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United States Department of Agriculture

Agricultural Research Service

Research Project: Organic Rice Production Practices to Minimize Grain Arsenic Accumulation

Location: Dale Bumpers National Rice Research Center

Project Number: 6028-21000-010-23
Project Type: Trust

Start Date: Dec 01, 2012
End Date: Nov 30, 2014

Objective:
This study will determine: 1) if rice cultivars differ in grain arsenic accumulation, 2) how do changes in soil chemistry as a result of organic or conventional management practices relate to arsenic accumulation in rice grain, 3) to what extent does milling reduce grain arsenic content as compared to brown rice, and 4) how do different rates and organic fertilizer amendments impact soil chemistry and grain arsenic accumulation.

Approach:
Grain and soil samples from studies conducted previously under organic and conventional management practices will be analyzed for total arsenic content. Soil samples will also be analyzed for pH, organic matter, and mineral content. Treatments include rice varieties, fertilizer amendment products, fertilizer rates, and years. Grain samples will include whole grain brown rice and whole grain milled rice. Grain arsenic and soil chemistry assays will be performed through a commercial lab. On samples that are high for total grain arsenic, speciation analysis will be performed to determined inorganic and organic forms of arsenic. Results will be used to determine to what extent choice of variety, post-harvest processing, and fertilizer amendments can be used to minimize grain arsenic content under organic production systems.

Last Modified: 12/22/2014
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