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Position: Home > Articles > Agronomic strategies to reduce the arsenic content in rice in environments conducive to high arsenic in grains from Argentina Pedosphere 2023

Agronomic strategies to reduce the arsenic content in rice in environments conducive to high arsenic in grains from Argentina

作  者：
María Romina BEFANI;César Quintero;JF Panozzo;María de los Ángeles Zamero;Luis F. RISSO;María Concepción SANSÓ;Juan Hernande
单  位：
Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Ríos, Oro Verde (Argentina;Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Ríos, Oro Verde (Argentina)
关键词：
grain;irrigation;total as;contents;affect;as accumulatio
摘  要：
In rice paddy systems under continuous flooded irrigation, rice grains with high arsenic (As) content can be produced. In Argentina, these areas are located in the south of Corrientes and the north of Entre Ríos provinces. The combination of management practices, genetic materials, and the characteristics of soil and water resources, determines the content and proportion of grain As species. In this study, we evaluated two main factors that affect grain As accumulation: irrigation management (continuous and interrupted flood) and, commercial types of rice (medium, double, and long grain). The experiments were conducted between 2015-2021 years, in a farm in the north of Entre Ríos. Total As concentration in husked grain showed a wide range, and was mostly above 0.30 mg kg-1, even after the polishing process. Fortunately, organic As was the predominant species. In polished rice, inorganic As contents ranged between 0.02-0.28 mg kg-1. Significant differences were observed between the varieties, resulting in the highest As values for medium-sized grain commercial types. The interaction variety by irrigation did not affect the grain yield, but significantly reduced total As contents in grain. Soil drainage 15 days before panicle differentiation explained 43-46 % of the reduction of total As in grain. The management irrigation and rice types had a slight effect on the content of grain inorganic As. In conclusion, a single soil drying period combined with certain rice varieties can be an effective practice for mitigating As accumulation in rice grain.

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