Irrigation management for arsenic mitigation in rice grain: Timing and severity of a single soil drying

The Science of the Total Environment
Daniela R CarrijoBruce A Linquist

Abstract

The accumulation of arsenic (As) in rice grain is a public health concern since As is toxic to humans; in particular, inorganic As can cause many chronic diseases including cancer. Rice crops are prone to accumulating As, in part, due to the anaerobic soil conditions triggered by the traditional continuously flooded irrigation practice. The objective of this study was to determine how the severity and the timing (i.e. crop stage) of a single soil drying period impact total As concentration and As speciation within the rice (both white and brown) grain, compared to a continuously flooded (CF) control. Drying the soil until the perched water table reached 15 cm below the soil surface (same severity as in the "Safe Alternate Wetting and Drying"), which in this study corresponded to a soil (0-15 cm) water potential of ~0, did not decrease grain As concentrations, regardless of timing. Drying the soil to Medium Severity [MS: soil (0-15 cm) water potential of -71 kPa] or High Severity [HS: soil (0-15 cm) water potential of -154 kPa] decreased total As by 41-61%. However, inorganic As did not always decrease because the severity and the timing of soil drying affected As speciation within the grain. Overall, the soil had to be dried to...Continue Reading

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Citations

May 28, 2019·Environmental Science and Pollution Research International·Fabio GosettiEmilio Marengo
Nov 23, 2020·Journal of Environmental Management·Supriya Majumder, Pabitra Banik
Feb 12, 2021·Frontiers in Plant Science·Cristina P Fernández-BacaJinyoung Y Barnaby
Feb 14, 2021·The Science of the Total Environment·Muhammad Mahroz HussainHua Zhang
May 1, 2021·International Journal of Environmental Research and Public Health·Supriya MajumderPabitra Banik
Jun 11, 2021·Bulletin of Environmental Contamination and Toxicology·Longyong LinYirong Deng

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