Your search found 2 records
1 Ladha, J. K.; Hill, J. E.; Duxbury, J. M.; Gupta, R. K.; Buresh, R. J. (Eds.) 2003. Improving the productivity and sustainability of rice-wheat systems: Issues and impacts. Madison, WI, USA: American Society of Agronomy; Crop Science Society of America; Soil Science Society of America. xix, 231p. (ASA special publication no.65)
Rice ; Wheat ; Paddy fields ; Cropping systems ; Productivity ; Sustainability ; Environmental effects ; Soil properties ; Puddling ; Farmers’ attitudes / Asia / South Asia / India / Pakistan / China / Punjab / Indo-Gangetic Plain
(Location: IWMI-HQ Call no: 633.18 G570 LAD Record No: H035871)
Proceedings of an international symposium cosponsored by Division A-6 (International Agronomy), IRRI and CIMMYT, held at the 2001 Annual Meetings of the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Charlotte, NC, 22 Oct. 2001
2 Duxbury, J. M.; Panaullah, G. M.; Zavala, Y. J. 2009. Impact of use of As-contaminated groundwater on soil As content and paddy rice production in Bangladesh. Taipei, Taiwan: Food and Fertilizer Technology Center (FFTC). 11p. (Food and Fertilizer Technology Center (FFTC) Technical Bulletin 180)
(Location: IWMI HQ Call no: P 8098 Record No: H044560)
(0.25 MB)
Arsenic (As) contamination of irrigation water and soils of Bangladesh was found to be highly variable at scales from the command area of a tubewell to nationwide. Spatial pattern in soil As at the command area scale was created as irrigation water was rapidly oxygenated and As adsorbed on precipitated ferric hydroxides. Complex relationships between irrigation water and soil As levels were found in an study of 5 upazilla. At the national scale, soil As was elevated in the Gangetic floodplain indicating deposition of As contaminated sediments from this river. The pattern of soil As concentrations was very different from that for irrigation water, which matched the published pattern for household tubewells. Arsenic was shown to be phytotoxic to all tested rice varieties in a farmer command area where there was a soil As gradient from 11-67 mg kg-1. Production of rice in a more aerobic environment on raised beds was able to substantially prevent phytotoxicity. Rice from the national and Upazilla surveys was found to be elevated in As compared to a global “normal” range for As in rice. Raised bed production reduced As concentrations in rice straw and grain to 15-30% and 0-50%, respectively, of the values found with conventional paddy production. With increasing grain arsenic levels, rice from Bangladesh contained primarily inorganic As species, whereas rice from the USA increasingly contained dimethyl arsinic acid which is considered to be much less toxic to humans than inorganic As. At Bangladesh rice consumption rates, almost all Bangladesh rice would provide more inorganic As to adults than that allowed by the WHO drinking water standard of 10 µg L-1 and comparable amounts to that allowed by the Bangladesh drinking water standard of 50 µg L-1.
Powered by DB/Text WebPublisher, from
