Interactive effects of selenium and phosphorus on arsenic availability in soils and its uptake by rice
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
In Punjab, exposure of rice fields to arsenic through groundwater irrigation may lead to As
accumulation in soil and increase the possibility of its uptake in rice crop. A screen house
experiment was conducted at Department of Soil Science, PAU, Ludhiana to evaluate the
effects of incorporation of selenium (Se) enriched mustard biomass (0, 0.05 and 0.10 mg kg-1)
grown ex-situ and phosphate fertilization (0, 60 and 120 mg kg-1) on arsenic content and its
uptake by rice plants irrigated with water containing different concentrations of arsenic (0,
2.5, 5.0 and 10 µM As L-1). Irrigating rice with water containing As higher than 5 µM As L-1
resulted in significant increase in As content and its uptake by rice grain, straw and root parts
and eventually decreased the grain yield (from 15.7 g pot-1 in control to 13.1 g pot-1 by
irrigation with water containing 10 µM As L-1). Application of Se @ 0.10 mg kg-1 helped in
increasing the yield, retarded As accumulation and uptake by rice. Application of P @ 60 and
120 mg kg-1 along with As addition through irrigation water increased As uptake in rice and
eventually decreased the grain yield. Sequential extraction of different As fractions from soil
samples, collected after harvesting rice, showed that application of Se decreased proportion of
total arsenic in the available forms of As in comparison to non-available forms of As in soil,
whereas, P application increased the proportion of available forms of As.