Arsenic porewater dynamics and arsenic uptake by aman rice in intermittently and continuously flooded paddy fields in Bangladesh

摘要

In a field study in Jessore District, Bangladesh, we investigated arsenic (As) porewater dynamics and As uptake by monsoon rice (aman) grown under continuously and intermittently flooded conditions, respectively. As porewater concentrations above the plough pan reached up to 500 ug/L under continuous flooding, but remained below 200 ug/L As under intermittently flooded conditions. Compared to continuous flooding, intermittent flooding thus reduced the As content of aman straw and grain by factors of 3 and 2.5, respectively. Our results corroborate previous evidence that intermittent flooding of paddy fields may be a promising means of reducing As input to paddy soils and As uptake by rice plants.