Effect of water regimes and organic matters on transport of arsenic insummer rice (Oryza sativa L.)
Sefaur Rahaman , Ashim Chandra Sinha , Dibyendu Mukhopadhyay
DOI:
Received May 04, 2010,Revised October 12, 2010, Accepted , Available online
Volume 23,2011,Pages 633-639
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The arsenic contamination in soil-water-plant systems is a major concern of where, the groundwater is being contaminated with
arsenic (above 0.01 mg/L) in the Indian subcontinent. The study was conducted with organic matter to find out the reducing e ect on
arsenic load to rice (cv. Khitish). It was observed that intermittent ponding reduced arsenic uptake (23.33% in root, 13.84% in shoot and
19.84% in leaf) at panicle initiation stage, instead of continuous ponding. A decreasing trend of arsenic accumulation (root > straw >
husk > whole grain > milled grain) was observed in di erent plant parts at harvest. Combined applications of lathyrus + vermicompost
+ poultry manure reduced arsenic transport in plant parts (root, straw, husk, whole grains and milled grain) which was significantly at
par (p > 0.05) with chopped rice straw (5 tons/ha ) + lathyrus green manuring (5 tons/ha) in comparison to control and corresponding
soils. A significant negative correlation of arsenic with phosphorus (grain P with arsenic in di erent parts R2= 0.627–0.726 at p >
0.01) was observed. Similarly, soil arsenic had a negative correlation with soil available phosphorus (R2 = 0.822 at p > 0.001) followed
by soil nitrogen (R2= 0.762 at p > 0.01) and soil potassium (R2 = 0.626 at p > 0.01). Hence, e ective management of contaminated
irrigation water along with organic matter could reduce the arsenic build up to plants and soil.
