice grain Cd concentration by 45.0% in 2009 and 61.9% in 2010.
- Taxon
- riceOryza sativae0
- Treatment
- 40 t ha-1e0
- Outcome
- rice grain Cd concentratione0
- Direction
- reducede0
- Value
- 45.0%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under BC amendment at 10, 20, 40 t ha-1, rice grain Cd concentration was observed to be reduced by 16.8%, 37.1%, and 45.0% in 2009 and by 42.7%, 39.9%, and 61.9% in 2010”
Claim · model-written summary
Total plant Cd uptake decreased under the three biochar rates in both years.
- Taxon
- riceOryza sativat0
- Treatment
- Biochar amendmentt0
- Outcome
- total plant Cd uptakee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the total plant Cd uptake was found to decrease by 28.1%, 45.7%, and 54.2% in 2009 and by 14.4%, 35.9%, and 45.9% in 2010, respectively”
t0“Biochar amendment greatly reduces rice Cd uptake”
Claim · model-written summary
Biochar combined with low Cd cultivars may reduce Cd levels in rice and greenhouse gas emissions.
- Taxon
- riceOryza sativae0
- Treatment
- BC amendment in combination with low Cd cultivarse0
- Outcome
- reduce Cd levels in rice as well as to reduce greenhouse gas emissionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BC amendment in combination with low Cd cultivars may offer a basic option to reduce Cd levels in rice as well as to reduce greenhouse gas emissions in rice agriculture in contaminated paddies.”
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See all 86 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.