Mitigation of arsenic accumulation in rice with water management and silicon fertilization

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Li, R-Y., Stroud, J. L., Ma, J. F., McGrath, S. P. and Zhao, F-J. 2009. Mitigation of arsenic accumulation in rice with water management and silicon fertilization. Environmental Science & Technology. 43 (10), pp. 3778-3783.

AuthorsLi, R-Y., Stroud, J. L., Ma, J. F., McGrath, S. P. and Zhao, F-J.

Rice represents a major route of As exposure in populations
that depend on a rice diet. Practical measures are needed to
mitigate the problem of excessive As accumulation in paddy
rice. Two potential mitigation methods, management of the water regime and Si fertilization, were investigated under greenhouse conditions. Growing rice aerobically during the entire rice growth duration resultedintheleastAs accumulation.Maintaining aerobic conditions during either vegetative or reproductive stage of rice growth also decreased As accumulation in rice straw and grain significantly compared with rice grown under flooded conditions. The effect of water management regimes was consistent with the observed effect of floodinginduced arsenite mobilization in the soil solution. Aerobic treatments increased the percentage of inorganic As in grain,
but the concentrations of inorganic As remained lower than
in the flooded rice. Silicon fertilization decreased the total As concentration in straw and grain by 78 and 16%, respectively, even though Si addition increased As concentration in the soil solution. Silicon also significantly influenced As speciation in rice grain and husk by enhancing methylation. Silicon decreased the inorganic As concentration in grain by 59% while increasingthe concentration of dimethylarsinic acid(DMA) by 33%. There were also significant differences between two rice genotypesin grainAsspeciation. Thisstudy demonstrated that water management, Si fertilization, and selection of rice
cultivars are effective measures that can be used to reduce As accumulation in rice.

Year of Publication2009
JournalEnvironmental Science & Technology
Journal citation43 (10), pp. 3778-3783
Digital Object Identifier (DOI)
Open accessPublished as green open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSEF
Trace element dynamics in soils and plant uptake
Soil protection and remediation
Characterising genetic and soil induced variation in arsenic uptake, translocation and metabolism in rice to mitigate arsenic contamination in Asia
Output statusPublished
Publication dates
Online14 Apr 2009
Publication process dates
Accepted14 Mar 2009
PublisherAmerican Chemical Society (ACS)

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