Fate of irrigation-water arsenic in rice soils of Bangladesh

Autor:	M. Rafiqul Islam, G. M. Panaullah, M. Asaduzzaman Khan, M. Jahiruddin, John M. Duxbury, Richard H. Loeppert
Rok vydání:	2009
Předmět:	Irrigation biology food and beverages Soil Science Plant Science Straw Upland rice Oryza biology.organism_classification Agronomy Soil water Environmental science Paddy field Poaceae Leaching (agriculture)
Zdroj:	Plant and Soil. 322:263-277
ISSN:	1573-5036 0032-079X
DOI:	10.1007/s11104-009-9914-3
Popis:	An experiment involving four soils and three irrigation-water As concentrations was conducted in undisturbed soil columns during 2004–2006, with Boro (winter dry-season, flood-irrigated rice, using As-contaminated water for irrigation), T. Aman (summer monsoon, rain-fed flooded rice), Boro, and T. Aman rice grown in sequence, to examine the fate of added As from irrigation water during flooded rice culture. The As content in the column leachate represented only 1.17–5.08% of the total applied As, indicating the substantial build-up of soil As. Most of the irrigation-applied As remained in the zone of maximum root activity at the top 0–15 cm of soil. Increased As concentrations in soil from the application of As-contaminated water resulted in substantially reduced rice-grain yields and increased As concentrations in rice grain and straw, indicating the potential hazards of continued irrigation with As-contaminated water to sustainable rice production and food security in South Asia.
Databáze:	OpenAIRE
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