Arsenic Management in Contaminated Irrigation Water for Rice Cultivation
2016
Hasan Z. | Naher U. A. | Rahman M. S. | Panhwar Q. A. | Shah A. L. | Shamshuddin J. | Islam S. M. M.
Arsenic (As) contaminated irrigation water (groundwater) is a threat to irrigated ricecultivation. Studies were conducted during three consecutive Boro seasons (fully dependenton irrigation) at highly As contaminated areas in Bangladesh to determine a suitablewater management practice to reduce As accumulation in rice. In this study, two watermanagement techniques were evaluated: 1) alternate wetting and drying (AWD) andcontinuous standing water (CSW) with surface (25 µg L-1 As); and 2) groundwater (419µg L-1 As). A high yielding rice variety, BRRI dhan28, was grown. Results showed thatthe yield obtained by two management techniques were almost similar, except in CSWwith groundwater application where significant yield reduction was observed. Significantlylower As content was found in the straw (77.23%) and rice grain (38.14%) of AWDwith groundwater and CSW (straw 70.41% and 26.36%) with surface water applicationcompared to CSW with ground water application. Among the water management practices,AWD with groundwater application showed similar benefit to CSW with surface waterirrigation. Thus, alternate wetting and drying (AWD) with groundwater or surface waterirrigation with CSW can be advocatedas an appropriate agronomic practice forrice cultivated in As contaminated soils ofBangladesh
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